Bendix E-14 DUAL BRAKE VALVE User Manual

®

Bendix® E-14™ Dual Brake Valve

EXHAUST

FIGURE 1 - E-14

SECONDARY DELIVERY

SECONDARY SUPPLY

PRIMARY

SUPPLY

™

DUAL BRAKE V ALVE

PRIMARY

DELIVERY

SD-03-828

DESCRIPTION

The E-14™ dual brake valve is a suspended-pedal foot valve
with two separate supply and delivery circuits. The valve
provides the driver with graduated control for applying and
releasing the vehicle brakes.

The circuits in the E-14™ dual brake valve are identified as
follows: The number one (primary) circuit is the portion of
the valve between the primary piston and the secondary
piston. The number two (secondary) circuit consists of the
area between the secondary piston and the exhaust cavity .

The supply , delivery , and exhaust ports of the E-14™ brake
valve are identified by designations cast into the valve body
next to the port. (See Figure 1). The primary supply and
delivery ports are located in the valve’s primary body, and
the secondary supply and delivery ports are located in the
secondary body.

QUICK RELEASE

VALVE

FRONT SERVICE

BRAKE CHAMBER

PRIMARY

CIRCUIT

DOUBLE CHECK

VALVE

SECONDARY

CIRCUIT

™

E-14

DUAL

BRAKE

VALVE

SERVICE RESERVOIR

CONTROL

REAR AXLE

TRAILER

VALVE

FRONT AXLE

SERVICE RESERVOIR

TO TRACTOR
PROTECTION

DOUBLE CHECK

AND

STOP LIGHT SWITCH

REAR AXLE

SERVICE RELAY

VALVE

REAR SERVICE

BRAKE CHAMBER

FIGURE 2 - TYPICAL PIPING SCHEMA TIC

1

SECONDARY DELIVERY (#2)

EXHAUST

PRIMARY

DELIVERY (#1)

PLUNGER

ROLLER

SECONDARY SUPPLY

(#2)

PRIMARY

SUPPLY (#1)

MOUNTING PLATE

PIVOT PIN

PEDAL

MANIFOLD

SEALING

RING

MOUNTING

PLATE

(FIREWALL)

ADAPTER SLEEVE

O-RING

MOUNTING

PLATE (PEDAL)

A

E-14™ DUAL

BRAKE VALVE

FIGURE 3 - E-14™ DUAL BRAKE V ALVE CROSS SECTIONAL VIEW

The primary circuit operates similar to a standard single
circuit air brake valve, and under normal operating
conditions the secondary circuit operates similar to a relay
valve.

Both the primary and secondary circuits use a common
exhaust, protected by an exhaust diaphragm.

OPERATION

APPL YING: NORMAL OPERA TION-PRIMARY CIRCUIT

When the brake pedal is depressed, the plunger exerts a
force on the spring retainer(7), graduating spring(8), and
primary piston(2). The primary piston, which contains the
exhaust valve seat, closes the primary circuit exhaust valve.
As the exhaust valve closes, the inlet valve for the primary
circuit moves off its seat, allowing air from the primary
circuit supply port to flow out the delivery port.

APPLYING: NORMAL OPERATION-SECONDARY
CIRCUIT

The secondary piston(18) moves with the primary piston
and closes the secondary circuit exhaust. When the inlet
valve in the primary portion of the valve is moved off its

B

E-14™ DUAL BRAKE

VALVE WITH MANIFOLD

seat, air passes through the bleed passage in the secondary
portion of the primary body and enters the secondary piston
cavity . The air moves the secondary piston and opens the
secondary inlet valve, allowing the air from the secondary
supply to flow out the delivery port.

APPL YING: LOSS OF AIR IN THE PRIMAR Y CIRCUIT

If the brake pedal is depressed and no air pressure is
present in the primary circuit, the primary piston will
mechanically move the secondary piston, closing the
secondary exhaust and opening the secondary inlet,
allowing air flow from the secondary supply to its delivery
port.

