Tom, as to your question of how long the Supply air stays up, there are so many variables that I don't think that there is a good answer. My coach has a several additional air operated items than yours and Richard's coach has several that mine does not have so each gives more opportunities to leak down. That said, the best mine has done is dropping from 95 psi to 75 psi (the cycle range of my 120 volt air compressor) in 12 hours. The worst was 14 minutes. Newell found a cracked ride height valve that was causing the 14 minute leak down. I probably average about 2-4 hours for a 20 psi leak down. I know I still have one fitting leaking going into my lumbar bladder control on my air seat. Hopefully after repairing that, I will be back to 3-5 hours. Newell considers that anything over 45 minutes on the air supply for a 20 psi leak down is not worth tracking down but I am certain that Wally disagrees with that. The brake system, of course, should stay up for days or even weeks.
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