Page 1
SI-75H0G-000-00
WARNING
It is important to completely understand the
operation of your bicycle's brake system. Improper
use of your bicycle's brake system may result in a
loss of control or an accident, which could lead to
severe injury. Because each bicycle may handle
differently, be sure to learn the proper braking
technique (including brake lever pressure and
bicycle control characteristics) and operation of
your bicycle. This can be done by consulting your
professional bicycle dealer and the bicycle's
owners manual, and by practicing your riding and
braking technique.
If using the BR-IM50-F in combination with a
suspension fork, care must be taken when
selecting the suspension fork to use. Please
consult with the place of purchase or the bicycle
manufacturer. If the incorrect type of suspension
fork is selected, it could cause the suspension fork
to not function properly because of overheating
during braking or lack of strength in the fork, which
could result in an accident.
The ST-T300/ ST-T400/ BL-T400/SB-7S45/BLIM45 brake levers are equipped with a mode
switching mechanism. Be sure to use the BRIM50-F with the mechanism in the C.R mode
position.
C.R mode position
V
V
C R
C R
The C indicates the mode position for
compatibility with cantilever brakes.
The R indicates the mode position for
compatibility with roller brakes.
Obtain and read the service instructions
carefully prior to installing the parts. Loose,
worn, or damaged parts may cause serious injury
to the rider. We strongly recommend only using
genuine Shimano replacement parts.
SERVICE INSTRUCTIONS
SI-75H0G
Front Inter-M
Brake System
Before use‚ read these instructions carefully‚ and follow them for
correct use.
In order to realize the best performance from the Shimano front
Inter-M brake system, we recommend that the following
combination be used.
Brake Hub Lever Brake cable
ST-T400
ST-T300
BL-T400
*
*
SB-7S45
BL-IM45
SE-4S35
SB-4S35
BL-IM33
SB-4S30
BL-IM30
HI-POWER CABLE
HB-NX50-QR
HB-NX50-NT
BR-IM50-F
Be sure to use the HB-NX50-QR or HB-IM50 only in combination
*
with the BR-IM50-F. They cannot be used in combination with
other brakes such as the BR-IM41-F (NEXUS).
HB-IM50
HB-IM45
HB-IM40
CAUTION
The Shimano Inter-M brake system cannot be used
1.
with mountain bikes. Furthermore, when using this
brake system with other kinds of bikes, avoid
continuous application of the brakes when riding
down long slopes, as this will cause the internal
brake parts to become very hot, and this may
weaken braking performance. It may also cause a
reduction in the amount of brake grease inside the
brake, and this can lead to problems such as
abnormally sudden braking.
The design of the Shimano Inter-M brake system
has been carried out based on standards such as
ISO 4210 and DIN 79100-2. These standards
specify the performance for an overall weight of
100 kg. If the overall weight exceeds 100 kg, the
braking force provided by the system may be
insufficient for correct braking, and durability of the
system may also be reduced.
The front Inter-M brake system should only be
2.
installed to the left side of a bicycle which is 26" or
larger. If it is used on a bicycle which is smaller
than 26", the braking force may be too great,
which could cause accidents.
In order to get the best performance from the
3.
Shimano front Inter-M brake, be sure to use
Shimano brakes cables and brake levers as a set.
(Refer to the product line-up.)
The amount of movement of the inner cable
must be 14.5 mm or more when the brake lever
is depressed. If it is less than 14.5 mm, braking
performance will suffer, and the brakes may fail
to work.
Check that the front brake unit is firmly secured to
4.
the hub body with the brake unit fixing nut.
JAPAN
Front brake unit
Tightening torque:
15 – 20 N·m {130 – 174 in. lbs.}
Check that the hub axle is touching the back of the
5.
fork end, and that the end of the brake arm is
protruding 1 mm or more from the brazed-on
bracket of the front fork. Check also that the wheel
is firmly secured to the frame with the quick
release. If the wheel is not installed properly, it
may come off the frame, which could result in
serious accidents when riding.
Touching
Hub axle
GREASE
GREASE
BR-IM50-F
Brake unit fixing nut
Surface with rollets should
be facing outward
JAPAN
BR-IM50-F
Set the quick release
cam lever securely.
Tightening torque:
5 – 7.5 N·m {43 – 65 in. lbs.}
1 mm or
more
Brazed-on
bracket
If any of the following occur while using the brakes,
6.
stop riding immediately and ask the place of
purchase to carry out inspection and repairs.
1) If abnormal noise is heard when the brakes
are applied
2) If braking force is abnormally strong
3) If braking force is abnormally weak
In the case of 1) and 2), the cause might be not
enough brake grease, so ask the place of
purchase to grease the mechanism with special
roller brake grease.
If the brakes are used frequently, the brake drum
7.
may become hot. Do not touch the brake drum for
at least 30 minutes after you finish riding the
bicycle.
If the brake cable becomes rusted, braking
8.
performance will suffer. If this happens, replace
Brake drum
MODULATOR
the brake cable with a genuine Shimano brake
cable and re-check the braking performance.
The BR-IM50-F front brake unit and HB-NX50/
9.
HB-IM50/ HB-IM45/ HB-IM40 front hub unit should
never be disassembled. If they are disassembled,
malfunctions and damage to the front brake unit
and front hub unit could result.
Consult the place of purchase for details on
10.
removing and installing the front brake unit.
