jayres

The car has dropped very low in the front, but not so much in the back. The suspension does not pump up although one can hear the compressor running when you start the engine. No error messages. When I push the airbag lift button I get the picture of the car on the dashboard with an arrow indicating it is lifitng up, but it never lifts up.
I will appreciate any and all help with this. Car has 140K miles and all airbags were replaced by MB 1.5 years ago.
Thank you

Max Blast

Time to replace them again. Check with MB what warranty you might have had on that repair. 1.5 yrs seems like a very low lifespan for a normally loaded OEM bag.

jayres

Thanks.
Actually I am looking for diagnostic procedures to prove what is the problem.

Max Blast

Leak detector spray if you want to confirm where your bags are leaking, could also be the line connector in which case you’re lucky. Usually it will be one bag that leaks, and then the airmatic system compensates for level by letting air out of the other side.

the Mercedes limit is 10cm of sag per day on a normal 20deg c day.

DennisG01

There's literally (well, not "literally", of course) tons of information on this forum about this issue. Just search for it and you'll find plenty - nothing has changed so anything from 10 years ago is still valid. You've been here for over a decade... you must have seen some of these threads?

One thing I'd quick mention though is that you said you can hear the compressor run with the engine running. If it's quite noticeable, then it could be past it's due date. A good compressor is almost unnoticeable. Of course, this won't cause the suspension to drop, though.