General Safety Information
Technical Service Instructions SI-8JY0A-002
– To avoid serious injuries:
Applicable brake
The V indicates the mode
position for compatibility with
V-BRAKE brakes.
• V-BRAKE brakes
Make a minor adjustment by using the centering adjustment
Centering adjustment
22 mm
Caliper Brake
3 mm Allen key
In order to realize the best performance, we recommend
that the following combination be used.
Brake lever
ST-4600 / ST-4603, BL-4600 / BL-R780
Caliper Brake
1. Installation of the brake itself
Compress the arch‚ and set while the shoe is in firm contact
with the rim.
Quick release lever
Tightening torque:
8 – 10 N·m {69 – 87 in. lbs.}
Installation of the brake lever
1. Installation to the handlebar
<ST-4600 / 4603>
Installation of the brake
Then wrap the handlebar with handlebar tape.
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
C/R position
5. Readjustment of the shoe clearance
5 mm Allen key
<BL-4600 / R780>
Secure the assembly with the installation nut on the outside of
the bracket. Pull the bracket cover back and use a 5 mm Allen
key to tighten the bolt.
The C indicates the mode
position for compatibility with
caliper brakes and cantilever
The R indicates the mode
position for compatibility with
roller brakes.
2 mm Allen key
Outer casing
Brake cable
V position
4. Centering of the brake shoe
<BL-4600 / R780>
5.6 mm
• 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.
• The BL-4600/BL-R780 brake levers are equipped with a mode switching
mechanism to make them compatible with V-BRAKE brakes, caliper brakes,
cantilever brakes and roller brakes.
If the incorrect mode is selected it may cause either excessive or
insufficient braking force to occur, which could result in dangerous
accidents. Be sure to select the mode in accordance with the
instructions given in the mode switching table.
Mode position
Temporarily secure the outer casing to the handlebar (by using
tape or similar material).
Turn the cable adjustment bolt to readjust the shoe clearance.
• Mode switching
Cable hook
Outer casing
C/R position
Inner cable drum
Cable adjustment bolt
Bracket cover
• Caliper brakes
• Cantilever brakes
• Roller brakes
The usual position during
installation is when the head
of the centering adjustment
screw is as shown in the
5 mm Allen key
• If the front brake is applied too strongly, the wheel may lock and the bicycle
may fall forward, and serious injury may result.
• Use the ST-4600/4603, BL-4600/R780 with the BR-4600. Do not use the BR4600 in combination with previous STI levers for road riding or with the BLR770/BL-R550 brake levers for flat handlebars, otherwise the braking
performance provided will be much too strong.
• Securely tighten the caliper brake mounting nuts to the specified tightening
· 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
• 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 the Service Instructions for the Brake Systems carefully before use.
• Read these Technical Service Instructions carefully, and keep them in a safe
place for later reference.
Outer casing
Cable hook
Installation nut
Tightening torque:
6 – 8 N·m {52 – 69 in. lbs.}
Inner cable drum
<BL-4600 / R780>
Use a 4 mm Allen key to install.
6. Check
2. Brake shoe setting position
Tightening torque:
6 - 8 N·m {53 - 69 in. lbs.}
4 mm Allen key
3. Lever stroke adjustment
<ST-4600 / 4603>
Pad spacer (A)
Use a handlebar grip with a
maximum outer diameter of
32 mm.
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.
Pad spacers (A) + (B)
Direction of
rim rotation
When installing the components to carbon frame/handle bar
surfaces, verify with the manufacturer of the carbon frame/parts
for their recommendation on tightening torque in order to
prevent over tightening that can cause damage to the carbon
material and/or under tightening that can cause lack of fixing
strength for the components.
0.5 mm
Tilt the lever in (as when shifting) to make it easier to pass the
cable through the cable hook.
7.5 mm
14 mm
The BR-4600 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.
<BL-4600 / R780>
Depress about
10 times
Pad spacer (A)
Note: The front lever cannot be tilted
to the inside until lever F
b is
pushed once or twice.
Pad spacer (A)
• 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.
<ST-4600 / 4603>
Direction of
rim rotation
Depress about
10 times
Initial condition:
2. Installation of the brake cable
<ST-4600 / 4603>
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.
1 mm or more
Shoe fixing bolt
Lever F
Pad spacer (B)
Bump rubber
4 mm Allen key
Pass the inner cable through as shown in the illustration, and
then set the inner cable drum into the cable hook.
Cable hook
• To increase the lever
• To decrease the lever
Remove the pad spacer (A)
and install the bump rubber.
Insert pad spacer (B) as far as
it will go and so that the
projections fit into the holes in
pad spacer (A).
* Apply a small amount of grease to the projections when installing
the pad spacer and the bump rubber.
Inner cable drum
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.}
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 :
Please note: specifications are subject to change for improvement without notice. (English)
© Mar. 2011 by Shimano Inc. XBC IZM Printed in Malaysia.
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