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When we 1st bought bus 8 years ago it leaned to right side driving the compressor cycled every few minutes could see it in Aux gauge, 100 to 120 psi over and over, So replaced all new bags – norgren valves- level valves- governor – air dryer and a few more things, At this point driving all gauges did not move, Parked there was no movement, after a week the aux gauge would be down 10 lbs FINE! In the winter I noticed more leak down, I chased leaks that I could not find, I drove myself nuts, Last couple of years I said driving down the road Aux gauge does not go down unless I brake so compressor is not cycling FINE! Parked in winter it looses some air so I’ve learned to live with it I did a few years ago install some isolation valves in steer compartment Air horn- foot well slide-air seat and got rid of red handled knob in rear for belt air bags because it leaked so bad and a new valve was $250, If I need to deflate bags I shut off 1/4 inch ball valve I installed and push schrader valve,works just fine, There is a check by regulator I replaced so belts never get loose.