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Check the air dryer. Ours was leaking out bottom purge vent. Had to do rebuild on it. But same problems you listed. Wouldn't build air or it would drop air rapidly.

We had a similar issue with our 925. It was dumping air thru intake when parking brake was released. Had to cage spring brakes just to drive it. Service brakes seemed to work. Finally discovered problem, it was the double check valve under drivers step. Piece of sand got in there and stop the...