[Jrahn56]

I have coach #375, after running at high idle for 30 minutes I have only 70 psi built up in brakes and supply. When I shut the engine I immediately lost my supply pressure with 3 minutes. I have drained all the tanks I could find, but that was 1 for the 12v compressor,  1 in the cross member by drive axle, and the brake tank that had a considerable amount of water built up. My coach utilizes a CR Brakemaster Model 62 air dryer. The air coming into the dryer is hot, the going air is cooler, but pressure coming in doesn't seem enough. I can hold my thumb over the fitting and stop the air. I've tried to get the air governor off the front of the compressor but the bolts are frozen tight. I've tried penetrating oil, but no luck. I wanted to try heat, but didn't want to damage the compressor. Can anyone help diagnose this problem?

Thanks,

Jeff Rahn