[PiperP2000]

We had the exact same issue on Coach 1241. I replaced the water separator as it was leaking through a crack in the clear filter bowl. I was also able to rebuild both of our compressors with a Thomas rebuild kit that made a big difference in their performance. The compressors would typically run for about 90 seconds to 2 minutes before cutting off. Now they run for about 15 seconds before cutting off. The kit is about $150 and includes new pistons/seals and cylinder liners.

Thomas p/n: SK2668T (from usathomas.com)