This manual is designed to provide step by step
instructions for brake component replacement.
Examine the brake carefully during disassembly
to check for worn components and unusual wear
patterns. Any worn parts should be replaced to
assure normal, safe performance. Repair parts to
be used for servicing the 12-1/4'' x 3-1/2'' brake
are packaged in kits at the factory. Each kit supplies components to service a specific portion
around this kit concept. Call Warner Electric at
800-234-3369 or www.warnerelectric.com for a
complete list of Warner Electric authorized
distributors.
Failure to follow these
instructions may result in product damage,
equipment damage, and serious or fatal injury
to personnel.
Spring Kit
2-1Shoe Assembly2–Shoe Assemblies
2-2Hold Down Spring Cup2–Hold Down Springs
2-3Hold Down Pin2–Hold Own Pins
2-4Hold Down Springs4–Hold Down Spring Cups
2-5Spherical Washer2–Spherical Washers
2-6“X” Washer Retainer2–“X” Washer Retainers
3Adjuster/Adjuster Spring Kit1301-100-0061–Adjuster Assembly1
3-1Adjuster Sleeve1–Adjuster Plug
3-2Screw1–Adjuster Spring
3-3Nut2–“X” Washer Retainers
3-4Adjuster Plug
3-5Adjuster Spring
2-6“X” Washer Retainer
9Shoe Hold Down Spring Kit1301-100-0071
2-2Hold Down Springs2–Hold Down Springs
2-3Hold Down Pin2–Hold Down Pins
2-4Hold Down Spring Cup4–Hold Down Spring Cups
2-5Spherical Washer2–Spherical Washers
2-6“X” Washer Retainer2–“X” Washer Retainers
Warner Electric • 800-825-9050819-0209
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Parts Replacement Instructions
equipped with.
For ease of service, remove the brake from the
axle prior to disassembly. To replace a particular
kit, disassemble the brake only to the level at
which the new kit items can be installed, and
then reassemble. Refer to the exploded view on
page 2 to identify the reference numbers in the
text.
Replacing The Magnet
Kit No. 1301-100-014
See Page 3 for kit description
General Instructions
1. Refer to Figures 1 and 2 to determine which
style magnets your brakes are now
2. Refer to Figures 3 and 4 to determine which
Figure 3 - New Lever Arm
Figure 1 - New-style Long-life magnet
Figure 2 - Old-Style Dual magnets
Figure 4 - Old Lever Arm
style magnet arm your brakes are now
equipped with.
3. Refer to the proper instructions in the manual regarding the specific replacement of
parts.
Note: New style, single, long-life magnet can
be used with either the old or new arm. Old
style, dual magnets will work only with old
style magnet arm. Do not use dual magnets
with new style magnet arm.
Figure 5 - Wire Guide Spring
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Warner Electric • 800-825-9050819-0209
Page 5
Note: Wire guide spring is used only when
replacing single magnet on old style magnet
lever arm. (Figure 5).
Brakes must be road tested and new magnet(s) must be burnished after installation.
See “Road Test and Burnish Procedure,”
page 25.
4. Note wire routing on magnet lever arm (5-1).
Mark the exact position of the wire clips (1-2)
with a grease pencil, and remove the lead
wires from the clips on the arm. Leave the
clips in place.
5. Remove the used magnet (1-1) from the lever
arm (5-1) and discard magnet.
Case I: Replacing Single Magnet on New
Figure 6 - Removing Shoe Return Springs
Style Magnet Arm with New Single Magnet
1. Remove the two shoe return springs (4-1),
using a brake spring tool. (See Figure 6).
2. Remove the anchor pin plate (4-2) and
spread the shoe (2-1) apart, exposing the
6. Replace the used magnet springs (1-3) with
new ones provided. Note small diameter end
of springs set on the magnet lever arm (5-1).
7. With the magnet lever arm (5-1) positioned so
the square cam is away from you, install the
new single magnet on the pins so that the
wires are located at the upper right hand side
of the magnet. (The label on the new magnet
also explains the magnet mounting method).
8. Replace the five old wire clips (1-2) on the
magnet lever arm (5-1) with new clips. Install
Figure 8 - Wire Routing and Magnet Position
the clips in the same location as marked during disassembly (Step 4).
Route the magnet lead wires individually
Figure 7 - Removing Internal Nuts
brake terminal (6).
3. Remove the two internal nuts (6-1) which
secure the magnet lead wires to the terminal
Figure 9 - R.H. Brakes
posts (6-3). (See Figure 7).
Warner Electric • 800-825-9050819-0209
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Page 6
through the five clips on the arm, duplicating the routing noted in Step 4. (See Figure
8).
Figure 10 - L.H. Brakes
tract properly and are in correct adjustment.
13. Reassemble the drum and wheel. Make
sure wheel bearings and wheel nuts are
On right-hand brakes allow 2-3/8-inches of
wire between the magnet and the first clip.
(See Figure 9).
On-left hand brakes allow 3-1/8-inches of
wire between the magnet and first clip.
(See Figure 10).
Allowing this much wire prevents strain on
the wire when the magnet is pulled out the
maximum distance.
9. Assemble the magnet lead wire terminals
onto the terminal posts (6-3) in the following
sequence.
a. Place one internal lockwasher over each
post.
b. Place one wire terminal over each post.
c. Place one internal nut (6-1) over each post
and tighten them to 30-40 in. lb. torque.
