Air Spring: Service and Repair

37 12 070 Removing and installing / replacing rear left or right air spring strut





Warning!
Danger of injury!
Drain the air suspension system before carrying out any work on the air supply system, air pipes and air spring struts! Risk of injury if this instruction is not complied with!
Risk of damage!
Extreme cleanliness must be ensured in the connection area of the pipes during removal and installation. Even the smallest of dirt particles can cause leakage in the air suspension system.





Note:
Read and comply with notes on air suspension system.

In a warranty case you must always provide a fault memory printout, even where there is no fault entry, with the defective part.





Necessary preliminary tasks:
^ Deactivating air spring system:
- Raise vehicle on lifting platform.
- Remove ignition key
- Pull out fuse for air spring system in luggage compartment at rear right
^ Remove rear wheel arch cover
^ Remove rear parcel shelf
^ Release carbon canister on right wheel arch

Warning!
Danger of injury!
Do not disassemble the air spring strut! Air spring strut is still under a certain residual pressure even after the pipe is disconnected.





Important!
Risk of damage!
Do not kink, twist or crush pipes.





Carefully slacken banjo bolt (1) on air spring strut (2) until the sound of escaping air can be heard.

Tightening torque 37 12 1AZ.

Note:
Wait roughly 2 minutes until the pressure on the left side and/or right side of the air spring system is completely reduced (hissing sound stops).

Only fully release banjo bolt (1) after pressure has completely reduced.





Installation note:
- Check banjo bolt(s) for dirt, clean if necessary.
- Carefully screw in banjo bolt(s) by hand to avoid damaging the thread and with it the air spring strut.





Unfasten plug connection (1) and disconnect.

Unclip line from holder.

Installation note:
Check holder for damage and replace if necessary.





Fold acoustic insulation (1) upwards.

Unscrew nuts (2).

Tightening torque 37 12 4AZ.

Installation note:
Replace self-locking nuts.





Release screw.

Tightening torque 37 12 5AZ.

Press air spring strut off wheel carrier and remove towards bottom.





After installation:
^ Activate and fill air spring system
- Insert fuse in corresponding slot in fuse box
- Set vehicle down on its wheels
- Start engine
- Air spring struts are automatically filled