1999 U295 over100,000 miles. It just started to dump air after leveling. I will level it like normal and anywhere from 5 minutes to two hours it dumps the air and it lowers to it to the bottom. The air bags are new.
Sounds like you have a good air leak either in a line or the 6 pack.
Is only 1 corner going down, front, rear, or the whole coach?
It lowers evenly. What and where is the "six pack"?
The standard operation of the leveling system when you start at ride height and press "level" at a site is to first exhaust to lower high corners then raise the corners that are too low and couldn't be compensated for by lowering. It stays "awake" for a few minutes, then goes to sleep.
Then, every half hour or so, the system "wakes up" to relevel you. First, it lowers the higher corners, and then if it can't achieve level that way, it raises the low ones.
Rinse. Repeat. Every half hour.
If your coach is initially leveling, then having to lower everything within the "wake" minutes, and again lowering again 30 minutes later, it sounds like there is a leak in one corner.
To test, start at ride height (travel). Put the system in leveling mode and watch the HWH pad. This will take a while, but you want to watch to see what lights are illuminated when it wakes up and relevels. Those amber lights are your low corners and the likely ones to have a leak.
Did this JUST happen after the air bags were replaced? If so, one should suspect an air bag fitting (since it's the last thing "messed with"). Lesser shops will reuse fittings. They really should be replaced with the airbags.
what is the "six pack " that was mentioned above. I will go under it tomorrow with my soap bottle and de-leak is as much as I can but I don't know what to look for. I noticed several pressure gauges set at 60spsi. Is this the correct pressure and what do they service.
The six packs are manifold blocks with solenoid valves that feed the air leveling system.
DO NOT GET UNDER YOUR COACH WITHOUT FRAME SAFETY BLOCKS!!!
There is a six pack for each axle. They are NOT in safe locations if you do not block the chassis first, especially if you don't know what you are looking for. The coach could suddenly lower and crush you.
FIRST - do not get under the coach without safety blocks. See the thread at the top of the tech section!
There are many recent threads talking about the six-packs. A little searching and reading will yield much valuable reading. There are kits available for rebuilding them. You should also become familiar with the drawings for the air system on your coach. Each coach/year has differences. It will help greatly with tracking down the problem.
Rich
As usual, Michelle beat me to it!
Rich