Figure 4-20. Service brake system bleeder screw.

TM 10-3930-631-12

CAUTION

Discard fluid salvaged from brake

system during bleeding operation. Do

not use in system.

4-34. Service Brake Brake Shoes

a. General. The service brake brake shoes are

mounted behind the dust shield. The shoes are attached

to the wheel cylinders and return springs. The brakes

are self-adjusting.

b. Removal.

(1) Refer to paragraph 4-37 and remove the

front drive wheel and tire assembly.

(2) Refer to figure 4-21 and remove brake

dust shield as follows:

Figure 4-20. Service brake system bleeder screw.

(3) Open the bleeder screw one turn.

(4) Slowly depress brake pedal to end of

travel and release pedal.

Repeat several times.

Observe hose in jar and repeat pumping of brake pedal

until no air bubbles escape from hose. Hold pedal at

bottom of travel and close bleeder screw to keep

additional air from entering system.

NOTE

Figure 4-21. Service brake dust shield, installed view.

While pumping pedal check fluid level in

master cylinder.

Add fluid to keep

(a) Remove four screws and lock washers

cylinder as close to full as possible at all

securing dust' shield to axle. Remove wheel bearing

times.

from axle.

(b) Carefully remove dust shield from around

(5) Close bleeder screw and disconnect

axle pinion.

hose. Repeat operation on bleeder screw on other front

(3) Refer to figure 4-22 and remove brake

wheel.

shoes as follows:

(6) Fill master cylinder to proper level after

(a) Disconnect three springs from brake

bleeding operation. Replace filler cap.

shoes.

4-26