SERVICE BRAKES DO NOT RESPOND WHEN APPLIED BY TRAILER BRAKE HAND CONTROL cont'd

TM9-2320-270-20-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 7.

Check trailer brake hand control valve (4) for damage or leaks by listening

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

If control valve is damaged or leaking replace (page 4-868.

Step 8.

Check hose no. 663 from hand control valve (4) to tractor protection valve (1) for

damage or leaks by listening for hissing or using soap solution and watching

for bubbles (page 4-1).

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

b. If hose is not damaged or leaking, troubleshoot trailer.

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