Thank you very much for the suggestions. I had read in other forums that parking / storing for long periods of time with the parking brake on can cause it to lock up. I have engaged the park brake on and off several times to no avail. We never fully pressurize to 120 PSI gets to about 80. As soon as I cut the coach off the air pressure drops quickly and difficult to find due the short period of time before it stops. I didn't want to be under the coach long while running. The strange thing is everything was functional prior to parking. I thought there may be a specific valve for the parking brake (other than the plunger) that may be stuck open?
