TM 9-2320-272-24-1
Table 2-4. Compressed Air and Brake System Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
PARKING BRAKE
1. PARKING BRAKE DOES NOT HOLD VEHICLE ON GRADE
Test 1. Check parking brake adjustment.
a. Release spring brakes (TM 9-2320-272-10).
b. Turn knob (1) on parking brake lever (2) clockwise to increase braking action.
c. If adjustment does not correct malfunction, perform test 2.
Test 2. Inspect parking brake cable (3) for binding or breaks.
a. Replace cable (3) if binding or broken (para. 3-175).
b. If cable (3) is not damaged, perform test 3.
Test 3. Inspect parking brakeshoes (6) for wear.
a. Push brakeshoe lever (4) clockwise by hand and measure brakeshoe lever travel.
b. If travel is more than 2 in. (5) mm), replace parking brakeshoes (6) (para. 3-176).
Test 4. Inspect for broken or faulty actuating plate (7).
a. Move brakeshoe lever (4) back and forth. Observe operation of brakeshoe lever (4),
spring (5), and actuating plate (7).
b. If actuating mechanism is defective, notify DS maintenance.
c. If actuating mechanism is serviceable, perform malfunction 19.
END OF TESTING!
2. PARKING BRAKE DRAGS, AS INDICATED BY SMOKING OR BURNING SMELL
Ensure parking brake lever (2) is not partially engaged.
a. Fully release parking brake.
b. If parking brake still drags, perform malfunction 1, tests 1, 2, and 4.
END OF TESTING!
2-179
