SERVICE BRAKES DO NOT WORK WHEN TRUCK IS BEING TOWED CONTINUED

TM9-2320-270-20-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Check quick release valve (5) for damage, clogs, or leaks by listening

Step 9.

for hissing or using soap solution and watching for bubbles (page 4-1).

If quick release valve is damaged, clogged, or leaking, clean or

replace (page 4-829).

Step 10.

Check hose (6) from quick release valve (5) to tandem axle service

brake relay (7) for damage or leaks by listening for hissing or using

soap solution and watching for bubbles (page 4-1).

If hose is damaged or leaking, repair or replace (page 4-609).

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