Quantcast 7.  TRAILER SERVICE BRAKES DO NOT APPLY WHEN HAND BRAKE VALVE IS OPERATED (CONT)

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Page Title: 7. TRAILER SERVICE BRAKES DO NOT APPLY WHEN HAND BRAKE VALVE IS OPERATED (CONT)
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FRONT DOUBLE CHECK VALVE (MIDDLE) TEST
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TM-9-2320-364-20-2 Truck Tractor Line Haul 52 000 GVWR 6x4 M915A2 Truck Tractor Light Equipment Transporter (Let) Manual
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TRACTOR PROTECTION VALVE TEST
TM 9-2320-364-20-2 2-1802 7.  TRAILER SERVICE BRAKES DO NOT APPLY WHEN HAND BRAKE VALVE IS OPERATED (CONT). Air lines free of crimps or leaks   and fittings, front double check   valve (middle) and gladhand   free of leaks. Hand brake valve OK. Front double check valve OK. Tractor protection valve OK. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Verify repair. If trailer service brakes apply when hand brake valve is operated, fault has been corrected. YES NO Fault not corrected. Notify DS Maintenance. 5. Do trailer service brakes apply when hand brake valve is operated? 4. Does tractor protection valve operate correctly? Replace tractor protection valve (Para 12-45). Verify repair, go to Step 5 of this Fault. YES NO Air lines free of crimps or leaks   and fittings, valves and   gladhand free  of leaks. Hand brake valve OK. Front double check valve   (middle) OK. Tractor protection valve faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Tractor protection valve test. If the tractor protection valve fails closed, air pressure will not be available to actuate the trailer service brake relay valves. WARNING Fault corrected. Read   WARNING on Page 2-1803

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