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I have a M1083 truck with a brake/air issue. Not quite my area of expertise and I could not find my specific issue in the TM troubleshooting. The brakes do function and the truck can be driven, but when I step on the brake pedal, air flows out the front blue service air gladhand at a decent rate. Regardless of the dash brake control valve or trailer valve position. I replaced the check valve behind the bumper with no change. I was thinking tractor protection valve but I thought it didnt get air unless the dash brake release was pushed. Usually when the tractor valve is bad air leaks out of all the gladhands. I am also wondering of the treadle valve could be bad and air is leaking thru it somehow. Since it always has air regardless of dash valves. Any input would be appreciated.
Will
Will