TM 9-2320-260-20
Table 2-3. Compressed Air and Air-Hydraulic Brake System Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
PARKING BRAKE
1. PARKING BRAKE DOES NOT HOLD VEHICLE
Step 1. Check parking brake lever position.
If partially applied, pull to full brake position (TM 9-2320-260-10).
Step 2. Check parking brake adjustment (para. 8-5).
If adjustment does not solve problem, perform step 5.
Step 3. Inspect parking brake cable for binding or breaks.
Replace parking brake cable if bound or broken (para. 8-3).
Step 4. Check parking brakeshoe lever movement.
a. Direct assistant to pull and release parking brake lever (TM 9-2320-260-10).
b. If parking brakeshoe lever movement is restricted, lubricate brakeshoe lever as required
LO 9-2320-260-12).
c. Replace parking brakeshoe lever if restricted movement continues (para. 8-2).
Step 5. Inspect parking brakeshoes for wear, contamination, and damage.
Replace parking brakeshoes if worn, contaminated, or damaged (para. 8-4).
Step 6. Check parking brakedrum for wear and damage.
Replace parking brakedrum if worn or damaged (para. 8-6).
END OF TESTING!
2. PARKING BRAKE DRAGS AND/OR OVERHEATS
Step 1. Check parking brake lever position.
If applied, fully disengage parking brake (TM 9-2320-260-10).
Step 2. Inspect parking brake cable for binding, kinks, and breaks.
Replace parking brake cable if bound, kinked, or broken (para. 8-3).
Step 3. Check parking brake adjustment (para. 8-5).
If adjustment does not solve problem, perform step 3.
Step 4. Inspect brakeshoe lever retracting spring for wear and damage.
Replace lever retracting spring if worn or darnaged (para. 8-4).
Step 5. Check parking brakeshoe lever adjustment.
a. Direct assistant to pull and release parking brake lever (TM 9-2320-260-10).
b. If parking brakeshoe lever movement is restricted, lubricate brakeshoe lever as required
(LO 9-2320-260-12).
c. Replace parking brakeshoe lever if restricted movement continues (para. 8-4).
END OF TESTING!
AIR-HYDRAULIC BRAKE SYSTEM
3. INSUFFICIENT BRAKES (NO APPARENT AIR SYSTEM FAILURE, AIR GAGE AT NORMAL PRESSURE,
WARNING BUZZER NOT SOUNDING)
Step 1. Check service brake adjustment (para. 8-9).
If adjustment does not solve problem, perform step 2.
Step 2. Inspect service brakeshoes for wear.
Replace brakeshoes if worn (para. 8-8).
2-90
