Quote Originally Posted by treedoc View Post
Tom If a coach is leak free from the factory ( I presume ) than why can't it be leak free now? Jon I find it rather odd that the relief valve will leak one way but not the other! Air is air. It would be interesting to know the answer to that puzzle. Rick
I didn't say it wouldn't leak if I pressurized the system using the engine driven compressor.

When I start the engine I am usually going to drive away and with the engine running there is not way to hear a leak. However if I shut down for lunch at a rest stop, I don't notice it, but then again is is noisier at a rest stop than it is in my garage. I think exercising things makes them work better so that might be why it is not noticed when the engine is compressing the air.