SI-8G70C-001-00

SI-8G70C-001 Align the red mark on the inner cable fixing washer so that Check that the red marks on inner cable fixing washer
General Safety Information 4. it faces in the direction of the groove in the winder unit,
and then insert the inner cable fixing bolt unit and push it
10. with the inner cable fixing bolt unit press-fit into the winder
unit are in the right orientation.
If any of the following occur while using the brakes, stop BR-IM81-F
WARNING CAUTION 6. riding immediately and ask the place of purchase to carry
out inspection and repairs. BR-IM80-F
into the groove in the winder unit as far as it will go.
Red mark Red mark

– To avoid serious injuries: – To avoid serious injuries: Inter-M Brake

● It is important to completely understand the operation When using the Shimano Inter-M brake system, avoid
1) If abnormal noise is heard when the brakes are
BR-IM55-F
of your bicycle’s brake system. Improper use of your
bicycle’s brake system may result in a loss of control
1. continuous application of the brakes when riding down
long slopes, as this will cause the internal brake parts
applied
2) If braking force is abnormally strong
3) If braking force is abnormally weak
BR-IM45-F Groove in winder unit
Red mark on
or an accident, which could lead to severe injury. to become very hot, and this may weaken braking In the case of 1) and 2), the cause might be not enough inner cable
Because each bicycle may handle differently, be sure performance. It may also cause a reduction in the brake grease, so ask the place of purchase to grease the fixing washer
amount of brake grease inside the brake, and this can mechanism with special roller brake grease.
to learn the proper braking technique (including brake
lever pressure and bicycle control characteristics) and
lead to problems such as abnormally sudden braking. Before applying grease, remove the grease hole cap Technical Service Instructions Installation of the brake cable can be completed by the
The design of the Shimano Inter-M brake system has and press-fit the tube into the back of the hole. Apply an above procedure. When detaching the cable, perform in
operation of your bicycle. been carried out based on standards such as ISO appropriate amount of grease (approx. 5g) while turning Inner cable fixing bolt unit reverse order.
This can be done by consulting your professional 4210 and DIN 79100-2. These standards specify the
bicycle dealer and the bicycle’s owners manual, and the wheel slowly. After application, check that braking is
performance for an overall weight of 100 kg. However, properly applied and that no abnormal noise is heard.
by practicing your riding and braking technique. Insert the inner cable fixing
BR-IM81-F is designed with the overall weight assumed
In order to realize the best performance from the Shimano bolt unit into the groove in the
● If the front brake is applied too strongly, the wheel to be 130kg. If the overall weight exceeds 100 kg (130kg
may lock and the bicycle may fall forward, and for BR-IM81-F), the braking force provided by the system Grease hole cap
front Inter-M brake system, we recommend that the following
combination be used.
winder unit as far as it will go. Adjusting the brake cable
serious injury may result. may be insufficient for correct braking, and durability of
After checking that the wheel does not easily turn while
● The hub of the Shimano front Inter-M brake has a
built-in power modulator. This system controls the
the system may also be reduced.
The front Inter-M brake system should only be installed
Brake BR-IM81-F
BR-IM80-F
BR-IM55-F/
BR-IM45-F 1. the brake cable is being pulled, depress the brake lever
braking force so that excessive force is not applied
if the braking force reaches the specified value. If
2. 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
Hub HB-IM70/ HB-IM40/ 5. Route the inner cable along the groove of the winder unit. about 10 times as far as the grip in order to run in the
brake cable.
DH-2R35-E-H/ DH-2R35-E/
the hub is not equipped with the power modulator, force may be too great, which could cause accidents.
DH-3R35-H DH-3R35/
the braking force may be excessively applied. For In order to get the best performance from the Shimano Grease for DH-2R30-J Depress
this reason, we recommend using the Shimano
front Inter-M brake and the hub as a set. Noise is
3. front Inter-M brake, be sure to use Shimano brakes
cables and brake levers as a set. (Refer to the product Turn
roller brake
Lever
SB-8S20/ST-8S20/SB-7S45/
about
10 times
line-up.) BL-IM60/BL-IM65/BL-IM45
generated by the operation of the power modulator slowly. 12mm or more
when the brake is applied, but this is not a sign of a The amount of movement of the inner cable must be Brake cable Groove of winder unit Inner cable
malfunction. 14.5 mm or more when the brake lever is depressed. If the brakes are used
● Never tighten the inner cable fixing bolt with it If it is less than 14.5 mm, braking performance will
suffer, and the brakes may fail to work.
7. frequently, the components
Components
around the brake
Hook the inner cable over the cable hook.
attached to your bicycle. Doing so may cause the
inner cable fixing bolt to detach. Check that the front brake unit is firmly secured to the
around the brake may
become hot. Do not touch the Installing the brake cable 6. Note:
4. hub with the brake unit fixing nut. components for at least 30
minutes after you finish riding After checking that the adjusting bolt and adjusting nut are
If the brake cable is not run in, it will need to be
the bicycle. 1. fully tightened, insert the outer casing holder unit into the
inner cable in the direction shown below.
adjusted again after only a short period of use.

