Shimano ST-M952 Shifting/Brake Lever Service Instructions

 /\\ WARNING
e 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.
e The M951 brake system is equipped with a pitch adjusting screw in
the wire hooking unit of the ST-M952 / BL-M950 brake levers which
allows the rider to change the relationship between the brake input
and output. If the pitch adjustment screw is turned clockwise, the
braking force will be dramatically increased, so that a high level of
braking performance can be achieved from only a small amount of
lever movement. Accordingly, normal braking operation may cause a
greater-than-expected amount of braking force to be applied, which
could make the bicycle fall forward, causing serious injury to the
rider. To avoid this, please read the following instructions thoroughly
before turning the pitch adjusting screw clockwise.
After removing the pitch fixing block, make sure
that you are completely used to the new braking
characteristics before riding the bicycle,
otherwise the bicycle might fall forward if you
have to apply the brakes suddenly, such as
when a vehicle appears.
1) With the pitch fixing block in place (standard
specifications for shipment)
2) With the pitch fixing block removed and the pitch
adjusting screw tightened to the position in the
illustration
An ample degree of braking force can be obtained from a small
amount of brake lever input, to provide a high level of brake
performance. However, if the brakes are operated suddenly, there
is the danger that the bicycle may fall forward. After removing the
pitch fixing block and turning the pitch adjusting screw clockwise,
first ride the bicycle at a speed of less than 6 mph (10 km/h) while
applying the brakes repeatedly in order to get a feel for the
difference in braking characteristics before riding at higher
speeds. Beginners should be particularly careful.
3) With the pitch adjusting screw fully tightened
An ample degree of braking force can be obtained from an even
smaller amount of brake lever input than in 2) above, to provide
the highest level of brake performance. However, because the
braking force is even more sensitive to the amount of lever input
than in 2), be sure to practice using the brakes as described
above, Beginners or those who are not fully confident should not
use the brakes in this configuration
Pitch adjusting screw
* Use the BR-M951 V-brake with SERVO WAVE
ACTION and adjustable V-brake-compatible
levers such as the BL-M950/ST-M952/ST-M951/
BlL-M739/ST-M739/BL-M601 brake levers.
SERVICE INSTRUCTIONS
Multi-Condition
SI-B660A
Brake System
Before use, read these instructions carefully, and follow them for correct use.
Multi-Condition Brake System
By providing superior wet weather braking performance (control
and modulation), braking performance will not vary in a multitude of
conditions when using this brake system
In order to realize the best performance, we recommend that the fol-
lowing combination be used
Series XTR
Brake lever ________ST-M952 / BL-M950
V-brake BR-M951 =
Brake cable (EL
NOTE:
® By using these parts as a set, the optimum efficiency of the Multi-
Condition Brake System can be realized
e For any questions regarding methods of handling or maintenance,
please contact the place of purchase.
Installation of the brake lever
Move lever (A) so that the clamp bolt can be seen, and then use a 4
mm Allen key to install the brake lever
Insert the 4 mm Allen key so that 4 mm Allen key
it goes as far into the head of the ъ
bolt as possible at this time.
” Tightening = 4
Clamp bolt
6-8 Nm
152 — 69 In. lbs.)
Use a handlebar grip with a
maximum outer diameter of
32 mm,
Installation of the V-brake
1 Insert the stopper pin of the brake body into the center spring hole
* in the frame mounting boss, and then secure the brake body to the
frame with the link fixing bolt.
Tightening torque:
5 — 7 Nm {43 — 61 in. Ibs.}
5 mm Allen key
Washar
Link fixing bolt
Stopper pin
Spring hole
A.
2 While holding the shoe against the rim, adjust the amount of shoe
" protrusion by changing over the washer B (6 mm or 3 mm) so that
dimension A is kept at 39 mm or more,
{Lo
cl \
Г
6 mm washer B 3 mm washer B
Shoe fixing nut
BE +
\ Washer
Washer A | Washer A
Shoe fixing link
3 While holding the shoe against the rim, tighten the shoe fixing nut
| Tightening torque:
6 - 8 Nm {52 - 69 In. Ibs.}
5 mm Allen key
4 Pass the inner cable through the inner cable lead, and after setting
" so that the total of the clearances between the left and right shoes
and the rim is 2 mm, tighten the cable fixing bolt
В Ce torque:
6 — 8 Nm (52 — 69 In. Ibs.)
Inner cable lead 5 mm Allen key
5 Adjust the balance with the spring tension adjustment screws,
Spring tension
adjustment screw
Spring tension
adjustment screw
6 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.
f)
—
= NU Depress about
10 times
Replacement of the cartridge shoe
1 Remove the shoe fixing pin
3 There are two different types of shoe and shoe holder to be used
"in the left and right positions respectively. Slide the new shoes into
the grooves on the shoe holders while taking note of the correct
directions and pin hole positions.
[_ Fortheleft | [
| Same at front and rear | Same at front and rear |
(From
Shoe Shoe
Shos holder Shoe holder
ve à E
For the right |
Shoe
insertion
direction
10
Shoe fixing pin
Shoe fixing pin
4 Insertion of shoe fixing pin is very critical to keep shoe properly
" fixed in place.
Please nole: Specificalions are subject 10 change for improvement withoul nolice. (English)
® {AY These service instruclions are
| Mm a MN O e prinled on recycled paper and
can be recycled again.
SHIMANO AMERICAN CORPORATION
One Holland Irving CA 92618 U.S A Phone 714-951-5003
SHIMANO EUROPA
Industrieweg 24 NL-8071 CT Nunspeel, Holland Phone 31-3412-72222
SHIMANO INC.
3-77 Oimatsucho, Sakai, Osaka, Japan Phone 0722-23-3243
© Mar. 1998 by Shimano Inc. PIT. 17M. Printed in Japan