TM 9-2320-272-24-1
Table 2-4. Compressed Air and Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
19. SPRING BRAKES DO NOT SET (GAUGES AT NORMAL OPERATING PRESSURES, AIR EXHAUSTING NOT
HEARD WHEN PARKING BRAKE APPLIED)
Test 1. Ensure spring brake release control (1) is not out.
Test 2. Ensure parking brake is fully applied.
Test 3. Inspect for crimping in air lines (3) on quick-release valve (2).
a. Replace air line(s) (3) if crimped.
b. If no damage to lines (3) is apparent, perform test 4.
Test 4. Check parking brake valve (4).
Step 1. Disconnect vent line (6) from parking brake valve vent port (5).
Step 2. With engine running and parking brake released, apply parking brake.
Step 3. Feel for air venting through parking brake valve vent port (5).
a. If escaping air is present, replace parking brake valve (4) (para. 3-194).
b. If escaping air is not present, replace quick-release valve (2) (para. 3-216).
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