SI-8EV0A-003-00
General Safety Information
WARNING
− To avoid serious injuries:
• Improper use of your bicycle's brake system may result in a loss of control or an accident, which could lead to a severe injury. Because each bicycle may handle differently, be sure to learn the proper braking technique (including brake lever pressure and bicycle control characteristics) for your bicycle.
Consult your bicycle dealer and the bicycle's owners manual, and practice your riding and braking technique.
• If the front brake is applied too strongly, the wheel may lock and the bicycle may fall forward, and serious injury may result.
• Securely tighten the caliper brake mounting nuts to the specified tightening torque.
• Use lock nuts with nylon inserts (self-locking nuts) for nut- type brakes.
• For sunken nut type brakes, use sunken nuts of the appropriate length which can be turned six times or more; when re-installing, apply sealant (locking adhesive) to the nut threads.
If the nuts become loose and the brakes fall off, they may get caught up in the bicycle and the bicycle may fall over.
Particularly if this happens with the front wheel, the bicycle may be thrown forward and serious injury could result.
• Brakes designed for use as rear brakes should not be used as front brakes.
• Obtain and read the service instructions carefully prior to installing the parts.
Loose, worn or damaged parts may cause the bicycle to fall over and serious injury may occur as a result.
We strongly recommend only using genuine Shimano replacement parts.
• Be careful not to allow any oil or grease to get onto the brake shoes. If any oil or grease do get on the shoes, you should replace the shoes, otherwise the brakes may not work correctly.
• Check the brake cable for rust and fraying, and replace the cable immediately if any such problems are found. If this is not done, the brakes may not work correctly.
• Always make sure that the front and rear brakes are working correctly before you ride the bicycle.
• The required braking distance will be longer during wet weather.
Reduce your speed and apply the brakes early and gently.
• 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.
NOTE:
• If using SHIMANO's road brake shoes in combination with ceramic rims, the brake shoes will wear more quickly than normal.
• If the brake shoes have worn down until the grooves are no longer visible, they should be replaced.
• Different brake shoes have their own characteristics. Ask the place of purchase for details when purchasing the brake shoes.
• 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 maintenance, please contact the place of purchase.
2.
BR-R451
BR-R450
SI-8EV0A-003
3.
Temporarily secure the outer casing to the handlebar (by using tape or similar material).
Outer casing
Caliper Brake
Technical Service Instructions
In order to realize the best performance, we recommend that the following combination be used.
Brake lever
Caliper Brake
Brake cable
ST-4500 / ST-3400 / ST-2300
BR-R451 / BR-R450
Tape
4.
Then wrap the handlebar with handlebar tape.
Note:
• Cut the cable at the length at which it is not pulled tight when the handlebar is turned all the way to the left and right.
• If a squeaking noise occurs after a long period of use,
1.
Installation of the brake lever
Outer casing
5 mm Allen key
Tightening torque:
6 – 8 N·m
{52 – 69 in. lbs.}
Cable hook
Inner cable end
Outer casing
Inner cable end
Installation bolt
Cable hook
A A
Installation of the brake
1.
Installation of the brake itself
Compress the arch, and set while the shoe is in firm contact with the rim
Tightening torque:
8 – 10 N·m {69 – 87 in. lbs.}
5 mm Allen key
The usual position during installation is when the head of the centering adjustment screw is as shown in the illustration.
2.
Brake shoe setting position
After adjusting the brake shoe position so that the shoe surface and the rim surface are as shown in the illustration, tighten the shoe fixing bolt.
FOR
WARD
Direction of rim rotation
Direction of rim rotation
Toe-in
0.5 mm
Note:
The BR-R451 / R450 allows the angle of contact between the shoe and the rim (toe-in) to be adjusted.
Adjusting the toe-in makes it possible to obtain smoother braking operation.
FOR
WARD
1 mm or more
Shoe fixing bolt
4 mm Allen key
Tightening torque:
5 – 7 N·m {43 – 61 in. lbs.}
3.
Cable connection
Set the quick release lever to the closed position; then adjust the shoe clearance (as shown in the illustration below) and secure the cable.
Cable bolt tightening torque:
6 – 8 N·m {52 – 69 in. lbs.}
4.
Centering of the brake shoe
Make a minor adjustment by using the centering adjustment screw.
2
Open
1
Centering adjustment screw
=
B
Closed
Quick release lever
2
1 2 1
5.
Readjustment of the shoe clearance
Turn the cable adjustment bolt to readjust the shoe clearance.
Cable adjustment bolt
3
4
=
B
4
3 3 4
6.
Check
Depress the brake lever about 10 times as far as the grip and check that everything is operating correctly and that the shoe clearance is correct before using the brakes.
Depress about
10 times
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-shi, Osaka 590-8577, Japan
* Service Instructions in further languages are available at : http://techdocs.shimano.com
Please note: specifications are subject to change for improvement without notice. (English)
© Jan. 2011 by Shimano Inc. XBC IZM Printed in Malaysia.
