As I said earlier people should either take an air brake course or at least read up on how the air system works.
The thing that I find scary is people asking questions about air leaks and other anomaly's and they are still driving the thing down the road. They have no idea of the repercussions of their lack of knowledge.
Some say the air brake manuals have too much info for the RVer. I agree they do.I have personally seen some folks out there on the road that are just plain dangerous and it is due to not knowing what they are driving. I try not to be critical but rather helpful when offering advice.