10. Close the shoe (2-1) that was spread to
expose the terminal, and install the anchor
pin plate (4-2).
11. Install the shoe return springs (4-1) using a
brake spring tool.
12. Check to be sure shoes expand and con-
Figure 11 - Removing Shoe Return Springs
adjusted to axle manufacturer’s specifications.
Case II: Replacing Long-Life Magnet on Old
Style Arm with New Long-Life Magnet
1. Remove the two shoe return springs (4-1),
Figure 12 - Removing Internal Nuts
using a brake spring tool. (See Figure 11).
2. Remove the anchor pin plate (4-2) and
spread the shoe (2-1) apart, exposing the
brake terminal assembly (6).
6
Warner Electric • 800-825-9050819-0209
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3. Remove the two internal nuts (6-1) which
secure the magnet lead wires to the terminal
posts (6-3). (See Figure 12).
Figure 13 - Wire Guide Spring
4. Note the wire routing on the magnet lever
arm (5-1). Mark the exact position of the
wire clips (1-2) with a grease pencil and
remove the lead wires from the clips on the
arm. Leave the clips in place.
5. Note how the wire guide spring is assembled and remove it from the magnet lever
arm (5-1). (See Figure 13). Discard the
spring.
6. Remove the used magnet (1-1) from the
lever arm (5-1) and discard the magnet.
7. Replace the used magnet springs (1-3) with
the new springs provided. Note that the
small diameter end of springs are set on the
magnet lever arm (5-1).
so the square cam is away from you, install
the new long-life magnet on the pins. The
wires must be located at the upper righthand side of the magnet.
9. Install the new wire guide spring on the
wires. Then installed the spring into the “V”
on the magnet lever arm (5-1) exactly like
the old spring was mounted. One spring
end is hooked into each square tang hole in
the top plate of the arm. (See Figure 14).
10. Replace the five old wire clips (1-2) on the
Figure 15 - R.H. Brake
magnet lever arm (5-1) with new clips.
Install the clips in the same locations as
marked during the disassembly (Step 4).
8. With the magnet lever arm (5-1) positioned
Figure 16 - L.H. Brake
Route the magnet lead wires individually
through the five clips on the arm, duplicating the routing noted in Step 4 above.
(See Figure 14).
Figure 14 - Installing Wire Guide Spring
Warner Electric • 800-825-9050819-0209
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On right-hand brakes allow 2-3/8-inches of
wire between the magnet and first clip.
(See Figure 15).
On left-hand brakes allow 3-1/8-inches of
wire between the magnet and first clip.
(See Figure 16).
Allowing this much wire prevents strain on
the wire when the magnet is pulled out the
maximum distance.
11. Assemble the magnet lead wire terminals
onto the terminal posts (6-3) in the following sequence:
a. Place one internal lockwasher over each
post.
can stick in their expanded position. To
correct this, merely push the shoe back
into position. Once the shoe drum has
been installed, the shoe will be restricted
from expanding far enough to stick.
b. Place one wire terminal over each post.
c. Place one internal nut over each post
and tighten them to 30-40 in.-lb. torque.
12. Close the shoe (2-1) that was spread to
expose the terminal and install the anchor
pin plate (4-2).
13. Install the shoe return springs (4-1), using a
brake spring tool.
14. Move the magnet lever arm along its track
to insure that the shoes expand and contract properly and are in correct adjustment. When making this test, the shoes
Figure 17 - Removing Shoe Return Springs
15. Reassemble the drum and wheel. Make
sure wheel bearings and wheel nuts are
adjusted to axle manufacturer’s specifications.
Case III: Replacing Dual Magnets on Old
Style Magnet Arm with New Single Magnet
Figure 18 - Removing Internal Nuts
1. Remove the two shoe return springs (4-1),
using a brake spring tool. (See Figure 17).
2. Remove the anchor pin plate (4-2) and
spread the shoe (2-1) apart, exposing the
brake terminal assembly (6).
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3. Remove the two internal nuts (6-1) which
secure the magnet lead wires to the terminal
posts (6-3). (See Figure 18).
Figure 19 - Wire Guide Spring
4. Note wire routing on magnet lever arm (5-1).
Mark the exact position of the wire clips (1-
2) with a grease pencil, and remove the lead
wires from the clips on the arm. Leave the
clips in place.
5. Note how the wire guide spring is assembled and remove it from the magnet lever
arm (5-1). (See Figure 19). Discard the
spring.
wires must be located at the upper right hand
side of the magnet. (The label on the new
magnet also explains the magnet mounting
method).
9. Install the new wire guide spring on the wires.
Then install the spring into the “V” on the
magnet lever arm (5-1) exactly like the old
Figure 21 - Wire Routing
spring was mounted. One spring end is
hooked into each square tang hole in the top
plate of the arm. (See Figure 20).
6. Remove the two used magnets from the
lever arm (5-1) by pulling them off the magnet pins. Be careful not to bend the magnet
arm. Discard the magnets.
7. Replace the used magnet springs (1-3) with
the new ones provided. Note that the small
diameter end of the springs are set on the
magnet lever arm (5-1).
8. With the magnet lever arm (5-1) positioned
so the square cam is away from you, install
the new long-life magnet on the pins. The
Figure 22 - R.H. Brake
10. Replace the five old wire clips (1-2) on the
magnet lever arm (5-1) with new clips. Install
the clips in the same locations as marked
Figure 22 A - L.H. Brake
Figure 20 - Installing Wire Guide Spring
Warner Electric • 800-825-9050819-0209
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during the disassembly (Step 4).
