TM 9-2320-363-20-1
Table 3-1. Troubleshooting (Cont)
Malfunction
Test or inspection
Corrective action
BRAKES (CONT)
Step 2.
Check that foot valve returns to fully released position.
Remove any debris interfering with pedal travel, or adjust stop
bolt (page 4-403).
Step 3.
Check exhaust ports on brake foot valve, quick release valve, and gladhand vent
holes for blockage.
Clear exhaust port(s) and vents of obstructions.
Step 4.
Check for weak or broken brakeshoe return springs.
Replace weak or broken springs (pages 4-407 thru 4-417).
Step 5.
Check for frozen brakeshoe anchor pins.
Clean and lubricate sticking pins or replace if damaged
(pages 4-407 thru 4-417).
Step 6.
Check for broken spring in air chamber.
Replace air chamber (pages 4-420, 4-422, 4-424).
3. BRAKES ARE UNEVEN, DRAG, OR PULL WHEN APPLIED.
Step 1.
Check for uneven adjustment between axles.
Adjust brakes (pages 4-446, 4-448, 4-450).
Step 2.
Check for proper wheel bearing adjustment.
Adjust wheel bearings (pages 4-584 thru 4-599).
Step 3.
Check for grease-saturated or worn linings.
Replace linings (pages 4-407 thru 4-417).
Step 4.
Check for out-of-round brakedrum(s).
Replace brakedrum(s) (pages 4-584 thru 4-599).
Step 5.
Check for worn S-cam or roller.
Replace S-cam or roller (pages 4-446, 4-448, 4-450).
4. ABS INDICATOR LIGHT STAYS ON AFTER VEHICLE REACHES 4-5 MPH.
Step 1.
Perform ABS troubleshooting procedures using tester (page 3-93).
Step 2.
Check for proper wheel bearing adjustment.
Adjust wheel bearings as required (pages 4-584 thru 4-599).
3-86 Change 3