APPL YING: LOSS OF AIR IN THE SECONDARY CIRCUIT

If the air is lost in the secondary circuit, the primary circuit
will function normally, as described in “Normal Operation:
Primary Circuit.”

BALANCED: PRIMARY CIRCUIT

When the primary delivery pressure acting upon the primary
piston equals the mechanical force of the brake pedal
application, the primary piston will close, preventing further

2

EXHAUST

EXHAUST

DEL-2

DEL-1

AIR FLOW

PLUNGER

FORCE

á

SUP-2

SUP-1

DEL-2

SUP-2

DEL-1

SUP-1

DEL-1

PLUNGER

FORCE

PEDAL FORCE

PEDAL FORCE

á

AIR FLOW

FIGURE 4 - APPL YING - NORMAL OPERATION

air flow from the supply port to the delivery port. The exhaust
valve remains closed, preventing the escape of air through
the exhaust port.

BALANCED: SECONDARY CIRCUIT

When air pressure on both sides of the secondary piston
approach each other, the piston moves, closing the
secondary inlet valve and preventing further air flow from
the supply line through the valve. The exhaust remains closed
as the secondary delivery pressure balances the primary
delivery pressure.

RELEASING: PRIMARY CIRCUIT

When the force on the brake pedal is released, mechanical
force is removed from the graduating spring and the primary
piston. Air pressure in the delivery circuit moves the primary
piston and opens the primary exhaust valve, allowing air
pressure in the primary circuit to exit through the exhaust
port.

FIGURE 5 - APPL YING - F AILURE IN THE PRIMARY CIRCUIT

RELEASING: SECONDARY CIRCUIT

When the brake pedal is released, air is exhausted from the
primary circuit side of the secondary piston through the bleed
passage. Air pressure in the delivery side of the secondary
circuit moves the piston and opens the secondary exhaust
valve, allowing air pressure in the secondary delivery line to
exit through the exhaust port.

PREVENTIVE MAINTENANCE

Important: Review the warranty policy before performing

any intrusive maintenance procedures. An extended warranty
may be voided if intrusive maintenance is performed during
this period.

Because no two vehicles operate under identical conditions,
maintenance and maintenance intervals will vary . Experience
is a valuable guide in determining the best maintenance
interval for any one particular operation.

Visually check for physical damage to the brake valve such
as broken air lines and broken or missing parts.

3

EXHAUST

DEL-2

SUP-2

EXHAUST

SUP-2

DEL-2

DEL-1

SUP-1

DEL-1

PLUNGER

FORCE

PEDAL

FORCE

á

AIR FLOW

FIGURE 6 - APPL YING-F AILURE IN THE SECONDAR Y CIRCUIT

DEL-1

DEL-1

PLUNGER

FORCE

á

AIR FLOW

FIGURE 7 - BALANCED POSITION

SUP-1

PEDAL

FORCE

EVERY 3 MONTHS, 25,000 MILES OR 900 OPERATING
HOURS

1. Remove any accumulated contaminants such as dirt
and gravel from the heel of the pedal, plunger, plunger
boot, and mounting plate.

2. Using a light oil, lubricate the pedal roller, roller pin, and
hinge pin.

3. Inspect the plunger boot for cracks, holes, or
deterioration. Replace if necessary. Also check mounting
plate and pedal for wear and corrosion. Repair or replace
as necessary .

4. Apply 2 to 4 drops of oil between plunger and mounting
plate - DO NOT OVER OIL!

5. Check for excessive leakage as described in the
“OPERATIONAL & LEAKAGE TEST” section of this
manual.

EVERY YEAR, 100,000 MILES, OR 3,600 OPERATING
HOURS

1. Perform steps 1 through 4 above.

2. Perform the checks in the “OPERA TION & LEAKAGE
TEST” section of this manual.

4

OPERATIONAL & LEAKAGE TESTS

GENERAL

A change in vehicle braking characteristics or a low pressure
warning may indicate a malfunction in one of the brake
circuits. Although the air brake system may continue to
function, the vehicle should not be operated until the
necessary repairs have been made and both braking circuits,
including the pneumatic and mechanical devices, are
operating normally .

