Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 21, 2025 ...

air leaks on a 2000 U320

November 04, 2014, 08:19:22 am

Good day everyone, looking for some direction and maybe this will help someone else with the same trouble.I have a 2000 U320 . When I have it parked with the maxi on or off with the motor off, I do not lose any air. When I am driving down the road and the road is not bumpy and the coach is stable and not swaying say in a corner, the air stays up. When I am going down the highway and the road is rough the coach loses air rapidly. I spoke to a gentleman at foretravel and told him my problem. He seemed to think that the air leveling valves could be leaking while I was going down the road. I have looked for leaks from front to back, and the leveling valves(I believe there are two) one in front and one in the rear cannot be checked while I am going down the road. Any help would be appreciated. I have not changed either valve yet. Thanks Bob

Quote Selected

Re: air leaks on a 2000 U320

Reply #1 – November 04, 2014, 09:29:29 am

Bob,
If you are talking about your ride height valves you should have 3. One in the front and two on the rear. They have air supplied to them when you are in travel mode.  If the road is very bumpy the valves are trying to keep adding and letting air out as they try to maintain proper ride height. Depending on how bumpy/wavy/rub board the road is will dictate how much air you will use.

I don't understand what "maxi" is though. If you are talking about the level system. it operates off a separate set of solenoid valves than your ride height valves do when you are parked and set to level. During this time the air to the ride height valves are shut off by the solenoid that feeds only the ride height valves.

Pamela & Mike

Quote Selected

Re: air leaks on a 2000 U320

Reply #2 – November 04, 2014, 11:48:13 am

Your description sounds like normal operation and operates like our coach. Two ride height valves in rear are responsible for correcting side to side coach movements. Every lean down on one side sets one ride height valve to dump air and the other one to add air. When side that dumped air will soon need to fill back. That is the way it works.

In normal operation air tanks should show air going from about 120psi down to about 90psi and then start to fill back up again. Anything far from this observation could mean problems.

Quote Selected

Re: air leaks on a 2000 U320

Reply #3 – November 04, 2014, 02:35:14 pm

Get under the coach and jiggle the lever to assimilate hitting bumps or sways in the road.. pushing up on the rod the valve is going to let air out of the bag.. that's not a leak it is just the system working..

Quote Selected

Re: air leaks on a 2000 U320

Reply #4 – November 04, 2014, 05:23:27 pm

Barry.. Some us the term maxi brake.

Quote Selected

Re: air leaks on a 2000 U320

Reply #5 – November 04, 2014, 09:39:51 pm

What do you mean loses air rapidly?

How long does it take to go down from 120 to say 95 psi and it turns the compressor back on?

At one time mine was cycling 70 seconds and was leaking ride height control valve, two.  I know the road matters, but before I would drive the road and cycle about every 250 seconds, so I could see the difference

Mike

Quote Selected

Re: air leaks on a 2000 U320

Reply #6 – November 06, 2014, 08:03:31 am

Thanks for all the replies to the air leak. I believe I will change out the two valves (just for good measure).Not sure what they cost ,but I am sure foretravel or my local truck guy could get them. I call the maxi the yellow button you pull to set the brakes.Thanks as always for the great advice on this forum,I will let you know how I make out.Bob

Quote Selected