Route the magnet lead wires individually
through the five clips on the arm, duplicating the routing noted in Step 4. (See Figure
21).
On right-hand brakes allow 2-3/8-inches of
wire between the magnet and the first clip.
(See Figure 22).
to insure that the shoes expand and contract properly and are in the correct
adjustment. When making this test, the
shoes can stick in their expanded position. To correct this, merely push the shoe
back into position. Once the shoe drum
has been installed, the shoe will be
restricted from expanding far enough to
stick.
On left-hand brakes allow 3-1/8-inches of
wire between the magnet and the first clip.
(See Figure 22 A).
Allowing this much wire prevents strain on
the wires when the magnet is pulled out
the maximum distance.
11. Assemble magnet lead wire terminals onto
terminal posts (6-3) in the following
sequence:
a. Place one internal lockwasher over each
post.
b. Place one wire terminal over each post.
c. Place one internal nut (6-1) over each
post and tighten them to 30-40 in. lbs.
torque.
12. Close the shoe (2-1) that was spread to
expose the terminal and install the anchor
pin plate (4-2).
13. Install the shoe return springs (4-1), using a
brake spring tool.
14. Move the magnet lever arm along its track
15. Reassemble the drum and wheel. Make
sure wheel bearings and wheel nuts are
adjusted to axle manufacturer’s specifications.
Replacing Shoes and Linings/Shoe Hold
Down Springs
Figure 23 - Removing Shoe Return Springs
Kit No. 1301-100-005
See Page 3 for kit description
Note: Shoes are interchangeable so there
is no concern regarding right or left hand
during assembly. Brake drums must be
resurfaced or replaced when brake shoes
are replaced to assure proper break-in and
performance.
Brakes must be road tested and new linings worn in after installation. See “Road
Test and Burnish Procedure,” page 25.
1. Remove the two shoe return springs (4-1)
using a brake spring tool. (See Figure 23).
2. Remove the anchor pin plate (4-2).
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Style B: Style B uses an “X” washer retainer
(2-6) to lock the spring assembly in place.
The “X” washer retainer should only be
used once. If it is removed during repairs,
discard it and use the new ones provided in
the kit.
Depress the spring assembly and remove it,
being sure to discard the old “X” washer
retainer (2-6). (See Figure 25).
Figure 24 - Style A Shoe Hold Down Assy’s
3. Remove the two shoe hold down spring
assemblies (2-2, 2-3, 2-4, 2-5, and 2-6).
There are two assembly configurations.
Follow the instructions for either Style A or
Style B.
These assemblies are
spring loaded. Wear safety glasses while
performing these operations and keep
your head away from the parts being
removed. Follow the instructions carefully.
Style A (old style): Style A uses a slotted,
4. Remove the two shoes (2-1), the adjuster
Figure 26 - Lubrication Points
(3-1, 3-2, and 3-3) and the adjuster spring
(3-5) as an assembly by spreading the
shoes apart at the top and lifting them off.
Disassemble and discard the old shoes (2-
1). Save the adjuster spring (3-5) and the
adjuster (3-1, 3-2, and 3-3).
Figure 25 - Style B Shoe Hold Downs
dished washer with a swaged pin to lock
the spring assembly in place.
(See Figure 24).
Figure 27 - Adjuster Assembly
Depress the washer/spring assembly and
rotate the top washer 90°.
Slowly relax the spring and disassemble.
Warner Electric • 800-825-9050819-0209
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5. Note: This step pertains only to brakes
using Style “A” shoe hold down assemblies.
Discard all old pins, rubber washers, spring
cups, and old springs. Drill out the two hold
down pin clearance holes in the backing
plate with a 5/16-inch (.312-inch) dia. drill.
6. Lubricate the six shoe pads on the backing
plate with “moly” impregnated grease. (See
Figure 26).
7. Assemble the two new shoes (2-1), adjuster
spring (3-5), and adjuster (3-1, 3-2, and 3-
3). Make sure the adjuster is fitted into the
notches in the shoe web. Install the assembly onto the brake. (See Figure 27).
8.To facilitate the installation of the new style
shoe hold down assemblies, rotate either
shoe (2-1) away from the anchor pin so that
the shoe slides off the shoe pad and onto
the curl of the backing plate. This procedure will minimize the hold down spring
compression required.
the backing plate with a heavy screwdriver.
Rotate it into the place against the anchor
pin.
Figure 28 - Brake Adjustment
13. Repeat Steps 8 through 12 for the second
shoe hold down assembly.
14. Install the anchor pin plate (4-2).
15. Install the shoe return springs (4-1), using a
brake spring tool.
9.Insert a hold down pin (2-3) through the
hole in the rear of the backing plate and the
hole in the shoe (2-1) web. Hold pin in
place.
10. Place a spring cup (2-4), convex upward,
over the pin. Next install the spring (2-2), a
spring cub (2-4) (convex downward), and
then a spherical washer (2-5) (it nests in the
spring cup) over the protruding pin (2-3).
11. Slide a new “X” washer retainer (2-6)
between the head of the pin (2-3) and the
spherical washer (2-5) while compressing
the assembly. Using pliers, close the “X”
washer retainer to lock on the pin.
12. Lift the shoe (2-1) onto the shoe pads on
16. Check that the shoes expand and contract
properly. Set the shoes to the fully contracted position before installing the drums.
