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

66. SERVICE BRAKES DO NOT RESPOND WHEN APPLIED BY TRAILER BRAKE HAND CONTROL -

CONTINUED.

Check tractor protection valve (1) for damage or leaks by listening for hissing or

Step 3.

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

If valve is damaged or leaking, replace (page 4-878).

Check trailer brake valve (2) for damage or leaks by listening for hissing or using

Step 4.

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

If brake valve is damaged or leaking, replace (page 4-863).

Check hose no. 662 from tractor protection valve (1) to trailer brake valve (2)

Step 5.

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).

Check hose no. 054 from trailer brake valve (2) to tee (3) and hose no.611 for

Step 6.

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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