SCRAPING NOISE FROM SERVICE BRAKES WHEN APPLIED

TM 10-3930-638-24&P

2-41. BRAKE SYSTEM TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

10. SCRAPING NOISE FROM SERVICE BRAKES WHEN APPLIED (cont)

Step 1. (cont)

WARNING

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

installed. Failure to do so may cause vehicle to slip off jack or

jack stands causing serious injury or death. If you are injured by

falling equipment, obtain medical aid immediately.

Raise one axle and wheels off ground.

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

Check brake linings for wear, uneven wear, brake fluid/lubricant contamination (para 2-43a).

Repeat for other axle.

a. Replace brake linings if worn or contaminated (para 2-43a).

b. if brake linings are okay, proceed to step 2.

Step 2. Check brake shoe return springs for damage (para 2-43a).

a. Replace spring if damaged (para 2-43a).

b. If spring is okay, check brake assemblies for loose or missing brake shoe mounting hardware;

tighten/replace brake shoe mounting hardware (para 2-43a).

11. STOP LIGHT INOPERATIVE

Refer to paragraph 2-24, MALFUNCTION 4 for troubleshooting procedures.

12. DECLUTCH PEDAL DOES NOT NEUTRALIZE TRANSMISSION

Disconnect center propeller shaft from brake flange (para 2-39). Block wheels, lightly apply parking brake,

and idle engine. Observe transmission output shaft (brake flange) while an assistant depresses service brake

pedal.

a. If brake flange stops rotating, check adjustment of declutch valve (para 2-43d). If adjustment

is correct, replace declutch valve (para 2-43d).

b. If brake flange does not stop rotating, replace transmission control valve assembly (notify direct

support maintenance).