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I copied and pasted your questions below:
I’m confused. While the parking brake is engaged and the engine running, I build pressure in the Front, Rear and Aux systems. Overnight, say 10 hours, the Front and Rear air pressures do not drop at all and the Aux system drops 20psi.
Mike-This means your Suspension Norgrens (air bags) are holding air but you have a leak somewhere else in your system that uses aux air.
When I start up the bus and I release (turn off) the parking brake, in neutral and the engine running, I loose air pressure in all three systems quickly.
Mike- Not related to the previous question, this leak is in your brake system
In a matter of maybe 60 second the Front, Rear and Aux systems will drop from 117psi to 96psi with my foot on the regular brake. I take my foot off the brake, still in neutral, the engine running, and all three systems quickly drop to 88psi, then 77psi and the parking brake light comes on.
Mike-Aux and Brakes are 2 different system, you have leaks in both systems.
Still in neutral, no brakes applied, I run the engine rpms up and no air pressure will build up.
Only when I engage the parking brake will air pressure build up and it builds up quickly.Mike-Same answer as previous, you have a leak which should be substantial enough to hear.
What happens in the Front, Rear and Aux systems when the parking brake is engaged and what happens when the parking brake is disengaged ?
Mike-They have nothing to do with each other, two independent systems. It is going to be hard for you to hear these with the engine running, plug a compressor into your port in the back above the batteries, you should be able to hear a leak that is dropping that quick.