TM 10-4610-239-24
TM 08580B-24/3
Table 2-2. Unit Troubleshooting - Continued
Malfunction
Test or Inspection
Corrective Action
AIRBRAKE SYSTEM - Continued
3. BRAKES DRAG OR REMAIN LOCKED
Step 1.
Check all compressed air system tubes, fittings, and components for leaking air.
If compressed air system is not losing pressure, repair relay valve.
Refer to
If compressed air tube or fitting is leaking air, repair air brake system tubing. Refer to
If coupling half is leaking air, repair airbrake hose assembly. Refer to paragraph 2-
49.
If brake line air filter is leaking air, repair brake line air filter. Refer to paragraph 2-
56.
If reservoir is leaking air, replace reservoir. Refer to paragraph 2-50.
If reservoir drain cock is leaking air, replace reservoir drain cock. Refer to paragraph
If air chamber assembly is leaking air, replace air chamber assembly.
Refer to
If airbrake relay valve is leaking air, repair airbrake relay valve. Refer to paragraph
4. TRAILER ROLLS WHEN DISCONNECTED FROM TOWING VEHICLE
Step 1.
Check all compressed air system tubes, fittings, and components for leaking air.
If compressed air system is not losing pressure, go to step 2.
If compressed air tube or fitting is leaking air, repair airbrake system tubing. Refer to
If coupling half is leaking air, repair airbrake hose assembly. Refer to paragraph 2-
49.
If brake line air filter is leaking air, repair brake line air filter. Refer to paragraph 2-
56.
If reservoir is leaking air, replace reservoir. Refer to paragraph 2-50.
If reservoir drain cock is leaking air, replace reservoir drain cock. Refer to paragraph
2-25
