SERVICE BRAKES OVERHEAT

TM 10-3930-638-24&P

2-41. BRAKE SYSTEM TROUBLESHOOTING (cont.)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

6. SERVICE BRAKES OVERHEAT (cont)

Step 2.

Place blocks (6 by 6 by 18 inches wood blocks) at each wheel to prevent vehicle from moving.

Remove shipping lock pin from storage area under operator's seat (para 2-4b(1)) and install in chassis.

Ensure that parking brake is in released position.

WARNING

Before raising axle off ground, be sure that shipping lock pin is

installed. Failure to do so may cause vehicle to turn and slip off

jack or jack stands causing serious injury or death. If you are in-

jured by falling equipment, obtain medical aid immediately.

Raise one axle and wheels off ground.

Rotate wheel by hand: there should be a very slight dragon wheel.

Repeat above for remaining wheel and axle.

a. If there is a very slight drag on wheels, proceed to step 3.

b. If there is excessive dragon wheels, adjust brakes (para 2-43a).

Step 3. Remove axle shafts and hub and drum assemblies from one axle (para 2-39f).

Check brake shoe return spring (para 2-43a).

Repeat above for remaining axle.

a. If brake shoe return spring is permanently set, replace (para 2-43a).

b. If brake shoe return spring is okay, proceed to step 4.

Step 4. Check wheel cylinders for leaking condition or sticking piston (para 2-43a, step 1).

If wheel cylinder is leaking or piston is sticking, replace wheel cylinder (para 2-43a).

7. EXCESSIVE SERVICE BRAKE PEDAL TRAVEL

NOTE

If there is excessive brake pedal travel, add brake fluid to master

cylinder (para 2-43c(1)) and bleed air from brake system as de-

scribed in paragraph 2-43a. If brake pedal travel is still excessive

proceed to step 1 below.

Step 1. Check adjustment of service brake pedal free travel (para 2-43e).

a. If service brake pedal is not adjusted properly, adjust (para 2-43e).

b. If adjustment is okay, proceed to step 2.