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Old 10-19-2015, 06:38 AM   #1
Mini-Skoolie
 
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My Bus is Sinking on One Side

Is this normal? My 1977 AMG has a kneeling feature that lowers it until its basically touch the ground so people can get on more easily and the whole this is controlled by air. The guy I got her from says she lets out air when she's off and changes stance. Recommended jacks at each wheel all set to the same height to keep her level (which I will be ordering today).

I didn't realized he meant at night she sinks down only on the right side and that, that side is nearly touching the ground (about an inch, maybe two from doing so actually). The other side is up almost half a foot, even on the even ground I just moved her to yesterday. I still woke up to the Leaning Tower of Pisa this morning. I'm a little worried the air system is being strained by this, not to mention the frame. Is it normal? Is it because the air is shrinking in the cold? Why only one side? I might just be being neurotic, but it doesn't seem normal to me.

This is what she looks like this morning:


Update: Just went inside the bus and I can hear air hissing. Not sure if she's just not done sinking or what, but it was not hissing yesterday.
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Old 10-19-2015, 08:43 AM   #2
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Air ride...
It likely has a leak on that side.
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Old 10-19-2015, 09:21 AM   #3
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I'll go with EastCoast's analysis...a leak somewhere in the air system on that side.
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Old 10-19-2015, 09:22 AM   #4
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Did buses that old have the kneeling function?
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Old 10-19-2015, 10:21 AM   #5
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Oh goodie haha. Well maybe I can kneel her then turn her off until I can get her looked at...

Any ideas on where I might find a mechanic who works with air ride? I'm not even sure our school buses do, so I'm not really sure where to start looking.
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Old 10-19-2015, 11:43 AM   #6
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Air systems aren't terribly complicated if you're willing to put in the time to fix em yourself you'd save a ton.
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Old 10-19-2015, 11:49 AM   #7
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Totally willing to put the time in, just don't have a clue what I'm doing, heheh.
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Old 10-19-2015, 12:17 PM   #8
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Tracking down an air leak may be time consuming but not terribly difficult to locate or repair. But, whatever else you do, don't go climbing around under the bus without secure blocks or something like jackstands in place.

Like a leaky tire, some soapy water should help find the offending spot. Most likely at or near a joint, but can also occur anywhere the lines are rubbing against something.

Good luck with it.
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Old 10-19-2015, 12:22 PM   #9
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Quote:
Originally Posted by Brie View Post

I see you went dirt track racing with her....... Hey! They're making another left turn! (notice the outside bleacher seats AND the infield garage)
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Old 10-19-2015, 03:04 PM   #10
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Youre definitely not doing any damage to it letting it sit slanted. The air suspension is built to undulate and tilt. You just have a leak in it. You probably always will since you have a 40 year old air system. Something will always be leaking until you replace everything! Seriously...ive spent close to 2 grand fixing the air system on an MCI MC9 and it will still air down after a week or so.

If it's a big leak, definitely find it and fix. Otherwise, either prepare to really get into the air system or find another way to level the bus when parked. Just trying to give you a realistic expectation here and save you spending tons of money on something that might never be totally fixed. That suspension is meant to always be fed by a compressor.
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