I have the leans and am out of ideas

Good morning all... my 2006 marathon started to lean on the drivers side after an air line replacement at Prevost Nashville. It was the steel covered line from the pump to the 5 port valve at the bulkhead wall. I realize it should have nothing to do with the coach leaning. I removed all 3 wheels and found a few small leaks and repaired them. Soaped and ran my leak detector over everthing and found nothing so i replaced the wheels and the coach leaned again over night-about 1/2 inch per 2 hours. Removed tires again and decided to replace all 3 airbags, the ride height valve along with the one way valve, the 3 way and the 5way valves and two iffy air lines and all tank ball valves. Checked every thing and found no leaks. Put the tires back on and it leaked again. The main air tank retains all its air. Finally gave up and took it to Prevost Dallas who replaced a valve up front but found nothing in the rear. Returned home and bus leans at the same rate it always has. I'm out of ideas! anybody got any?

Bill R

On my bus with the Key off, air is trapped at the Norgen valve. If it's leaning you definitely have a leak somewhere, I hate to say it but you need to look again. Pull the 2 drive tires and tag on that side, and soap everything in that circuit, Norgren, Ride Height Valve, Air Lines, Fittings, Bags etc. We have seen cases where the bag is leaking on the inside around the mount, this one is hard to detect. Leaks are something we all have and deal with, some folks are more picky than others, Some just dump the air when it's going to sit for a while so it won't lean.

Always heard dumping the air and leaving it down on a independent front suspension is not good for the upper ball joints on the A arm’s
Chuck

Chuck, My Bus is Pre IFS so that wouldn't matter to me. Your comment does make me wonder though how many thousands of busses are out on the Road with IFS. Do you think all these busses have no air issues and stay at Ride height for their entire lives?

Mike:
If I get 6 months to a year with out chasing air leaks I consider my Self lucky
Chuck

Yes, Joe Camper said that you should never leave the bus for long periods of time with the front down. I believe his quote was "keep em aired up boys"

Gravity seems to always win when it comes to our air suspension. I bet there are many many busses aired down all around the country, I am in Quartzsite right now and there are at least 5 fairly modern busses I pass by every day that are aired all the way down. Anyone with IFS that has a Prevost Chassis manual? If it was important i bet Prevost will put the "Do not let your bus air down warning there?

We, too, are chasing air leaks. Prevost Mira Loma found 2 more Norgrens and a connection leaking. Coach staying at ride height now but sinking for over 6 days. Rear is sinking faster but not totally down. But again both of our air tanks are at zero over night. That hasn’t changed. Brake D O Tvtedt and bleed down pass test. Still a mystery with “flat” air tanks. House Aux system is separated from chassis. So that cant play intomit. Ifeas

I know you've replaced all the usual suspects, but just throwing this out there. When IGN is off the 5-Port should be in a neutral position that doesn't allow air in or out. But if that 5-Port has an internal leak you probably won't see it at the 5-Port, but instead up-stream at the exhaust port of the bottom Level Low Norgren under the drivers seat. Something very similar was happening to another owner - he put a balloon on that exhaust port and over-night it began to inflate. Just a thought.

http://forum.prevostownersgroup.com/...id=18897&stc=1