Air Dryer Purge Valve
My purge valve on the air dryer purges at 120 (so far so good) then continues to spew out some air until pressure falls to 90 lbs and then stops putting out air while the compressor is running. This is without using any brakes, either sitting still or driving. I had the dryer rebuilt. Still does the same thing. Cycles like this about every 2 or 3 minutes. I'm fairly certain this is not normal, but can someone give me some insight?
1997 Gulf Stream Sun Voyager 34' air brakes, air ride suspension. Thanks!