4-40. INTERNAL BRAKES (Cont)
REMOVE INTERNAL BRAKE ASSY
POSITION INTERNAL BRAKE ASSY
SECURE INTERNAL BRAKE ASSY
TO FLANGE OF AXLE WITH TEN
NUTS AND CAPSCREWS REMOVED
IN STEP 2.
CONNECT WHEEL CYLINDER HY-
DRAULIC LINE DISCONNECTED
IN STEP 1.
REMOVING OR INSTALLING
INTERNAL BRAKE ASSY
Figure 4-47. Internal brake assembly replacement (All models except M127) (Sheet 2 of 2)
(4) Wheel cylinder (All models except M127).
(a) Disconnect hydraulic lines on the back side of the brake backing plate (fig. 4-47, step 1).
(b) Remove wheel cylinder screws and Iockwashers which fasten the wheel cylinder to the brake
backing plate and remove wheel cylinder from backing plate.
(5) Internal brakes (All models except M127). Remove wheels from hub (fig. 4-24) and hub and
brake drum from axle (fig. 4-27); then remove the internal brakes by following procedures shown
(1) Brake shoes (Model M127).
(a) Coat anchor pins and anchor pin strap with light film of grease. Install shoes on anchor pins.
Install strap on anchor pins and secure with C-washers. Using brake shoe spring remover and
replacer, replace brake shoe tension spring.
(b) Loosen anchor pins by backing off anchor pin locknuts and turn anchor pins to give minimum
distance between ends of brake shoes at this point. Turn worm shaft of slack adjuster to give
minimum distance between roller ends of brake shoes.
(d) Adjust brakes (para. 4-39a(2)(b) ).
Brake shoes (M127A1, M127A1C, M128A1, M128A1C, M129A1, M129A1C).
(a) Install brake shoe on brake support, making sure that toe is aligned with the shoe adjusting
screw and the heel aligned with the slot in the anchor pin. Slip shoe guide pin through spider
and guide hole in shoe web. Install shoe guide pin washer and new shoe guide spring C-washer.
(b) Install brake shoe retracting springs.