[ron skeen]

You had some great diagrams of the air system.

We want to know for sure which tank is the supply tank.  That is the tank that appears to be leaking air from.  The brake supply air pressure gauge does not go down.  

We have two tanks in front of coach and one or two tanks in the rear of the coach.  

Can you help us out with that?

The two front tanks are the front and rear brake supply. The big tank in rear is the supply tank. The small tank in rear wheel well is for the air doors and commode.

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On my 96 all the air went through the supply tank first and then to the brake tanks which were protected by one way valves.