TM9-2330-368-14 & P
Table 4-2. Troubleshooting Table (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
BRAKES
1. BRAKES WILL NOT RELEASE.
Step 1.
Check operation of air brake chambers (Table 2-1).
a. If one air brake chamber does not release, replace defective brake chamber.
b. If all air brake chambers do not release, proceed to step 2.
Step 2.
Check operation of parking brake control (Table 2-1).
a. If parking brake control does not operate, replace parking brake control.
b. If replacing parking brake control does not correct the defect, proceed to step 3.
Step 3.
Check trailer valve operation for application of emergency air to air brake chambers.
If emergency air is not being applied to air brake chambers, replace trailer valve,
2. NO BRAKES OR WEAK BRAKES.
Step 1.
Check for low air pressure (leakage at connection, air lines or valves) (Table 2-1).
a. If air lines/connections are leaking, repair or replace as needed,
b. If valve is leaking, replace defective valve.
c. If air lines connections or valves are not leaking, proceed to step 2.
Step 2.
Inspect for grease on brake lining.
a. If grease is present on brake linings, replace defective oil seals and brake shoes.
b. If grease is not present on brake lining, proceed to step 3.
Step 3.
Check for worn brake lining (Table 4-1).
a. If brake lining is worn, replace brake shoe.
b. If brake lining is not worn, proceed to step 4.
Step 4.
Check brake adjustment (para. 4-15c).
a. Adjust brake shoes if out of adjustment.
b. If brakes are adjusted, proceed to step 5.
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