17. Reassemble the drums and wheels. Make
sure the wheel bearings and wheel nuts are
adjusted to the axle manufacturer’s specifications.
18. Brake Adjustment: Remove the rubber
adjuster plug (3-4) and insert an adjusting
tool. (See Figure 28).
With the wheel off the ground, expand the
shoes until the brake drags significantly.
(Upward motion of the tool turns the
adjusting nut, 3-3, to expand the shoes
against the drum.)
Then back off the adjuster (downward
motion) until the wheel turns freely, usually
10 to 12 notches.
After the initial 500 miles of operation
(when the new shoes and drum have been
seated), brake readjustment is recommended.
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Replacing the Adjuster/Adjuster Spring
rotate the top washer 90°.
Kit No. 1301-100-006
See page 3 for kit description.
1. Remove the two shoe returns springs (4-1)
with a brake spring tool. (See Figure 29).
Figure 29 - Remove Shoe Return Springs
2. Remove the anchor pin plate (4-2).
3. Remove the two shoe hold down spring
assemblies (2-2, 2-3, 2-4, 2-5, and 2-6).
There are two assembly configurations.
Follow the instructions for either Style A or
Style B.
Slowly relax the spring and disassemble.
Style B: Style B uses an “X” washer retainer
(2-6) to lock the spring assembly in place.
The “X” washer retainer should only be
used once. If it is removed during repairs,
discard it and use the new ones provided in
the kit.
Depress the spring assembly, and using a
pliers, squeeze the ears of the “X” washer
retainer together to open it.
Then relax the spring assembly and remove
it, being sure to discard the old “X” washer
retainer. (2-6). (See Figure 31).
4. Remove the two shoes (2-1), the adjuster
These assemblies are spring
loaded. Wear safety glasses while
performing these operations, and keep
your head away from the parts being
removed. Follow the instructions
carefully.
Style A (old style): Style A uses a slotted,
dished washer with a swaged pin to lock
the spring assembly in place. (See Figure
30).
Depress the washer/spring assembly and
(Style A)
(Style B)
Figure 31 - Removing Style B Shoe Hold
Down Assemblies
(3-1, 3-2, and 3-3) and the adjuster spring
(3-5) as an assembly by spreading the
shoes apart at the top and lifting off.
Disassemble and discard the old adjuster
(3-1, 3-2, and 3-3) and the old adjuster
spring (3-5).
5. Lubricate the six shoe pads on the backing
plate with “moly” impregnated grease. (See
Figure 32).
Figure 30 - Removing Shoe Hold Down
Assemblies (Style A)
Warner Electric • 800-825-9050819-0209
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Figure 32 - Lubricating Shoe Pads
6. Assemble the two shoes (2-1), new adjuster
spring (3-5) and new adjuster (3-1, 3-2, and
3-3). Make sure the adjuster is fitted into the
notches in the shoe web. (See Figure 33).
Style A (old style): Insert the pin (with the
rubber washer on its head) through the rear
of the backing plate and through the hole in
the shoe web.
Place a dished washer, the spring, and
another dished washer over the pin end.
Compress the spring assembly below the
swaged end of the pin. Rotate the top
washer 90° to lock the assembly into place.
Style B (new style): Insert a hold down pin
(2-3) through the hole in the rear of the
backing plate and through the hole in the
shoe web (2-1). Hold the pin in place.
Place a spring cup (2-4), convex upward,
over the pin. Next install the spring (2-2), a
spring cup (2-4) convex downward, and
then a spherical washer (2-5) over the protruding pin (2-3). The spherical washer
nests in the spring cup.
7.Reinstall the two shoes (2-1), the adjuster
(3-1, 3-2, and 3-3) and the adjuster spring
(3-5) as a complete assembly. The adjuster
nut (3-3) must be positioned over the brake
adjustment access hole in the backing
plate.
8.Replace the rubber adjuster plug (3-4) from
the backside of the brake.
9.To facilitate the installation of the shoe hold
down assemblies, rotate either shoe (2-1)
away from the anchor pin so that the shoe
slides off the shoe pad and onto the curl of
the backing plate. This procedure will minimize the hold down spring compression
required.
10. As noted in Step 3, there are two shoe hold
down assembly configurations. Follow the
instructions for Style A or Style B to install
the shoe hold down assemblies.
Slide a new “X” washer retainer (2-6)
between the head of the pin (2-3) and the
spherical washer (2-5) while compressing
the assembly. Using pliers, close the “X”
retainer to lock on the pin.
11. Lift the shoe (2-1) onto the shoe pads on
the backing plate with a heavy screw driver.
Rotate it into place against the anchor pin.
12. Repeat steps 9 through 11 for the second
shoe hold down assembly.
13. Install anchor pin plate (4-2).
14. Install shoe return springs (4-1) using a
brake spring tool.
15. Check that shoes expand and contract
properly and are in correct adjustment.
16. Reassemble drums and wheels. Make sure
wheel bearings and wheel nuts are adjusted to axle manufacturer’s specifications.
17. Brake Adjustment
Remove the rubber adjuster plug (3-4), and
insert an adjusting tool. (See Figure 34).
With the wheel off the ground, expand the
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Page 15
Figure 34 - Brake Adjustment
shoes until the brake drops significantly.
(Upward motion of the tool turns the adjusting nut, 3-3, to expand the shoes against
the drum).
The back off the adjuster (downward
motion) until the wheel turns freely, usually
10 to 12 notches.
