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sorry for your problem. i may have had a similar problem with our 2000 country coach. on our way south to florida on interstate 95 a couple of years ago i noticed a loss in air pressure when i used my brakes in traffic. the pressure built up quickly at first when i let off the brakes, but as we got further the drop in pressure got worse. i pulled over to inspect and could hear an air leak in the engine compartment but could not locate the leak. i limped the bus to florida and set up an appointment with a shop. when the tech came out i showed him what i knew and he listened a bit and went and got an air leak headset and found that the main airline coming from the compressor to the main air tank was leaking. they called prevost and were told that the line was about $1,000.00 but was on backorder and was not expected for 10 months! we were not going to sit in the parking lot for 10 months (we live full time in the bus). after some help from the shop, we found a hose shop in daytona (1 hour away) that said if we brought a piece of hose and the 2 ends they could make me a new hose. we took the ends and hose piece in our pick-up to the shop and while we waited (45 minutes) they found the correct new ends and suitable hose to make the 10’ +/- high pressure, high temperature stainless covered replacement. price for the hose was around $400.00. after we got back to the shop they installed the new hose and we were fixed. if i remember correctly, their bill was for only 2 hours and we we on our way. no more leaks. good luck!