TM 9-2320-273-20
Table 9-1. Compressed Air and Brake System Troubleshooting Procedures (Continued).
MALFUNCTION .
TEST OR INSPECTION.
CORRECTIVE ACTION.
12. REAR SERVICE BRAKES ARE UNEVEN OR ERRATIC (Continued):
Step 2.
Check for air leakage between the air reservoir and the rear service brake relay valve.
Tighten loose connections or replace damaged line.
Step 3.
Leak test rear brake part of the brake pedal valve.
Tighten loose connections or replace pedal valve (para 9-21).
Step 4.
Check brake shoes for proper adjustment.
Adjust brake shoes (para 9-39).
13. SERVICE BRAKES ARE UNEVEN OR ERRATIC ON ONE OR MORE WHEELS:
Step 1.
Have an assistant press and hold the brake pedal valve down and perform leakage
test on air lines at affected wheels using a soap solution.
Tighten loose connections, repair or replace damaged air lines or hoses.
Step 2.
Loosen line fitting at affected wheel air chamber and have an assistant lightly depress
the treadle valve, Listen for air exhausting from line. No air indicates a clogged line.
Replace damaged or clogged line.
Step 3.
Check brake adjustment (para 9-31,9-32, 9-39):
a.
Adjust brake and schedule for maintenance as soon as possible.
b.
If manual adjustment does not correct the problem, refer problem to
Direct Support Maintenance.
Step 4.
Press brake pedal down and listen for air leakage around wheel air chamber clamp.
Tighten clamp or replace ruptured chamber diaphragm (para 9-36 for front
brakes, para 9-37 for rear brakes).
Step 5.
Remove hub and drum assembly to inspect plunger and adjuster mechanism and brake
return springs (para 9-31 and 9-32 for front brakes, para 9-33 and 9-34 for rear brakes).
Clean, repair or replace defective components.
Step 6.
Check the brake linings for grease, glazing and proper installation (para 9-31 and 9-32
for front brakes, para 9-33 and 9-34 for rear brakes).
Clean, replace, or reinstall as required.
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