After the initial 500 miles of operation (when
the new shoes and drum have been seated),
brake readjustment is recommended.
1. Remove the two shoe return springs (4-1)
using a brake spring tool and discard them.
(See Figure 35).
2. Replace the anchor pin plate (4-2) with the
new one provided.
3. Install new return springs (4-1) using a brake
Figure 35 - Removing Shoe Return Springs
spring tool.
4. Check that shoes expand and contract
properly and are in correct adjustment.
Replacing Shoe Return Springs
Kit No. 1301-100-008
See page 3 for kit description
Warner Electric • 800-825-9050819-0209
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Page 16
Replacing Lever Arm Assembly
Kit No. 1301-100-015 (R.H.) or
1301-100-016 (L.H.)
See page 3 for kit description
Case I: Replacing Old Style Lever Arm with
New Style Lever Arm
Note: Old-style dual magnets must be
replaced with new style long-life magnet.
Referring to Figures 36 and 37 determine which
style magnet arm your brakes are equipped
with.
Figure 36 - Old-Style Lever Arm
1. Remove the two shoe return springs (4-1)
using a brake spring tool. (See Figure 35).
2. Remove the anchor pin plate (4-2).
3. Remove the two shoe hold down spring
assemblies (2-2, 2-3, 2-4, 2-5, and 2-6).
There are two assembly configurations.
Follow the instructions for either Style A or
Style B.
These assemblies are
spring loaded. Wear safety glasses while
performing these operations and keep
your head away from the parts being
removed. Follow instructions carefully.
Style A (old style): Style A uses a slotted,
dished washer with a swaged pin to lock
spring assembly in place. (See Figure 38).
Figure 37 - New-Style Lever Arm
(Style A)
(Style B)
Figure 38 - Removing Shoe Hold Down
Note: The new style magnet arm will work only
Assemblies (Style A)
with the new style long-life magnet. Do not use
old style, dual magnets with new style magnet
arm.
Depress the washer/spring assembly and
rotate the top washer 90°.
Slowly relax the spring and disassemble.
Style B: Style B uses an “X” washer retainer
(2-6) to lock the spring assembly in place.
The “X” washer retainer should only be
used once. If it is removed during repairs,
discard it and use the new ones provided in
the kit.
Depress the spring assembly, and using a
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Warner Electric • 800-825-9050819-0209
Page 17
pliers, squeeze the ears of the “X” washer
retainer together to open it.
Then relax the spring assembly and remove
it, being sure to discard the old “X” washer
retainer (2-6). (See Figure 39).
Figure 39 - Removing Shoe Hold Down
Assemblies (Style B)
Figure 40 - Removing Internal Nuts
4. Remove the old shoes (2-1), the adjuster (31, 3-2, and 3-3) and the adjuster spring (3-5)
as an assembly by spreading the shoes
apart at the top and lifting off.
5. Remove the two internal nuts (6-1) which
secure the magnet lead wires to the terminal
posts (6-3). (See Figure 40). Remove the
magnet arm assembly (5-1) by pulling it
straight off the pivot screw (5-2). (See
Figure 41).
Figure 41 - Removing Magnet Arm Assembly
6. Remove the old pivot screws (5-2) from the
backing plate as follows: (See Figure 42).
Figure 42 - Removing Pivot Screws
a. Turn the backing plate over.
b. Strike the threaded end of the screw
with a hammer to drive it out.
Warner Electric • 800-825-9050819-0209
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Page 18
7. Install the new pivot screw as follows:
a. Line up the serrations under the screw
head with the grooves in the backing
plate hole.
b. Draw the screw down with a nut and
washer by tightening the nut until the
screw head bottom is on the backing
plate.
c. Remove the nut washer.
8. Note wire routing on old magnet lever arm
(5-1). Remove the lead wires from the clips
(1-2) on the arm, leaving the clips in place.
Transfer these clips to the new lever arm,
making sure they are in the same position.
9. Remove the wire guide spring from the
magnet lever arm and the wires. Discard the
spring. (The wire guide spring is not needed
with the new style magnet lever arm.) (See
on the new arm.
11. Route the magnet lead wires individually
through the five clips (1-2) on the arm.
Figure 44 - Wire Routing & Magnet Position
Duplicate the wiring noted in Step 8 above.
(See Figure 44).
Figure 43 - Old Wire Guide Spring
Figure 43).
10. Remove the magnet or magnets from the
used lever arm. Install the single, long-life
magnet in the same manner and location
Figure 45 - R.H. Brakes
On right-hand brakes allow 2-3/8-inches of
wire between the magnet and the first clip.
(See Figure 45).
Figure 46 - L.H. Brakes
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Warner Electric • 800-825-9050819-0209
Page 19
On left-hand brakes allow 3-1/8-inches of
wire between magnet and the first clip.
(See Figure 46).
Allowing this much wire prevents strain on
the wires when the magnet is pulled out the
maximum distance.
12. Lubricate the following with “moly” impregnated grease:
Lever arm pivot screw (5-2).
Lever arm (5-1)–flat area around pivot
screw bushing, both sides.
Lever arm “feet”, both sides (5-1).
c. Place one internal nut (6-1) over each post
and tighten them to 30-40 in. lb. torque.
15. Reinstall the two shoes (2-1); the adjuster (31, 3-2, and 3-3) and the adjuster spring (3-5)
as a complete assembly.
