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Discussion Starter #1
Hi all, thanks in advance.

Car levels fine after startup, but once car is shut off, air seems to leak out of driver side rear such that the car is lopsided when in park. No lights, no warnings, no problems driving ( yet! ).

I'm assuming that charging the battery to ensure that it retains the air level is not going to be enough here. Rear strut issue? Valve leak?

I was hoping to sell the car, but I don't want it to break down on the next guy.

2001 Merc S430
 

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W221 & Audio Moderator
2013 S550
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10,911 Posts
That would be from a leak in the strut on the low side, and eventually it will also burn out the Airmatic pump. With luck, it will be a top seal problem on the front strut; these can be replaced for about $250 each, through the dealer.
 

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Discussion Starter #3
Thank you Skylaw. Any idea on what might be the time frame that I'd have to get this looked at by an indy? I wouldn't want it to cause more problems because I let it go too long. It's been this way for a couple of weeks already.
 

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W221 & Audio Moderator
2013 S550
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Thank you Skylaw. Any idea on what might be the time frame that I'd have to get this looked at by an indy? I wouldn't want it to cause more problems because I let it go too long. It's been this way for a couple of weeks already.
I would check soon. Time frame depends on how much the pump has to run to keep the suspension inflated, and with a leak it will run often while you are driving, and also will run a lot when you start.
 

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W221 & Audio Moderator
2013 S550
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Also, sorry - I missed that you said it was low in the rear (it was a very long day yesterday). There is no seal kit for rear struts. However, the leak could be the strut, a line to the strut, or possibly even a valve block problem - but it could be more expensive than the $250 seal kit.
 

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Discussion Starter #6
Thank you Skylaw. Do you know if there is any analysis that I might be able to do myself to further diagnose without having to put the car on a lift or anything like that?

Appreciate your responses.
 

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W221 & Audio Moderator
2013 S550
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Only squirting soapy water on the components; I would start with the low strut and go to the valve block next (It's attached to the pump in the right front fender area of the car). Some pics that might be helpful are at http://www.benzworld.org/forums/w220-s-class/1401924-s-class-air-matic-pump-replacement.html and http://www.nicedeals.co.uk/blog/diy-guides/mercedes-diy/mercedes-s-class-air-matic-pump-replacement/ (the latter provided for photos only - some techs say the steps are incomplete for replacement); and the rear shock replacement video at http://www.bilstein.com/airmaticshockinstall/index.html may be helpful in finding your way around.
 
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