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Yup. Usually cracked diaphragms. The haldex rebuild kit is around 30 bucks. I can't remember the number it's posted somewhere.

The tractor valve prevents air dumping. I have never stood back there while someone pushed the trailer control. Before you go crazy you should check the 3 valves under the drivers foot area. I had a truck that had all 3 bad, bad treadle valve and a bad tractor valve. Wouldn't build air at all...

I believe the tractor protection valve should prevent air from free venting from the rear gladhands. I have seen rear anti compounding valves stick. The tm does have a flow chart for that. If is a new problem the tm troubleshooting should work. Whenever I get a truck it it's usually 2 lines...