16. To facilitate the installation of the shoe hold
down assemblies, rotate either shoe (2-1)
away from the anchor pin so that the shoe
slides off the shoe pad and onto the curl of
the backing plate. This procedure will minimize the hold down spring compression
required.
17. As noted in Step 3, there are two shoe hold
down assembly configurations. Follow the
instructions for Style A or Style B to install
the shoe hold down assemblies.
Style A (old style): Insert the pin (with the
rubber washer on its head) through the rear
of the backing plate and through the hole in
the shoe web.
Figure 47 - Lubrication Points
Feet guide area of backing plate.
Six shoe pads on braking plate.
(See Figure 47) “Lubrication Points”
13. Reassemble magnet arm (5-1) over pivot
screw (5-2) making sure magnet arm “feet”
slide in guide on backing plate.
14. Assemble the magnet lead wire terminals
onto the terminal posts (6-3) in the following sequence.
a. Place one internal lockwasher over each
post.
Place a dished washer, the spring, and
another dished washer over the pin end.
Compress the spring assembly below the
swaged end of the pin. Rotate the top washer
90° to lock the assembly into place.
Repeat these steps for the second shoe hold
down assembly.
Style B (new style): Insert a hold down pin
(2-3) through the hole in the rear of the
backing plate and through the hole in the
shoe web (2-1). Hold the pin in place.
Place a spring cup (2-4), convex upward,
over the pin. Next install the spring (2-2), a
spring cup (2-4) convex downward, and then
a spherical washer (2-5) over the protruding
pin (2-3). The spherical washer nests in the
spring cup.
Slide a new “X” washer retainer (2-6) between
the head of the pin (2-3) and the spherical
b. Place one wire terminal over each post.
Warner Electric • 800-825-9050819-0209
19
Page 20
washer (2-5 while compressing the assembly. Using pliers, close the “X” retainer to
lock on the pin.
Repeat these steps for the second
assembly.
18. Lift the shoes (2-1) onto the shoe pads on
the backing plate with a heavy screwdriver.
Rotate them into place against the anchor
pin.
19. Install the anchor pin plate (4-2).
20. Install the shoe return springs (4-1) using a
brake spring tool.
21. Move the magnet lever arm along its track
to ensure that the shoes expand and contract properly and are in the correct adjustment. When making this test, the shoes
can stick in their expanded position. To
correct this, merely push the shoe back
into position. Once the shoe drum has
been installed, the shoe will be restricted
from expanding far enough to stick.
location on the new arm.
10. Route the magnet lead wires individually
through the five clips (1-2) on the arm.
Figure 48 - Wire Routing
Duplicate the wire routing noted in Step 7.
(See Figure 48).
22. Reassemble the drums and wheel and
make sure the wheel bearings and wheel
nuts are adjusted to axle manufacturer’s
specifications.
Case II: Replacing New-Style Lever Arm with
New-Style Lever Arm
1-8. Follow the instructions found for Case I,
page 16.
9.Remove the magnet from the used lever
arm. Install the new magnet in the same
Figure 49 - R.H. Brakes
On right-hand brakes allow 2-3/8-inches of
wire between the magnet and the first clip.
(See Figure 49).
Figure 50 - L.H. Brakes
On left-hand brakes allow 3-1/8-inches of
wire between the magnet and the first clip.
(See Figure 50).
20
Warner Electric • 800-825-9050819-0209
Page 21
Allowing this much wire prevents strain on
the wires when the magnet is pulled out the
maximum distance.
11. Lubricate the following with “moly” impregnated grease:
Lever arm pivot screw (5-2).
Lever arm (5-1)–flat area around pivot
screw bushing, both sides.
Lever arm “feet”, both sides (5-1).
torque.
14. Reinstall the two shoes (2-1), the adjuster
(3-1, 3-2, and 3-3) and the adjuster spring
(3-5) as a complete assembly.
15. Reinstall the two shoe hold down spring
assembles. To facilitate the installation of
these assemblies, rotate either shoe (2-1)
away from the anchor pin so that the shoe
slides off the shoe pad and onto the curl of
the backing plate. This procedure will minimize the hold down spring compression
required.
16. As noted in Step 3, there are two shoe hold
down assembly configurations. Follow the
instructions for Style A or Style B to install
the shoe hold down assemblies.
Style A (old style): Insert the pin (with the
rubber washer on its head) through the rear
of the backing plate and through the hole in
the shoe web.
Figure 51 - Lubrication Points
Feet guide area of backing plate.
Six shoe pads on backing plate.
Refer to Figure 51, “Lubrication Points.”
12. Reassemble the magnet arm (5-1) over the
pivot screw (5-2) making sure the magnet
arm “feet” slide into the guide on the backing plate.
13. Assemble the magnet lead wire terminals
onto the terminal posts (6-3) in the following sequence:
a. Place one internal lockwasher over each
post.
b. Place one wire terminal over each post.
c. Place one internal nut (6-1) over each
post and tighten them to 30-40 in. lbs.
Place a dished washer, the spring, and
another dished washer over the pin end.
Compress the spring assembly below the
swaged end of the pin. Rotate the top
washer 90° to lock the assembly into place.
Repeat these steps for the second shoe
hold down assembly.
Style B (new style): Insert a hold down pin
(2-3) through the hole in the rear of the
backing plate and through the hole in the
shoe web (2-1). Hold the pin in place.
