Service Brake Wheel Cylinder

TM 10-3930-630-12

TA034848

1 Slide assemblies

4 Lockwasher

2 Nylon washer

5 Screw

3 Washer

6 Nut

Figure 4-73. Brake adjuster, disassembly and assembly

(1) Install slide assemblies (1, Fig. 4-73) with

wheel cylinder.

nylon washers (2) between slides.

c. Installation.

(2) Secure slides with screws (5), nuts (6) and

(1) Install wheel cylinder (Fig. 4-72) on backing

washers (3 and 4). Tighten only finger tight.

plate.

(3) Move slides along slot until center-to-center

(2) Secure wheel cylinder to backing plate with

distance of holes in ends of slides is 5.15 inches (133.5

two screws (Fig. 4.74).

mm). Tighten screws (5) to a torque of 14 to 16 pound-

(3) Refer to paragraph 4-88 and install service

inches (1.58 to 1.80 N-m).

brake shoes and backing plate.

(4) Hold screws in position and tighten nuts (6)

(4) Refer to paragraph 4-85 and install front

to a torque of 29 pound-inches (3.2 N-m).

wheels.

(5) Check slip resistance of slide assemblies.

(5) Refer to & below and bleed brake system.

d. Bleeding Brake Hydraulic System. Each time

Resistance should be 250 to 300 pounds (113 to 135

kg).

the system has been drained and refilled or a part-has

(6) Install wheel cylinder links (Fig. 4-72) on

been disconnected or replaced the system must be bled.

bottom of brake shoes and secure with pins.

(1) Remove filler cap from master cylinder and

(7) Install adjuster assembly (Fig. 4-72) on

fill to proper level (0.375 to 0.50 inch (9.5 to 12.7 mm)

brake shoes and secure to brake shoes with spring pins

from top).

(fig. 4-72).

(2) Connect a bleeder hose to bleeder screw

(8) Install brake shoes (Fig. 4-72) on backing

(fig. 4-74) on front wheel. Submerge other end of hose

plate, with links installed in ends of wheel cylinder (fig.

in a glass jar filled with brake fluid.

4-72). Hold shoes in position with three return springs

(3) Open bleeder screw one turn.

(Fig. 4-72).

(4) Slowly depress brake pedal to end of travel

(9) Install dust shield (Fig. 4-71) on axle and

and release pedal Repeat several times. Observe hose

secure with four screws and lockwashers.

in jar and repeat pumping of brake pedal until no

(10) Refer to paragraph 4-85 and install front

bubbles escape from hose. Hold pedal at bottom of

drive wheels.

travel and close bleeder screw to keep additional air

from entering system.

4-89. Service Brake Wheel Cylinder

a. Inspection.

NOTE

Refer to paragraph 4-88 and

remove front wheel and dust shield. Inspect wheel

cylinder for leaks, damage and proper link movement.

While pumping pedal check fluid level in master

Replace wheel cylinder if necessary.

cylinder. Add fluid to keep cylinder close to full

b. Removal

at all times.

(1) Refer to paragraph 488 and remove brake

shoes

(5) Close bleeder screw and disconnect hoses

(2) Disconnect hydraulic brake line (Fig. 4-74)

Repeat operation on bleeder screw on other front wheel

from fitting in wheel cylinder.

(6) Fill master cylinder to proper level after

(3) Remove two screws and lockwashers

bleeding operation. Install filler cap.

securing wheel cylinder to backing plate and remove

4-81