[Liam]

I will start with the assumption the problem is not related to the air bags or Norgrens. More on that in a bit.

You have push in fittings for the air system on your vintage coach. The air bag fittings are large, 1/2 pipe to 5/8 tube if i am correct. Start looking for the leak there. If they are leak free which I doubt lok at the ones on the Norgren valves. Concentrate on the RH side from the 5 port through the drive and then tag axle air bags. Look at the 3 port valve on the frame between the tag and drive. It is probable the problem is within that area.

Don’t rule out a defective air bag or Norgren. The probability of one of those being the issue is remote, but possible.

[Liam]

Thanks Jon…..I wanted to go “armed” with something for them to begin with.

[Archived]

I’m with Jon on this; they prob reused (common practice) push pull fittings. and one or more didn’t seal back. It doesn’t take much of a slow leak to loose a small amount of air that would let that happen. In the overall view it really is a small leak. Good luck with your quest. If later on you decide to do it yourself we can help… Bob

[glen]

Thanks Bob, I’m not quite at the point where I want to try this myself…hope to get there soon but this is part of getting the coach zero’d out and it is in my budget to have it done. Much to learn!!

[Davy]

What happens when you raise the tag axles and let it set overnight?

[Archived]

Haven’t tried that yet? I got home from camping on Monday. Parked the coach in the barn, plugged in and did the usual set up……Came out at 7:00 a.m. and the passenger rear had dropped just about 6 inches….driver side and front stayed aired up. What would lifting the tag tell me? I could do that tonight, air it up and then lift the tag and check it in the morning…..we are headed 2.5 hours south to the Prevost service center in Flint at about 10 Wednesday morning. They want to put the coach over the pit inside and leave it overnight to see how much it drops. Then they will do the fix on Thursday if they can locate the leak.

[Chuck]

if it stays up it should tell you that the leak is in your aux air system. When mine drops after sitting the aux air goes below 30-40 PSI the system automatically dumps the tag axle air. It seems like when it does the passenger side is lower than the drivers side.

[Archived]

What you suggest Greg is a good idea for ruling out anything from the 3 port back to the tag. If you do that and it still leans focus on the two drive axle air bags and their fittings. If it does not concentrate on the three port Norgren, the tag air bag and its fittings.

[Bob]

Jim, after spending several thousand buckaroos at Prevost and at 2 different locations mine still will leak down but takes several days. This is after replacing valves, parts and pieces, air bags and who knows what else and several overnight stays were they (techs) had it days at a time working on this perticular problem. I applaud you in trying your fix. Somebody told me to find all leaks was to drive it in the lake and look for bubbles.

[Fred]

I wouldn’t care so much but it goes down considerably overnight which makes leveling difficult. I’ve had to dump the air and hope the site is level. My last coach lost air but with jacks it was no big deal.

[Jerry]

Yeah, The longest we have stayed put and leveled was 3 or 4 days and bus held that long since last repair. Wish that when I built my bus barn, I would have built a pit in it for just that kind of repair. From what I have spent with Prevost it would been a wash on concrete pouring. Or at least that is what I tell my wife! When I bought this bus 3 years ago the first problem was ride height vavle wouldn’t rise to drive level. After fixing that they called before I picked up and said it was leaning on passenger side overnight. Everything went on from there. Have replaced a lot of goodies but happy now with air. One thing I noticed that air guages didn’t hit 0 because it was leaning and on bottom. Hope you get it figured out. If anything these guys will help you out. A wealth of knowledge.

glen s.

[Archived]

not a fan! latest and greatest.. not really — have had more problems with them –especially on reuse than any others. I quit using them at all.. Went back old school. They are touchy to temp change.. 20 deg change and the are prone to leak. If you have a area leaking down and can’t find with soap bubbles just wiggle hose while soaping and some bubbles just might show up with that type fitting. FWIW Bob

[John]

Got It!!!! The valve on the passenger side above the drive tire above the air bag was the culprit……The coach has been aired up since Wednesday and it is holding level. Thanks for the suggestions and help. I took the opportunity to go in the pit and inspect the underside while at the shop. Next pole barn is going to have a “pit” also. Makes things easier than crawling on your back.

[Archived]

One thing anyone with the “leans” can do before starting to chase the leaks is go to the Prevost Car website and look at the webinar Robert Hitt prepared to describe the level low system.

While the specific location of some leaks is difficult to find learning the basic operation of the leveling system sharpens the focus and in some cases allows the leak detection process to be much easier than searching around the entire coach.

https://prevostevents.webex.com/mw0307l/mywebex/default.do?siteurl=prevostevents

Jon

[Bob]

Thanks Jon,

I listened to the webinar today and it cleared up a bunch of confusion I had with regard to the level low system. We are on day 3 now and the coach is still aired up and staying level…wonderful. Now if I can just figure out why the electric element on my aqua hot isn’t heating that well all would be good. I was hoping not to winterize the coach and simply keep it plugged in with the aqua hot going till we leave in December but I’m having second thoughts about that. The diesel burner is fine but on my old coach I could plug in to 30 amp and the electric would keep the coach at 50 degrees till we left.

Oh well, I can learn how to blow it all out now so I know how to do it in the future.