Place a spring cup (2-4), convex upward,
over the pin. Next install the spring (2-2), a
spring cup (2-4) convex downward, and
then a spherical washer (2-5) over the protruding pin (2-3). The spherical washer
nests in the spring cup.
Slide a new “X” washer retainer (2-6)
between the head of the pin (2-3) and the
spherical washer (2-5) while compressing
the assembly. Using pliers, close the “X”
retainer to lock on the pin.
Repeat these steps for second assembly.
Warner Electric • 800-825-9050819-0209
21
Page 22
17. Lift the shoes (2-1) onto the shoe pads on
the backing plate with a heavy screwdriver.
Rotate them into place against the anchor
pin.
18. Install the anchor pin plate (4-2).
19. Install the shoe return springs (4-1) using a
brake spring tool
20. Move the magnet lever arm along its track
to ensure that the shoes expand and contract properly and are in the correct adjustment. When making this test, the shoes
can stick in their expanded position. To
correct this, merely push the shoe back
into position. Once the shoe drum has
been installed, the shoe will be restricted
from expanding far enough to stick.
21. Reassemble the drums and wheel and
make sure the wheel bearings and wheel
nuts are adjusted to the axle manufacturer’s specifications.
Replacing Terminal Assembly
Kit No. 1301-100-011
See page 3 for kit description
1.Remove the two shoe return springs (4-1)
using a brake spring tool. (See Figure 52).
Figure 52 - Removing Shoe Return Springs
2.Remove the anchor pin plate (4-2) and
spread the shoe (2-1) apart, exposing the
brake terminal (6).
3.Remove the two internal nuts (6-1) which
secure the magnet lead wires to the terminal
posts (6-3). (See Figure 53).
Figure 53 - Removing Internal Nuts
4.Turn the brake over and remove the nuts (6-
7), lockwashers (6-6), and flat washers (6-8)
from the two terminals (6). Slide the insulators (6-5) off the terminal posts (6-3).
Remove the molded plastic terminal (6-4)
and posts (6-3) from the top side of the
backing plate.
Install the new hardware on the backing
plate in reverse order.
22
Warner Electric • 800-825-9050819-0209
Page 23
5.Assemble the magnet lead wire terminals
onto the terminal posts (6-3) in the following sequence:
Old Style Dual Magnets
a. Place one internal lockwasher over each
post.
b. Place two black lead wire terminals over
one post.
c. Place two white lead wire terminals over
the second post.
d. Place one internal nut (6-1) over each
post and tighten them to 30-40 in. lb.
New Style Long-Life Magnet
a. Place one internal lockwasher over each
post.
b. Place one wire terminal over each post.
c. Place one internal nut (6-1) over each
post and tighten them to 30-40 in. lbs.
torque.
6.Close the shoe (2-1) that was spread to
expose the terminal and install the anchor
pin plate (4-2).
Replacing Armature
Kit No. 1301-100-013
See page 3 for kit description
1. Loosen and remove the six screws (7-2),
nuts (7-4) and lockwashers (7-3) holding the
armature (7-1) in place.
2. Remove the old armature (7-1) and thoroughly clean the drum interior.
3. Installed the new armature (7-1) with the
hardware provided in the kit. Take care to
install double jam nuts (7-4) on the armature
bolts and/or peen the bolt ends to assure
that the nuts do not loosen.
4. Reassemble the drum and wheel. Make
sure the wheel bearing and wheel nut are
adjusted to the axle manufacturer’s specifications. Repeat the process for the second
armature.
Replacing Shoe Hold Down Spring
Assemblies
Kit No. 1301-100-007
See page 3 for kit description
7.Install the shoe return springs (4-1) using a
brake spring tool.
8.Remove the two old terminal hole plugs (6-
9) from the backing plate and discard them.
Install new hole plugs in the backing plate.
Locate them in the same position, and
bend their tangs to secure them in place.
9.Check that the shoes expand and contract
properly and are in correct adjustment.
10. Reassemble the drums and wheel and
make sure the wheel bearings and wheel
nuts are adjusted to the axle manufacturer’s specifications.
Note: This kit services only brakes built after
mid-1977 that use style “B” shoe hold down
spring assemblies. This kit will not interchange
with style “A” shoe hold down spring assemblies. Refer to “Replacing Shoes and
Linings/Shoe Hold Down Springs,” kit number
1301-100-005 (page 10), for a definition of the
style “A” and style “B” kits and for instructions
for the style “A” assemblies.
1.Remove the two shoe return springs (4-1)
using a brake spring tool. (See Figure 54).
2.Remove the anchor pin plate (4-2).
3.Remove the two shoe hold down spring
assemblies (2-2, 2-3, 2-4, 2-5, and 2-6).
These assemblies are spring
loaded. Wear safety glasses while performing these operations, and keep your
head away from the parts being
removed. Follow instructions carefully.
Warner Electric • 800-825-9050819-0209
23
Page 24
6.Place a spring cup (2-4) convex upward,
over the pin. Next install the spring (2-2), a
spring cup (2-4) (convex downward), and
then a spherical washer (2-5) (it nests in the
spring cup) over the protruding pin (2-3).
7.Slide a new “X” washer retainer (2-6)
between the head of the pin (2-3) and the
spherical washer (2-5) while compressing
the assembly. Using pliers, close the “X”
washer retainer to lock on the pin.
Figure 54 - Removing Shoe Return Spring
Depress the spring assembly, and using pliers, squeeze the ears of the “X” washer
retainer (2-6) together to open it. Relax the
spring assembly and remove it.
