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General Safety Information
WARNING
– To avoid serious injuries:
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.
The front Inter-M brake system should only be
installed to the left side of a bicycle. Furthermore,
if it is used on a bicycle which is smaller than 26",
use the HB-IM30 front hub. If this front hub is used
by mistake on a bicycle which is 26" or larger, the
braking force may be too great and the wheel may
lock, and this may cause the bicycle to lose its
balance and fall over.
The hub of the front Inter-M brake system has a
built-in power modulator which controls the
braking force to prevent it from being too great.
When the braking force reaches a certain level,
the power modulator operates to prevent the
braking force from going past that level.
The recommended operating range for the
HB-IM40 / HB-IM45 hub power modulator is for
bicycles with a gross weight (bicycle + rider +
luggage) of 65 – 120 kg.
If the gross weight of the bicycle is heavier than
the recommended weight range, the braking force
may be insufficient, and if it is lighter than the
recommended weight range, the braking force
may become too great and the wheels may lock
and bicycle may fall over. It is essential that you
fully understand and test the performance of the
power modulator before use.
The power modulator is not equipped with a
function to gprevent the wheel from locking up.
The SB-7S45 / BL-IM45 brake levers are equipped
with a mode switching mechanism. Be sure to use
the BR-IM35-FF 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.
Always make sure that the front and rear brakes
are working correctly before you ride the bicycle.
If the road surface is wet, the tires will skid more
easily. If the tires skid, you may fall off the bicycle.
To avoid this, reduce your speed and apply the
brakes early and gently.
Read these Technical Service Instructions
carefully, and keep them in a safe place for later
reference.
CAUTION
– To avoid serious injuries:
When using the Shimano Inter-M brake system,
1.
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.
In order to get the best performance from the
2.
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
3.
the hub body with the brake unit fixing nut.
Front brake unit
GREASE
Brake unit fixing nut
Tightening torque:
15 – 20 N·m {150 – 200 kgf·cm}
Check that the hub axle is touching the back of the
4.
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 hub nut. If the wheel is
not installed properly, it may come off the frame,
which could result in serious accidents when riding.
Touching
1 mm or
more
Brazed-on bracket
Hub axle
GREASE
Hub nut
Tightening torque:
30 – 45 N·m {300 – 450 kgf·cm}
If any of the following occur while using the brakes,
5.
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 brake is used
6.
frequently, the area
around the brake may
become hot. Do not touch
the area around the brake for
at least 30 minutes after
you finish riding the bicycle.
If the brake cable becomes rusted, braking
7.
performance will suffer. If this happens, replace
the brake cable with a genuine Shimano brake
cable and re-check the braking performance.
The BR-IM35-FF front brake unit and front hub
8.
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
9.
removing and installing the front brake unit.
Area around the brake
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.
Parts are not guaranteed against natural wear or
deterioration resulting from normal use.
SI-8EU0A-002
Front Inter-M
Brake System
Technical Service Instructions
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
Use the BR-IM35-FF front brake unit in conjunction with a
*
nut-type hub.
HB-IM40 / HB-IM45/ HB-NX50
SB-7S45 / SB-4S35 /SB-3S30 /
Installing the brake cable
Place the cable adjusting bolt so that it is 13 – 15 mm
1.
from the end of the outer casing holder, and then pass
the inner cable through the cable adjusting bolt and
then through the hole in the inner cable fixing bolt.
GREASE
Check that both ends of the outer casing are securely
2.
inserted into the cable adjusting bolts of both the
brake lever and brake arm.
Cable adjusting bolt
Push the link back until it stops. Then, while pulling
3.
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 {60 – 80 kgf·cm}
GREASE
Tighten
Pull strongly
2
Note:
Set the inner cable so that
it passes below the link.
BR-IM35-FF
BL-IM45 / BL-IM32
Cable adjusting bolt
Should be
13 – 15 mm
Outer casing holder
Hole in the inner
cable fixing bolt
Both ends of the outer casing
should be securely inserted.
Cable adjusting
GREASE
3
bolt
Inner cable
fixing nut
1
While pushing
the link
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 adjusting bolt of the brake unit or
2.
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 adjusting bolt
15 mm of play
GREASE
After depressing the brake lever to check the braking
3.
performance, secure the cable adjusting bolt with the
cable adjusting nut.
GREASE
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.
These service instructions are printed on recycled paper.
Please note: Specifications are subject to change for improvement without
notice. (English)
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
C
Nov. 2007 by Shimano Inc. PIT. SZK. Printed in China
Cable adjusting bolt
Cable adjusting nut
Tightening torque:
1 – 2 N·m
{10 – 20 kgf·cm}
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