If the brake valve does not function as described above or if
leakage is excessive, it is recommended that it be replaced
with a new or remanufactured unit, available at Bendix outlets.

Always check the vehicle brake system for proper operation
after performing brake work and before returning the vehicle
to service.

OPERATIONAL TEST

Check the delivery pressure of both circuits, using test
gauges known to be accurate. Note: The pedal will not be in
a “normal” released position until the air brake system is
pressurized. The pedal will rise to its normal release position
as the brake system is pressurized from 0 psi. Depress the
pedal to several positions between the fully released and
fully applied positions and check the delivered pressure on
the test gauges to see that it varies equally and proportionally
with the movement of the brake pedal.

EXHAUST

SUP-2

SUP-1

DEL-1

DEL-1

DEL-2

PLUNGER

FORCE

FIGURE 8 - RELEASED MODE

PEDAL FORCE

After a full application is released, the reading on the test
gauges should fall off to zero promptly . NOTE: the number
one circuit delivery pressure will be about four psi greater
than the number two circuit delivery pressure with both supply
reservoirs at the same pressure. This is normal for the E-14
brake valve.

LEAKAGE TEST

Make and hold a high pressure application (80 psi). Coat
the exhaust port and body of the brake valve with a soap
solution. Leakage permitted is a 1" bubble in 3 seconds in
both the applied and released positions. No leakage is
permitted anywhere else.

WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO AVOID
PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following
general precautions should be observed at all times.

1. Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.

2. Stop the engine and remove ignition key when
working under or around the vehicle. When
working in the engine compartment, the engine
should be shut off and the ignition key should be

removed. Where circumstances require that the
engine be in operation,

EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.

3. Do not attempt to install, remove, disassemble or
assemble a component until you have read and
thoroughly understand the recommended
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.

4. If the work is being performed on the vehicle’s air
brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure from
all reservoirs before beginning

ANY work on the
vehicle. If the vehicle is equipped with an AD-IS
air dryer system or a dryer reservoir module, be
sure to drain the purge reservoir.

5. Following the vehicle manufacturer’s
recommended procedures, deactivate the electrical
system in a manner that safely removes all
electrical power from the vehicle.

6. Never exceed manufacturer’s recommended
pressures.

7. Never connect or disconnect a hose or line
containing pressure; it may whip. Never remove a
component or plug unless you are certain all
system pressure has been depleted.

8. Use only genuine Bendix® replacement parts,
components and kits. Replacement hardware,
tubing, hose, fittings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifically for such applications and
systems.

9. Components with stripped threads or damaged
parts should be replaced rather than repaired. Do

™

not attempt repairs requiring machining or welding
unless specifically stated and approved by the
vehicle and component manufacturer.

10. Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.

V AL VE REMOVAL

1. Identify and mark or label all air lines and their respective

connections on the brake valve to facilitate ease of
installation. Disconnect all air lines.

2. Remove the valve from its mounting on the vehicle. For

manifold-type valves, remove the brake valve and manifold,
in tact, from the vehicle.

DISASSEMBLY (SEE FIGURE 9)

The following disassembly and assembly procedure is
presented for reference purposes only. Always have the
appropriate maintenance kit on hand, and use its instructions
in lieu of those presented here. Refer to Figure nine
throughout the procedure.

™

5

CAUTION: The brake valve may be light clamped in a bench

vise, but overclamping may damage the valve and
cause leakage and/or malfunction. If a vise is used,
clamp on the supply and delivery ports on opposing
sides of the valve’s primary body .

1. Remove all air line fittings and plugs.

2. On valves that have a manifold on the engine
compartment side, remove the bolts that secure the
manifold to the valve. Separate the valve and manifold
and remove the sealing rings and adapter sleeves. (See
Figure 2.)

3. Remove the four cap screws(16) that secure the primary
body to the secondary body. Separate the two body
halves and remove and discard o-ring(17).

