Quote Originally Posted by Joe Cannarozzi View Post
Hector this is a great question. Steve beat me to a responce but looks like we agree to a great degree.

DOT allows up to but not more than a 20psi drop in 10 minutes. That is with the brakes released. IMO that is ridiculous and bordering on unsafe and I am pretty confident no one here is anywhere near that bad.

So what you are asking is slightly different and want to know an acceptable amount of pressure drop with the parking brakes on.

IMO we are going for no loss at all.For perspective, I think if you can keep the aux air compressor to cycling once a day (if not using any pnewmatic accessories that would skew the loss levels) you are probably about average compared to the rest of the group.

Our bus was pitiful when we got it and would completely bleed off overnight.
I got it to the point that it would take a week until the suspension dumped. I know of other issues but do not have the doe to correct them. When I do I expect to see at minimum 100lbs indefinitely, at least that is what I strive for.

This is one of those issues for me. I have driven truck my whole life and was completely comfortable with reasonable or slight loss of pressure overnight. However since joining POG and being influenced by the likes of Jon that is no longer the case. There is no reason why given a reasonable amount of time we can not get these campers air tight or darn close to it.

So how about it Hector what kind of loss are we talking about here, Hmmmmmmmmmmm?
I am definitely leaking, but I am aggressively tightening thing up.

I believe I have a leak on one of the many braking components located under the coach. Here's my reasoning. After rebuilding the Bendix AD-9 Air Dryer, I started the coach to build pressure. After the 125 psi control spitting of the air dryer, I let the coach sit all night and the next morning, still 125 psi on the main air, Hurray!!. Not so fast, today while replacing and testing other components for leaks, I pumped the brake pedal a few times to consume air and build pressure back to the max. Now I notice, I am leaking again. I will test some of the braking components tomorrow.

I predict when I go out to the coach in the am, I will have lost 50 psi in 12 hours. When I pump the brake pedal, I can hear air discharging when the pedal is released. I am sure one or more of the exhaust ports are leaking.

What do you recommend on the troubleshooting the braking components? Any magical ideas or things to avoid.

On the suspension side, I have corrected several very minor leaks and it is looking good (cracked fitting on the new air bag Prevost installed). I am using a home made pneumatic tester for checking leaking suspension components. It works great!

I also replaced the check valve in the main air tank and the check valve in the aux air tank. I am working my way through the braking system.

Hector