TM 9-2320-273-20
Table 9-1. Compressed Air and Brake System Troubleshooting Procedures (Continued).
MALFUNCTION.
TEST OR INSPECTION.
CORRECTIVE ACTION.
9. PARK BRAKES WILL NOT APPLY (Continued):
Step 2.
Check air chambers for proper position of caging bolt.
Adjust caging bolt (Para 9-37).
10. SERVICE BRAKES ARE WEAK OR SLOW RESPONDING (ALL WHEELS):
Step 1.
Check for low reservoir pressure. Pressure should not be below 80 Ibs. (Buzzer
sounds at 80 Ibs).
See Malfunction 1.
Step 2.
Check service air lines for damage and leakage using a soap solution.
Tighten loose connections and replace damaged lines.
Step 3.
Check brake linings and adjustment (para 9-31, 9-32, 9-33, 9-34, 9-35).
Replace brake linings and/or adjust as necessary.
11. FRONT SERVICE BRAKES ARE WEAK OR SLOW RESPONDING:
Step 1.
Check air lines between brake pedal valve and front brake chambers for damage and
leakage using a soap solution.
Tighten loose connections and replace damaged lines.
Step 2.
Check the limiting valve for damage and leakage using a soap solution.
Replace defective limiting valve (para 9-25).
Step 3.
Check the brake pedal valve for damage and leakage using a soap solution.
Replace defective valve (para 9-21).
Step 4.
Check front brakes for worn linings (shoes) and proper adjustment.
Adjust brakes and replace linings if necessary (para 9-31, 9-32).
12. REAR SERVICE BRAKES ARE UNEVEN OR ERRATIC:
Step 1.
Check for leakage in air lines between service brake relay valve and wheel air chambers
using a soap solution.
Tighten loose connections or replace defective components.
9-6