Turn the cable adjusting bolt of the brake unit or brake

Brake unit fixing nut
● In case of the quick release
Adjusting nut Outer casing holder unit
Inner cable
2. lever so that there is about 15 mm of play in the brake
lever.
type:
The amount of brake lever play is the distance from
With rollets
Surface with rollets should the position where the brake lever is not operated to
be facing outward the position where a force is felt suddenly when the
● In case of the hub nut type: If the brake cable becomes rusted, braking performance Adjusting bolt Cable hook brake lever is pulled.
Brake unit without rollets 8. will suffer. If this happens, replace the brake cable with a
genuine Shimano brake cable and re-check the braking
Cable adjusting bolt
After checking that the stamp of the back side of the inner
● If using the BR-IM81-F, BR-IM80-F, BR-IM55-F, Tightening torque:
performance.
The front brake unit, front hub units should never be
2. cable fixing bolt unit is “F”, pass the inner cable through
Insert the outer casing holder unit into the hole of the
BR-IM45-F in combination with a suspension fork,
care must be taken when selecting the suspension
15 – 20 N·m {131 – 174 in. lbs.}

Check that the hub axle is touching the back of the fork
9. disassembled. If they are disassembled, it will no longer
work properly.
the hole of the inner cable fixing bolt unit.
7. brake arm from underneath and slide it to the lower
section of the hole.
15mm of play

fork to use. Please consult with the shop or the

bicycle manufacturer. If an incorrect type of 5. end, and that the end of the brake arm is protruding 11
mm or more from the brazed-on bracket of the front fork.
suspension fork is selected, it could prevent the
Check also that the wheel is firmly secured to the frame NOTE: Stamp “F” Outer casing
suspension fork from functioning properly because of
with the quick release or the hub nut. If the wheel is not ● Use a wheel with 3x or 4x spoke lacing. Wheels with holder unit
overheating during braking or lack of strength in the installed properly, it may come off the frame, which could radial lacing cannot be used because the spokes and the Brake arm
fork, which could result in an accident. Inner cable fixing bolt unit
result in a serious accident when riding. wheel can be damaged when applying the brakes and
● The SB-8S20/ST-8S20/SB-7S45/BL-IM60/BL-IM65/ brake noise can be generated.
BL-IM45 brake levers are equipped with a mode ● The front Inter-M brake is different from conventional Place the components as shown in the following figure
switching mechanism. Be sure to use the BR-IM81-F,
BR-IM80-F, BR-IM55-F, BR-IM45-F with the
Touching
11mm or
more
band brakes in that the inside of the brake drum is filled
with grease. This may cause the turning of the wheel to
3. and tighten the inner cable fixing nut. Use the TL-IM21
(inner cable fixing tool) to tighten the inner cable fixing
mechanism in the C.R. mode position. be slightly heavier than usual, particularly in cold weather. nut as shown in Fig. 1. After tightening, check that the Cable adjusting bolt
Brazed-on ● If you apply the front Inter-M brake strongly while the orientations of the inner cable fixing nut and inner cable
Hub axle bracket bicycle is stopped and then shake the wheel, you will are correct as shown in Fig. 2.
C.R mode position After depressing the brake lever to check the braking
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.
Fig. 1 109mm
Inner cable
fixing nut 8. After checking that the outer casing holder unit is securely
inserted into the back of the brake arm hole, attach the
inner end cap.
3. performance, secure the cable adjusting bolt with the
cable adjusting nut.
● To check the amount of looseness in the head parts, Then, set the inner end cap so that it does not touch the
grasp the middle of the handlebar and one of the front fin or the spokes.
forks as shown in the illustration, and then move the head Cable adjusting nut
parts back and forth in the directions indicated by the
arrows. Inner end cap
Moreover, because the brakes give a small amount of TL-IM21
The C indicates the mode position for play if you apply the brakes fully and shake the wheel as
compatibility with cantilever brakes. described above, this will make it more difficult to check Tightening torque:
The R indicates the mode position for the looseness in the head parts. 6 – 8 N·m {52 – 70 in. lbs.}
compatibility with roller brakes.
Fig. 2 Tightening torque:
Outer casing 1 – 2 N·m {9 – 17 in. lbs.}
● Obtain and read the service instructions carefully ● In case of the quick release type: holder unit
prior to installing the parts. Loose, worn, or Secure the cam lever of the
damaged parts may cause serious injury to the rider. quick release firmly.
We strongly recommend only using genuine Shimano Never tighten the inner cable fixing bolt with it attached to Turn the cable adjusting bolt to tighten the inner cable. These service instructions explain how to use and maintain
replacement parts.
● Always make sure that the front and rear brakes are
Tightening torque:
5 – 7.5 N·m {44 – 65 in. lbs.}
your bicycle. The orientations of the inner cable fixing nut
and inner cable will become improper as shown in Fig. 3, 9. the Shimano bicycle parts which have been used on your new
bicycle. For any questions regarding your bicycle or other
working correctly before you ride the bicycle. which may cause the inner cable fixing bolt to detach from matters which are not related to Shimano parts, please contact
● If the road surface is wet, the tires will skid more the brake. the place of purchase or the bicycle manufacturer.
● In case of the nut type:
easily. If the tires skid, you may fall off the bicycle. To Fig. 3
avoid this, reduce your speed and apply the brakes * Service Instructions in further languages are available at:
early and gently. http://techdocs.shimano.com
● Read these Technical Service Instructions carefully, Please note: specifications are subject to change for improvement
Cable adjusting bolt without notice. (English)
and keep them in a safe place for later reference.

● Parts are not guaranteed against natural wear or

deterioration resulting from normal use.
Hub nut
● For maximum performance we highly recommend SHIMANO AMERICAN CORPORATION
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Shimano lubricants and maintenance products.
Tightening torque: ● For any questions regarding methods of handling or SHIMANO EUROPE B.V.
20 – 25 N·m {174 – 218 in. lbs.} Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
adjustment, please contact the place of purchase.
SHIMANO INC.
3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan
© Jun. 2011 by Shimano Inc. AWS. Printed in China