SERVICE BRAKES GROAN AT END OF STOP - TM-10-3930-638-24-P0305

TM 10-3930-638-24&P

2-41. BRAKE SYSTEM TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

8. EXCESSIVE SERVICE BRAKE PEDAL EFFORT REQUIRED (cont)

Step 7. (cont)

Operate engine at 1700 to 1900 RPM. With lift control lever held towards you, note and record pres-

sure gage reading; then pump service brake pedal several times.

Depress service brake pedal and record new pressure gage reading.

Compare difference between pressure gage readings (relief pressure).

If difference between pressure gage readings is not 245 to 255 PSI replace or repair power assist

unit (para 2-43c(2)).

9. SERVICE BRAKES GROAN AT END OF STOP

Step 1. 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 applied.

WARNING

Before raising wheel 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 from ground.

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

Check brake linings for wear, uneven wear, brake fluid/lubricant contamination, or excessive dust

Repeat for other axle.

a. Replace brake linings if worn or contaminated: remove excessive dust (para 2-43a).

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

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

a. Replace brake drums if scored or cracked (para 2-39f).

b. If hub and drum assemblies are okay, proceed to step 3.

Step 3. Check for loose, missing, or damaged brake shoe mounting hardware (para 2-43a).

Replace missing or damaged brake shoe mounting hardware; install new hardware if missing.

10. SCRAPING NOISE FROM SERVICE BRAKES WHEN APPLIED

Step 1. 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 applied.