[Richard]

So let's get up to speed on some of the fundamentals of the air system as used in the Newell world. The engine compressor supplies air from 90 to 120 psig. The governor talked about controls this. If you are goint to 130, I would think about putting in a new govenor. The 120 AUX pump is normall set at 70 to 90 psi, so it won't come on in normal operation of the coach. However, HWH has wired a bypass into the pump control system that turns the 120V pump ON when the leveling system calls for air. There is also a 12VDC pump that is set usually from 50 to 70 psi. Unlike the 120V Aux pump, it has a check valve that prevents it from airing up the entire coach. In your case it will pressurize the potty and the air doors.

Look for the switch for the 120 compressor either by the microwave or in the front cockpit. Sometimes there is a switch for the 12VDC pump in the bathroom. Convenient for flushing the potty.

Supply side to zero indicates a leak somewhere obviously. Brake side at 50 says your pressure protection valves are doing what they are supposed to. Their purpose is to prioritize air in the brake tanks. Most are set to maintain pressure at 60 psi. So the main leak is NOT in the brake system.

Have you put soapy water on all the connections you touched?