I just replaced both of my rear suspension air bags. My R class has the full Airmatic suspension, which I have already replaced myself the front ones last year at $1000 x 2. I found a company Air Suspension Kits, Air Shocks, Suspension Parts, Struts - Arnott Industries
, which sells remanufactured suspension parts. I bought the set of two rear air bags for $299, compared to $550 each ($1100 for both rears) from MB . I installed them yesterday, and so far they are performing like OEM. The air bags are manufactured by Continental, which makes tires, and have a division which is Contitech that makes air bellows and other air suspension related parts. Arnott offers lifetime warranty, as I was hesitant because I thought their would not perform as well or that they would pop when loaded, but so far I am pleased. The replacement is so simple, as it also comes with instructions. The steps for removal are the following:
1.Raise up the vehicle from the body or rear cradle to allow rear tires to drop down.
2.Remove Compressor Fuse located in Engine Compartment (The second large orange 40 amp fuse is the compressor's). Remember to remove key from ingition.
3.Once vehicle raised from rear, removed the rear tires
4. Remove the airline at the top of the air bag on the opposite side from the wheel with an open 10mm wrench and remove the adapter from the line, as the new one already has such piece.
4. Pry the air bag down from the top with a flat screwdriver to release it from the locking pins at the top.
5.Remove the air bag by squeezing it through.
6.Remove and install the white securing pins with a flat screwdriver
7. Install the new air bag with the air inlet towards the inside. Make sure the bottom is seated properly to match the notch.
Reconnect the airline and ensure that it is all the way in and that the colored marks on the airline are against the fitting in the airbag (just push it hard until it cannot go more).
8. Reinstall tires, lower vehicle (the vehicle will drop the wheels into the wheelwells), reinstall the fuse, and turn on the car so that compressor fills the bags (you may hear a couple of pops, but they are normal).
9.Check tha the vehicle does not drop all the way into the wheelwells, as it is a sign that you still have an airleak (leaking air at the connection fitting is the most likely problem), otherwise, you are done!