Draining/Filling Air Spring System

37 00 100 - Draining/filling air spring system





Warning!
Danger of injury!
Drain the air spring system before carrying out any work on the air supply unit, air pipes and air spring struts! Danger 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 spring system.

Note:
Read and comply with notes on air spring system Notes on Air Spring System.





Deactivating air spring system:
- Raise vehicle on lifting platform.
- Remove ignition key.
- Pull fuse for control unit





Draining air spring system:
- Remove luggage compartment floor trim 51 47 101 Removing and Installing/Replacing Luggage Compartment Floor Trim Panel
- Remove wheel bolt wrench (1)
- Unscrew nut (2).
- Unclip cover (3) of backing surface for luggage compartment mat on left





- Unscrew nut (1).
- Turn bracket (2) a little to one side
- Disconnect plug connection (3).





Important!
Do not kink, twist or crush lines.
To avoid incorrect activation of the air spring struts, do mix up the pipes at the air supply unit connection.





- Carefully slacken banjo bolt(s) until the sound of escaping air can be heard
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).
Line, air spring strut, left: "Red"
Line, air spring strut, right: "Blue"
- Only fully release banjo bolt(s) 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 plastic thread and with it the air supply unit.
Tightening torque 37 12 3AZ Control and Suspension Elements, Rear.





Activating and filling air spring system:
- Insert fuse in corresponding slot in fuse box
- Connect BMW diagnosis system
- Switch ignition on
- Fill rear left or right air spring strut using the BMW diagnosis system (control unit functions -> component activation: activate menu items "Fill rear left/right air spring" once)
- Lower vehicle
- Reinstall removed parts