(See Figure 55).
Figure 55 - Removing Shoe Hold
Down Assemblies
Discard the old “X” washer retainer (2-6).
Repeat this procedure for the second hold
down assembly.
8.Lift the shoe (2-1) onto the shoe pads on
the backing plate with a heavy screwdriver.
Rotate it into place against the anchor pin.
9.Repeat steps 4 through 8 for the second
shoe hold down assembly.
10. Install the anchor pin plate (4-2).
11. Install the shoe return springs (4-1) using a
brake spring tool.
12. Move the magnet lever arm along its track
to ensure that the shoes expand and contract properly and are in the correct adjustment. When making this test, the shoes
can stick in their expanded position. To
correct this, merely push the shoe back
into position. Once the shoe drum has
been installed, the shoe will be restricted
from expanding far enough to stick.
13. Reassemble the drums and wheels. Make
sure the wheel bearings and wheel nuts are
adjusted to the axle manufacturer’s specifications.
4.To facilitate the installation of the new style
shoe hold down assemblies, rotate either
shoe (2-1) away from the anchor pin so that
the shoe slides off the shoe pad and onto
the curl of the backing plate. This procedure will minimize the hold down spring
compression required.
5.Insert a hold down pin (2-3) through the
hole in the rear of the backing plate and the
hole in the shoe (2-1) web. Hold the pin in
place.
24
Warner Electric • 800-825-9050819-0209
Page 25
Replacing Mounting Accessories
Kit No. 1301-100-003
See Page 3 for kit description
1. Loosen and remove the six nuts (8-1) and
lockwashers (8-2) holding the brake in
place.
2. Reinstall the brake on its axle flange, making sure both the brake and flange are clean
and free of all dirt and foreign material.
Check to insure the brake is mounted properly on its pilot and rests flat against the
mounting face of the axle flange.
3. Install the new nuts and washers provided
in the kit. Tighten the nuts to 71 to 79 lb. ft.
torque.
Road Test and Burnish Procedure
1. Check the brake system by measuring
amperage at each brake. Connect an
ammeter between either of the brake terminals and the wire disconnect from that terminal. The ammeter should read between
2.0–3.3 amps when brake is fully energized.
2. Make certain each brake is working
mechanically by lifting the axle, spinning the
wheel, and energizing the brake. The wheel
should come to a rapid halt.
3. Road check the brakes by making a few low
speed stops. Then burnish the brakes. A
fifty (50) stop minimum burnish at the following conditions is recommended.
Stop Speed:40 MPH – 0 MPH
Stop Accel:12 F.P.S.P.S. (Hard Stops)
Number of Stops:50 – 200
Road Condition:Seldom used road, straight
and flat, with extended visibility.
Warner Electric • 800-825-9050819-0209
25
Page 26
Warranty
Warner Electric LLC warrants that it will repair or replace (whichever it deems advisable) any
product manufactured and sold by it which proves to be defective in material or workmanship
within a period of one (1) year from the date of original purchase for consumer, commercial or
industrial use.
This warranty extends only to the original purchaser and is not transferable or assignable without
Warner Electric LLC’s prior consent.
Warranty service can be obtained in the U.S.A. by returning any defective product, transportation
charges prepaid, to the appropriate Warner Electric LLC factory. Additional warranty information
may be obtained by writing the Customer Satisfaction Department, Warner Electric LLC, 802 East
Short Street, Columbia City, Indiana 46725, or by calling 260-244-6183.
A purchase receipt or other proof of original purchase will be required before warranty service is
rendered. If found defective under the terms of this warranty, repair or replacement will be made,
without charge, together with a refund for transportation costs. If found not to be defective, you
will be notified and, with your consent, the item will be repaired or replaced and returned to you
at your expense.
This warranty covers normal use and does not cover damage or defect which results from
alteration, accident, neglect, or improper installation, operation, or maintenance.
Some states do not allow limitation on how long an implied warranty lasts, so the above limitation
may not apply to you.
Warner Electric LLC’s obligation under this warranty is limited to the repair or replacement of the
defective product and in no event shall Warner Electric LLC be liable for consequential, indirect,
or incidental damages of any kind incurred by reason of the manufacture, sale or use of any
defective product. Warner Electric LLC neither assumes nor authorizes any other person to give
any other warranty or to assume any other obligation or liability on its behalf.
WITH RESPECT TO CONSUMER USE OF THE PRODUCT, ANY IMPLIED WARRANTIES WHICH
THE CONSUMER MAY HAVE ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF
ORIGINAL CONSUMER PURCHASE. WITH RESPECT TO COMMERCIAL AND INDUSTRIAL
USES OF THE PRODUCT, THE FOREGOING WARRANTY IS IN LIEU OF AND EXCLUDES ALL
OTHER WARRANTIES, WHETHER EXPRESSED OR IMPLIED BY OPERATION OF LAW OR
OTHERWISE, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so
the above limitation or exclusion may not apply to you. This warranty gives you specific legal
rights and you may also have other rights which vary from state to state.
Changes in Dimensions and Specifications
All dimensions and specifications shown in Warner Electric catalogs are subject to change without
notice. Weights do not include weight of boxing for shipment. Certified prints will be furnished
without charge on request to Warner Electric.
War ner E lectric
802 East Short Street • Columbia City, IN 46725
260-244-6183 • Fax: 260-244-3928
www.warnerelectric.com
A-251 819-0209 8/11Printed in USA
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