4. Pull secondary piston(18) out of the primary body and
remove and discard o-rings(19 & 20).

5. Remove and discard snap ring(10) from the secondary
body while manually holding and compressing valve
seat(1 1) in place.

6. Slowly release valve seat(11), allowing it to rise out of
the body . Remove the valve seat, then remove and discard
o-ring(12).

7. Remove and discard valve assembly(13) along with its
o-ring(15) from the secondary body . Remove the valve
assembly return spring(14).

8. Carefully remove and discard exhaust diaphragm
screw(24), diaphragm washer(25), diaphragm(26), and
diaphragm retainer(27) from the secondary body . NOTE:
Some E-14™ brake valves have a threaded exhaust port
instead of items 24-27.

9. Using light force, push piston(2) into the primary body
until piston retaining ring(1) is fully visible. Remove piston
retaining ring(1), taking care not to damage the piston
bore in the body.

10.Gently tap the primary body on a soft surface to remove
piston(2). Remove and discard o-rings(3 & 5) and both
wear rings(4) from piston(2).

11. Place the piston on a flat surface. Using finger force,
depress and hold spring retainer(7), then remove and
discard retaining ring(6) from piston(2).

12.Gently release spring retainer(7), allowing it to rise out
of the piston. Remove spring retainer(7) and graduating
spring(8) from piston(2).

13. Remove and discard rubber spring(9) from the interior of
piston(2).

14.Remove and discard snap ring(10) from piston(2) while
manually holding and compressing valve seat(11) in
place.

15.Slowly release valve seat(11), allowing it to rise out of
piston(2). Remove valve seat(1 1), then remove and discard
o-ring(12).

16.Remove and discard valve assembly(13) along with its
o-ring(15) from piston(2). Remove valve assembly return
spring(14).

CLEANING & INSPECTION

1. Using mineral spirits or an equivalent solvent, clean and
thoroughly dry all metal parts.

2. Inspect the interior and exterior of all metal parts that
will be reused for severe corrosion, pitting, or cracks.
Superficial corrosion and/or pitting on the exterior portion
of the secondary and primary bodies is acceptable.

3. Inspect the bores of both bodies for deep scuffing or
gouges.

4. If primary piston(2) is reused, make certain that vents
“A & B” are open and free of obstructions. (See Figure

2.)

5. Make certain vent “C” is open in the primary body of the
valve. (See Figure 2.)

6. Inspect the pipe threads in both bodies. Make certain
they are clean and free of thread sealant.

7. Inspect pedal assembly and mounting plate. Make certain
the pedal roller turns freely and is lightly lubricated.
Note: Some pedal assemblies, not furnished by Bendix,
do not employ a roller. In this case, make certain the
mechanism in use moves across the plunger smoothly ,
without binding or sticking. Inspect plunger for excessive
scuffing or wear. Check the plunger bore in the mounting
plate for excessive wear, shown by “egg shaping” (bell
mouthing). Inspect mounting plate for severe corrosion,
paying particular attention to the area around the pivot
pin bores.

8. If the brake valve uses a rubber boot between the plunger
and mounting plate, inspect the boot for deterioration
or cracking.

9. Inspect all air line fittings and plugs for corrosion Clean
all old thread sealant from the pipe threads.

Any valve or pedal assembly component that does not meet
the inspection criteria listed above should be discarded and
replaced before proceeding.

ASSEMBL Y (SEE FIGURE 9)

1. Using silicone lubricant (650-M), lightly coat all o-rings,
o-ring bores, and grooves, except for the secondary
piston o-rings(19 and 20). Lightly lubricate primary
piston(2) bore into which graduating spring(8) is installed.
With the 328-M lubricant, lightly coat o-rings (19 and

20) and o-ring grooves on secondary piston(18).

