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

67. SEVERE PRESSURE DROP WHEN BRAKE PEDAL IS APPLIED OVER 25 PSI (172 KPA) -

CONTINUED.

While assistant applies brake pedal, check four hoses (1) from spring brake

Step 5.

relay valve (2) to rear axle brake chambers (3) for damage or leaks by

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

If hoses are damaged or leaking, release brakes and replace or repair

hoses (page 4-609).

While assistant applies brake pedal, check spring brake relay valve (2) for

Step 6.

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

for bubbles (page 4-1).

If spring brake relay valve is damaged or leaking, release brakes and

replace valve (page 4-796).

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