TM 10-4610-239-24
TM 08580B-24/3
Table 2-2. Unit Troubleshooting - Continued
Malfunction
Test or Inspection
Corrective Action
AIRBRAKE SYSTEM - Continued
4. TRAILER ROLLS WHEN DISCONNECTED FROM TOWING VEHICLE -- Continued
If airbrake relay valve is leaking air, repair airbrake relay valve. Refer to paragraph
2-
58.
Step 2.
Check that compressed air system tubes between reservoir and air chamber
assemblies are not crimped or crushed.
If compressed air system tubes are good, go to step 3.
If compressed air system tubes are damaged, repair airbrake system tubing. Refer to
Step 3.
Remove hub and drum assembly for each wheel (refer to paragraph 2-66). Inspect
brakeshoe linings for wear. Using 6-inch scale, measure brakeshoe lining thickness.
If brakeshoe linings are greater than 1/8 inch (3.2 ram) thick, adjust service brakes.
Refer to paragraph 2-73.
If brakeshoe linings are less than 1/8 inch (3.2 mm) thick, repair service brake
assembly. Refer to paragraph 2-72.
5. BRAKES SLIP
Remove hub and drum assembly for each wheel (refer to paragraph 2-66). Inspect
brakeshoe linings for wear, using 6-inch scale to measure brakeshoe lining for
thickness, and check for rusted or damaged brake parts.
If brakeshoe linings are less than 1/8 inch (3.2 mm) thick or brake parts are rusted or
damaged, repair service brake assembly. Refer to paragraph 2-72.
If brakeshoe linings are greater than 1/8 inch (3.2 mm) thick and brake parts are
good, adjust service brakes. Refer to paragraph 2-73.
2-26
