here is my update, after the left rear caliper got too hot and replacement of caliper, pads, brake line, seal, abs sensor and rotor the brakes worked fine for a couple weeks. I bought a new caliper and pads for the right rear and had them installed so I was sure this wheel would not get hot any longer. Drove the coach for about 10 miles and sure enough I could smell burning brakes again, but I stopped as soon as I could. it turned out that the right rear brake line collapsed causing this problem, so it may be the brake line all along. Compressed air would go through the old line a little bit in one way direction but was almost no air flow in the opposite direction. anyway I am happy with no more brakes dragging and got the coach all fixed up the way we want it. Time to go camping again.
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