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 two hoses (1) from pusher axle relay

Step 9.

valve (2) to pusher axle brake chambers (3) and two jumper hoses (4) between

chambers 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 pusher axle relay valve (2) and pilot

Step 10.

hose no. 636 from pusher axle relay valve (2) to tandem axle service brake

relay valve (5) for damage or leaks by listening for hissing or using soap

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

If pusher axle relay valve or pilot hose is leaking, release brakes and

repair or replace valve or hose (page 4-609).

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