What is the aux air pressure doing? If t is dropping, the check valves on tank 1 and 2 as well as the protection valve at the aux tank could be bad. If it is holding ant the tanks 1 and 2 are dropping, then check the parking brake valve, the treadle valve.
I do not. They look to have nice units, they were outside of my price range.
are You going to have it inspected or you going yourself?
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