When I bought the coach three months ago I had problems with air leaks in the tires. One had a large metal piece in it, the others were leaking at the valve stem extenders. I still have a small leak on one of the inside rear tires and have to add air every few days. I have had a huge problem getting the rear tires up to 100 lbs and the front tires up to 110 lbs. I would start the engine and let the air pressure build up to the point it dumped the excess air, which is between 120 and 130 lbs. Then I would go out and air one tire but couldn't get enough in the others because the pressure in the system was now lower than what I wanted in the tire, but not low enough for the compressor to start again and raise the pressure up to max.
I saw a thread on one of the forums that linked to a YouTube video showing how a guy had built an adapter putting a pressure gauge in line with his air chuck so he could see how much air as being provided by the air system on the coach. This sounded like a great idea so I went out and bought the materials to make one. When I tried it I could see the pressure but the problem I ran into was that after using the air down below 100 lbs the compressor would not come on and build up the pressure again.
Finally the light bulb in my head lit up real bright!
Dummy! You've got to reduce the air pressure in the system down to the point where the compressor comes on and builds the air back up to max!
I took the air chuck out of the quick-disconnect, then pushed it part-way back in to let the air bleed off really fast. When the gauge showed the pressure down about 80 to 85, BINGO! the compressor comes on and we're in business again.
Yeah, I know I'm probably the only one on here who took that long to figure that out. If that's the case, WHY DIDN'T YOU TELL ME SOONER, before I wore out my knees trying to get air in those darn tires!!