SEVERE PRESSURE DROP WHEN BRAKE PEDAL IS APPLIED OVER 25 PSI (172 KPA). cont'd

TM9-2320-270-20-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 11.

While assistant applies brake pedal, check pilot hose from rear axle service

brake relay valve (5) to treadle valve (6) for damage or leaks by listening for

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

If hose is leaking, release brakes and repair or replace hose

(page 4-609).

Step 12.

While assistant applies brake pedal, check treadle valve (6) for damage or

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

If treadle valve is damaged or leaking, release brakes and replace valve

(page 4-720).

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