TM 9-2330-285-14&P/TO 36A11-21-10-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. SERVICE BRAKES DO NOT HOLD ON FRONT AND REAR DOLLIES
Step 1.
Check air system up to the relay valve.
a. Loosen air line (1) slightly at the relay valve (2). If air
escapes, tighten line (1) and go on to (b). If no air escapes,
repair restricted emergency line (1).
b. Loosen air line (3) slightly at the relay valve. Apply brakes on
towing vehicle. If air escapes from line (3), tighten and go to
step 2. If no air escapes, repair restricted service line (3).
Step 2. Check relay valve.
Loosen air line (4) slightly at the relay valve. Apply brakes on
towing vehicle. If air escapes, repair restricted brake chamber
TA 221658
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