SERVICE BRAKES SQUEAK

TM 10-3930-638-24&P

2-41. BRAKE SYSTEM TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. SERVICE BRAKES GRAB (cont)

Step 6. Check wheel cylinders for leaking condition or sticking piston (para 2-43a, step 1).

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

b. If wheel cylinder is okay, reinstall hub and drum assemblies and axle shafts (para 2-39f), lower

axle and wheels to ground, remove shipping lock pin (store under operator's seat) and remove

blocks from wheels. Replace or repair hydraulic brake valve (para 2-43c).

5. SERVICE BRAKES SQUEAK

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

Step 1.

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 applied 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.

Remove axle shafts and hub drum assemblies (para 2-39f).

Check brake linings for wear, uneven wear, glaze, brake fluid or lubricant contamination, and/or exces-

sive dust.

Repeat for other axle and wheels.

a. Replace brake linings that are worn, glazed or contaminated; remove excessive dust (para 2-43a).

b. If brake linings are okay and there is no excessive dust, proceed to step 2.

Step 2. Check hub and drum assembly for scored condition (para 2-39f).

a. If hub and drum assembly is scored, replace brake drum (para 2-39f).

b. If hub and drum assembly is okay, check for damaged brake shoe return spring (para 2-43a);

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

6. SERVICE BRAKES OVERHEAT

Step 1.

Check brake pedal/return spring linkage for binding, interference, missing parts, or damage (para 2-43e).

a. If brake pedal/return spring linkage is binding, has interference, is missing parts or damaged, re-

pair or replace (para 2-43e).

b. If brake pedal/return spring are okay, proceed to step 2.