NOTE:
Use a wheel with 3x or 4x spoke lacing. Wheels with
radial lacing cannot be used because the spokes and
the wheel can be damaged when applying the brakes
and brake noise can be generated.
The front Inter-M brake is different from conventional
band brakes in that the inside of the brake drum is
filled with grease. This may cause the turning of the
wheel to be slightly heavier than usual, particularly in
cold weather.
The front Inter-M brake has a built-in power
modulator which controls the braking force applied to
the hub. Noise is generated by the operation of the
power modulator when the brake is applied, but this
is not a sign of a malfunction.
If you apply the front Inter-M brake strongly while the
bicycle is stopped and then shake the wheel, you will
notice that there is a small amount of play in the
brakes. This is normal, and will not cause any
problems at all while riding.
To check the amount of looseness in the head parts,
grasp the middle of the handlebar and one of the
front forks as shown in the illustration, and then move
the head parts back and forth in the directions
indicated by the arrows.
Moreover, because the brakes give a small amount of
play if you apply the brakes fully and shake the wheel
as described above, this will make it more difficult to
check the looseness in the head parts.
For maximum performance we highly recommend
Shimano lubricants and maintenance products.
Disconnecting the brake cable
from the front brake unit
Push the link back until it stops. Then slide the
link arm along the guide hole of the link and
remove it from the hole. If the link arm is difficult
to remove, turn the cable adjustment bolt
clockwise to loosen the cable tension and then
remove the link arm.
Link arm
GREASE
BR-IM50-F
2
Pull strongly
Link
1
While pushing
the link
Guide hole
GREASE
BR-IM50-F
To install the brake cable again, carry out the
above procedure in reverse.
Note:
While looking from the rear of the link,
check that the link arm is firmly seated in
the position shown in the above illustration.
Guide hole
Link arm
Depress the brake lever to check the
braking performance. If the braking
performance is poor, adjust the brake cable
once more while referring to "Adjusting the
brake cable".
Installing the brake cable
While depressing the brake lever, pass the brake
1.
cable set through the hole in the bracket.
Brake cable set
Bracket
Align the inner cable end with the hole in the cable
2.
hook, and then turn the cable hook as shown in the
illustration and insert the inner cable end into the
hole.
Inner cable end
Cable hook
Place the outer casing holder onto the brazed-on
3.
bracket, and then tighten the outer casing holder
fixing nut.
Outer casing holder
Brazed-on bracket
Outer casing holder fixing nut
Tightening torque:
2 – 3 N·m {17 – 26 in. lbs.}
While holding the link to secure it so that it does not
4.
move, slide the link arm along the guide hole of the
link to install it.
GREASE
BR-IM50-F
Guide hole
Link arm
1
Secure the
link
GREASE
BR-IM50-F
2
Pull strongly
Note:
While looking from the rear of the link, check
that the link arm is firmly seated in the position
shown in the above illustration.
Guide hole
Link arm
Place the cable adjustment bolt so that it is 20 – 22
5.
mm from the end of the outer casing holder, and
then pass the inner cable through the cable
adjustment bolt and then
through the hole in the
inner cable fixing bolt.
Cable adjustment bolt
Should be
20 – 22 mm
JAPAN
GREASE
BR-IM50-F
Check that both ends of the outer casing are
6.
securely inserted into the cable adjustment bolts of
both the brake lever and brake arm.
Cable adjustment bolt
These service instructions explain how to use and maintain the
Shimano bicycle parts which have been used on your new
bicycle. For any questions regarding your bicycle or other
matters which are not related to Shimano parts‚ please contact
the place of purchase or the bicycle manufacturer.
Please note: Specifications are subject to change for improvement without
notice. (English)
Outer casing holder
Hole in the inner
cable fixing bolt
Both ends of the outer
casing should be securely
inserted.
JAPAN
Cable adjustment
bolt
BR-IM50-F
Push the link back until it stops. Then, while pulling
7.
the inner cable to apply the full amount of tension to
the cable, tighten the inner cable fixing nut.
Tightening
torque:
6 – 8 N·m
{52 – 69 in. lbs.}
Inner cable fixing nut
2
Pull strongly
Tighten
GREASE
JAPAN
3
BR-IM50-F
1
While
pushing the link
Note:
After tightening the inner cable
fixing nut, attach the inner end
cap to the end of the inner
cable. Then set the inner end
cap so that it does not touch
BR-IM50-F
the link and the spokes.
Adjusting the brake cable
After checking that the wheel does not easily turn
1.
while the brake cable is being pulled, depress the
brake lever about 10 times as far as the grip in order
to run in the
brake cable.
Depress about
10 times
Note:
If the brake cable is not run in, it will need to be
adjusted again after only a short period of use.
Turn the cable adjustment bolt or nut of the brake
2.
unit or brake lever so that there is about 15 mm of
play in the brake lever.
The amount of brake lever play is the distance
from the position where the brake lever is not
operated to the position where a force is felt
suddenly when the brake lever is pulled.
Cable adjustment bolt or nut
15 mm of play
JAPAN
Cable adjustment
bolt
After depressing the brake lever to check the
3.
braking performance, secure the cable adjustment
bolt with the cable adjustment nut.
Tightening torque:
1 – 2 N·m
{9 – 17 in. lbs.}
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
3-77 Oimatsu-cho, Sakai-ku, Sakai, Osaka 590-8577, Japan
BR-IM50-F
JAPAN
Cable adjustment nut
C
May 2009 by Shimano Inc. PIT. SZK. Printed in Japan
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