SERVICE BRAKES DO NOT WORK WHEN TRUCK IS BEING TOWED

TM9-2320-270-20-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

68. SERVICE BRAKES DO NOT WORK WHEN TRUCK IS BEING TOWED.

NOTE

To carry out this procedure, truck must be hooked up to towing vehicle

(TM 9-2320-270-10).

Step 1.

Go to cab and check air pressure gage (1).

If gage shows operating pressure, of at least 60 psi (414 kPa) go to

step 7.

Step 2.

Check check valve (2) at reservoir (3) for damage or leaks by listening

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

If check valve is damaged or leaking, replace (page 4-826).

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