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Thanks to everybody for the suggestions. I just capped off the PPV until i have the time to go through the accessories and find the leak.

Unfourtantly the unit is not near my shop or accessible with a service truck. I did a full air system inspection when the problem fist arose and the only air I could find leaking was through the smaller vent line. if i remove the accessory air circuit from the system, will i be able to move the...

ill look into that. Do you now if i can bypass that whole air circuit so i can build enough pressure to release the brakes? i dont want to bypass something that will cause a engine or driveline failure. is the fuel system on these trucks pressurized tank forward? if it is, does the accessory air...

I recently bought a BMY M923A2, drove it about 30 miles home and had no issues. Parked the unit for a few days and when I cranked it again it would not build air past 60psi. At 60-62psi I can hear air coming from the intake stack. I have verified that the air is coming from the center vent line...