37 00 100 Draining/Filling Air Spring System (Twin-Axle Ride-Height Control)
WARNING: This page is about a different car, the 2006 BMW X5, 2005 BMW X5, and 2004 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Danger of injury! Drain the air spring system before carrying out any work on the air supply unit, air pipes and air springs! Danger of injury if this instruction is not complied with!
Risk of damage! The vehicle must not stand on its wheels when the air spring struts and air springs are depressurized! Otherwise the air spring struts and air springs will be damaged and later destroyed during driving!
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.
Risk of damage! The vehicle must not stand on its wheels when the air spring struts and air springs are depressurized! Otherwise the air spring struts and air springs will be damaged and later destroyed during driving!
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. Refer to 37 00 ... NOTES ON AIR SPRING SYSTEM .
Necessary preliminary tasks:
- Remove right underbody panelling.
- Deactivating air spring system
- Raise vehicle on lifting platform
- Remove ignition key
- Pull fuse for control unit
IMPORTANT:
Do not kink, twist or crush lines.
Draining air spring system:
- Carefully slacken banjo bolt(s) until the sound of escaping air can be heardNOTE: Wait roughly 2 minutes until the pressure in the relevant line of the air spring system is completely reduced (hissing sound stops).
- Only fully release banjo bolt(s) after pressure has completely reduced
Identifying Lines
| 1 | Black | Line to air supply unit |
| 2 | Yellow | Line to right air spring strut |
| 3 | Black | Line to left air spring strut |
| 4 | Black | Line to air accumulator |
| 5 | Black | Line to left air spring |
| 6 | Yellow | Line to right air spring |
Installation:
- Check banjo bolt(s) for dirt, clean if necessary
- Carefully insert banjo bolt(s) by hand in order to avoid damaging valve unit. Tightening torque 37 12 3AZ. Refer to INTEGRATED SUSPENSION SYSTEMS - TIGHTENING TORQUES X5 (4.4i) N62 .
Activating and filling air spring system:
- Insert fuse in corresponding slot in fuse box
- Connect BMW diagnosis system
- Switch ignition on
- Fill front left or right air spring strut using the BMW diagnosis system (control unit functions - component activation: activate menu item "Fill air spring strut" once)
- Fill rear left or right air spring strut using the BMW diagnosis system (control unit functions/component selection/"Fill rear left/right air spring strut" once)
- Check pressure at air spring struts and air springsNOTE: If an air spring strut or an air spring feels soft, carry out troubleshooting on the air supply unit, refer to 37 00 ... CHECKING AIR SPRING STRUTS/AIR SPRINGS FOR DAMAGE
- Set vehicle down on its wheels