6

24

25 26

16

10
11

12

27

13

14

15

15

14

17

18

19

13

10

12

11

22

20

23

5

4

2

4

3

8

9

21

1

7

6

FIGURE 9 - EXPLODED VIEW

MOUNTING PLATE

PLUNGER

PEDAL ASSEMBLY

7

2. Place primary piston(2) on a flat surface and install rubber
spring(9) and metal graduating spring(8).

3. Install graduating spring retainer(7) on top of graduating
spring(8), making certain that the side with the high
circular protrusion is away from the spring.

4. Manually depress and hold spring retainer(7) in piston(2),
then install snap ring(6), making certain it is completely
seated in its groove in piston(2).

5. Install o-rings(15) on both valve assemblies(13).

6. Install valve spring(14) in piston(2), then install valve
assembly(13) in the spring.

7. Install o-ring(12) into the o-ring groove of piston(2), then
install valve seat(11) on valve assembly(13). Gently
depress and hold the valve seat in piston(2) while
installing retaining ring(10).

8. Install o-rings(3 and 5) on primary piston(2), then install
wear rings(4) in the o-ring grooves next to the o-rings.
Make certain that one flange of the wear ring(4) is in the
o-ring groove, while the opposite flange extends away
from the end of piston(2) and toward the center. The
wear ring flange MUST NOT COVER OR OVERLAP
EITHER O-RING . (See Figure 10.)

9. Carefully insert the assembled primary piston(2), valve
end first, into the primary valve body until the piston
retaining ring groove in the body is visible. Make certain
o-rings(3 and 5) and wear rings(4) are not damaged in
the process. Do not force the piston. If substantial
resistance is encountered, check for proper installation
of the wear rings.

10. Install piston retaining ring(1) in its groove in the
secondary body , making certain it is fully seated in the
groove.

1 1. Install plunger(21) in its return spring(22). Install the spring

and plunger on secondary piston(18). While manually
depressing and holding the plunger and spring on the
piston, slide plunger and spring retainer(23) into place
so that it secures both the plunger and spring to the
piston. Make certain the retainer flanges are securely
around piston lip and plunger groove.

12.Install o-rings(19 and 20) on secondary piston(18).

13. Install diaphragm retainer(27), diaphragm(26), diaphragm
washer(25). and screw(24) in the exhaust port. Torque
screw to 15-25 in. lbs. NOTE: Some E-14™ brake valves
have threaded exhaust ports instead of items 24-27.

14. Install valve spring(14) in the secondary body, then install
valve assembly(13) in the spring.

15.Install o-ring(12) into the o-ring groove of piston(2), then
install valve seat(11) on valve assembly(13). Gently
depress and hold the valve seat in the secondary body
while installing retaining ring(10).

PRIMARY PISTON

➋

DEL-1

21

O-RING

➎

WEAR RINGS

➍

SUP-1

11

FIGURE 10

O-RING

➌

16. Install the assembled secondary piston(18) in the primary
body, making certain that o-rings(19 and 20) are not
damaged.

17. Install o-ring(17) on the secondary body. Join the
assembled secondary and primary bodies. Secure the
bodies using the four cap screws(16), and torque to 30
to 60 in. lbs.

18. Install the pedal mounting plate on the basic brake valve,
noting the relationship marked during V AL VE REMOVAL
step 2. Secure the mounting plate to the valve using the
three cap screws and torque to 80 to 120 in. lbs.

19.If using a manifold-type valve, install the sealing rings
and adapter sleeves that connect the valve to the
manifold. Install the manifold on the valve, and secure
with its bolts. Torque to 80 to 120 in. lbs.

20. Install all air line fittings and plugs, making certain thread
sealant material does not enter the valve.

V ALVE INST ALLATION

1. Install the assembled brake valve on the vehicle.

2. Reconnect all air lines to the valve using the identification
made during V AL VE REMOVAL step 1.

3. After installing the brake valve assembly, perform the
“OPERA TIONAL & LEAKAGE CHECKS” before placing
the vehicle in service.

8

BW1666 © 2004 Bendix Commercial Vehicle Systems LLC. All rights reserved. 3/2004 Printed in U.S.A.