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 ST-C503/BL-R440/BL-IM33 brake levers are equipped with a mode switching mechanism. Be sure to use the BR-IM70-R with the mechanism in the C.R mode position.

C.R mode position

2.

In order to get the best performance from the

Shimano Inter-M brake, be sure to use Shimano brakes cables and brake levers as a set.

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.

3.

If the hub nuts are cap nuts, use a frame with fork ends that are at least 7 mm thick.

4.

Check that the brake unit is firmly secured to the hub body with the brake unit fixing nut.

7.

If any of the following occur while using the brakes, 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.

8.

If the brakes are used frequently, the brake drum may become hot. Do not touch the brake drum for at least 30 minutes after you finish riding the bicycle.

Brake drum

MIN 2Nm

JAPAN

C

R

C

R

V

V

RELEASE

The C indicates the mode position for compatibility with cantilever brakes.

The R indicates the mode position for compatibility with roller brakes.

When securing the brake arm to the frame, be sure to use a brake arm clip that matches the size of the chainstay, and securely tighten them with the clip screw and clip nut to the specified tightening torque.

Use a lock nut with a nylon insert (self-locking nut) for the clip nut. It is recommended that standard Shimano parts be used for the clip screw, clip nut and brake arm clip.

In addition, use a brake arm clip that matches the size of the chainstay.

If the clip nut comes off the brake arm, or if the clip screw or brake arm clip becomes damaged, the brake arm may rotate on the chainstay and cause the handlebars to jerk suddenly, or the bicycle wheel may lock and the bicycle may fall over, causing serious injury.

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

1.

– To avoid serious injuries:

When using the Shimano Inter-M brake system, 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.

5.

Brake unit

Brake unit fixing nut

Tightening torque:

20 – 25 N·m {174 – 217 in. lbs.}

Check that the wheel is fixed securely to the frame with the hub nuts.

MIN 2Nm

JAPAN

RELEASE

Hub nut

Tightening torque:

30 – 45 N·m {260 – 390 in. lbs.}

6.

Check that the brake arm is securely fastened to the chainstay by the brake arm clip. If it is not installed correctly, braking performance will suffer.

Brake arm clip

Chainstay

MIN 2Nm

JAPAN

If excessive force is applied to the brake arm, the wheel will become difficult to turn. Make sure that you don't apply excessive force when installing.

Brake arm

When installing the clip screw, securely hold the clip nut with a 10 mm spanner while tightening the clip screw. After tightening, check that the clip screw protrudes about 2 –

3 mm from the surface of the clip nut.

Brake arm

Clip nut Brake arm clip

Clip screw

(M6 16 mm)

2 – 3 mm

Tightening torque:

2 – 3 N·m {17 – 26 in. lbs.}

BR-IM70R

Disconnecting the brake cable from the brake unit

1.

Push the cam transmission plate until it stops.

Then, slide the link unit along the guide groove in the cam transmission plate to remove the link unit. If the link unit is difficult to remove, turn the cable adjusting bolt clockwise to release the cable tension first.

Guide groove

RELEASE

3

Pull back strongly

2.

Slide the outer casing holder along the guide slot in the brake arm to remove it from the slot.

Guide slot

2.

Hold the cam transmission plate with your hand, and slide the link unit along the guide groove in the cam transmission plate to install the link unit.

While holding the cam transmission plate

JAPAN

1

MIN 2Nm

GREASE

RELEASE

Guide groove

Link unit

2

Place into the guide groove

RELEASE

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 the link and the spokes.

9.

If the brake cable becomes rusted, braking performance will suffer. If this happens, replace the brake cable with a genuine Shimano brake cable and re-check the braking performance.

10.

The BR-IM70-R brake unit should never be disassembled. If it is disassembled, it will no longer work properly.

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 Inter-M brake is different from conventional 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.

Parts are not guaranteed against natural wear or deterioration resulting from normal use.

For maximum performance we highly recommend

Shimano lubricants and maintenance products.

For any questions regarding methods of handling or adjustment, please contact the place of purchase.

SI-75E0C

Inter-M Brake

Technical Service Instructions

In order to realize the best performance from the Inter-M brake, we recommend that the following combinations be used.

Brake

Hub

Lever

BR-IM70-R

FH-IM70

ST-C503

BL-R440

BL-IM33

Brake cable

MIN 2Nm

JAPAN

While pushing the cam transmission plate forward

1

RELEASE

Link unit

Link unit

2

Slide down

Guide groove

MIN 2Nm

Cable adjusting bolt

JAPAN

MIN 2Nm

GREASE

JAPAN

Brake arm

GREASE

JAPAN

MIN 2Nm

RELEASE

Guide groove

Link unit

3

Slide strongly along the guide groove as far as possible

Note:

When installing the link unit to the cam transmission plate, push the link unit in until it clicks, and check that it is securely in the position shown in the illustration.

RELEASE

The rivet should fit in the center of section A of the cam transmission plate.

Section A of cam transmission plate

Link unit rivet

3.

Place the cable adjusting bolt so that it is 20 – 22 mm 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.

Outer casing holder

Cable adjusting bolt

GREASE

1.

Adjusting the brake cable

After checking that the wheel does not easily turn 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.

2.

Turn the cable adjusting bolt of the brake 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 adjusting bolt

15 mm of play

GREASE

RELEASE

Outer casing holder

To install the brake cable again, carry out the above procedure in reverse.

Note:

When installing the link unit to the cam transmission plate, push the link unit in until it clicks, and check that it is securely in the position shown in the illustration.

RELEASE

The rivet should fit in the center of section A of the cam transmission plate.

Link unit rivet

Section A of cam transmission plate

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

1.

Slide the outer casing holder along the guide slot in the brake arm to set it into the slot.

Guide slot

JAPAN

MIN 2Nm

Brake arm

Outer casing holder

4.

Should be

20 – 22 mm

Cable adjusting bolt

MIN 2Nm

JAPAN

Hole in the inner cable fixing bolt

RELEASE

RELEASE

Check that both ends of the outer casing are securely inserted into the cable adjusting bolts of both the brake lever and brake arm.

Both ends of the outer casing should be securely inserted.

MIN 2Nm

JAPAN

RELEASE

Cable adjusting bolt

3.

After depressing the brake lever to check the braking performance, secure the cable adjusting bolt with the cable adjusting nut.

MIN 2Nm

JAPAN

GREASE

JAPAN

MIN 2Nm

RELEASE

Cable adjusting bolt

5.

Push the cam transmission plate back until it stops.

Then, while pulling 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.}

MIN 2Nm

3

Tighten

JAPAN

GREASE

While pushing the cam transmission plate

1

RELEASE

Inner cable fixing nut

2

Pull strongly

Cable adjusting nut

Tightening torque:

1 – 2 N·m {9 – 17 in. lbs.}

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, Osaka 590-8577, Japan

C Oct. 2005 by Shimano Inc. PIT. SZK. Printed in Japan