Air Suspension system

[DominicM]

Im sure I know the answer but I am still going to ask the question.  I aired up the suspension this morning via my electric compressor.  I left for a couple hours, when I came back I noticed that the drivers side front corner was lower that the rest of the bus.  I did fill it up again and climbed under enough to see both bag are filling up. 

At this point I will need to climb under and start checking for leaks with a soap and water mixture.    Reading the service manual there is a check valve, and a leveler valve. Are these generic parts that I can pick up at Fleet Pride or are they something that I need to preorder from MCI?  Is there any thing that I need to watch out for or be aware of before I start looking for leaks, check valves, and lever valves? 

I do plan on ordering new airbags from MCI and replacing all of them just as a preventive measure, possibly installing one of the kits to use the bags to level when parked.

[chessie4905]

If bubble check doesn't give results, rig up a Schrader valve adapter to bypass levelling valve. This way you are directly airing up air bag. Check after sitting overnight. Worked for me a couple years ago to find a leaking bag. Good adapter to have around for finding elusive leaks. Don't go over 50 to 75 lbs.

[richard5933]

Just be absolutely certain that you block up the body of the bus before getting under it. If something gives way while you're under, there is not enough room to live.

[DominicM]

I have a dozen pipeline skid 4X6 blocks to use as blocks.

[bigred]

Since your front suspension only has one leveling valve?? It would have to almost be a problem around the wheel ,however ,on my Preavy there are four leveling valves in the rear ,so I would also check to make sure it is not a problem in the back .Have a friend who has worked on a lot of fleet buses and he says the only difference in the leveling valves that you buy from MCI or Prevost and the ones you buy from Grainger  is the price .He tells me that he has even rebuilt these things .Hey guy's ,if I am telling him wrong ,some body slap my wrist again,lol 

[Dave5Cs]

Here is the could be's. Front
Blown Air bag you have 4 in the front.
Airbag filter on one side could be plugged up.
Disconnected air line from an airbag but will generally hear it.

Being it is like a triangle with 3 leveling valves, 1 up front and two in the back. Front adjusts coach level front to back and the rear leveling valves adjust side to side sooooo,
Bad leveling valve rear one side.
Stuck arm on leveling valve or broken arm.

[DominicM]

Thank you for the insight, I will at the moment guess its one of the sides probably drivers sense the drivers side is empty in about an hour of standing still. I  can not locate any air leaks but all the bags are cracked so I will replace all of them. Sense I am already there I will replace the filters and levelers.  I did notice that the bung on the rear tank is covered in pack rust. I am afraid to touch it until I have a replacement tank.   Any ideas on where to get one at?

[chessie4905]

Check with Luke at US Coach.

[DominicM]

he was on my list of places/ people to check with.