37 22 540 Replacing the air supply system

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT:

When replacing the air supply system, run Converting the EHC replacement compressor with the diagnosis system!

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! Danger of injury if this instruction is not complied with!

IMPORTANT:

Risk of damage!

Extreme cleanliness must be ensured at the connection face of the pipes during dismantling and installation. Even the smallest of dirt particles can cause leakage in the air suspension system.

Necessary preliminary tasks:

Deactivating air suspension system:
- Raise vehicle on lifting platform.
- Remove ignition key
- Pull out fuse for air spring system in luggage compartment at rear right

IMPORTANT: Do not kink, twist or crush pipes.

Unscrew nuts (1).

Unfasten screws (2).

Lift out expanding rivets (3) and remove trim panel (4).

Fig 1: Identifying Air Supply Panel With Nuts, Screws And Rivets

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug connections (1/2) and disconnect.

Carefully slacken banjo bolt (3) and (4) 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 (3), air suspension strut, left: Blue

Line (4), air suspension strut, right: Red

Only fully release banjo bolt(s) after complete pressure reduction

Fig 2: Identifying Plug Connections And Lines Banjo Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Replacement: Remove and dispose of screw connections on new air supply system!
Reuse screw connections on lines.
Check banjo bolts for dirt, clean if necessary.
Carefully screw in banjo bolts by hand to avoid damaging the plastic threads and with it air supply system.
Tightening torque 37 12 1AZ .

Unfasten plug connector (1) and disconnect.

Disconnect ventilation line (2).

Release nuts (3) and remove air supply unit.

Tightening torque 37 22 1AZ .

Fig 3: Identifying Air Supply Unit Plug Connector, Ventilation Line And Mounting Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Activating and filling air spring system:

Insert fuse in corresponding slot in fuse box
Set vehicle down on its wheels
Start engine
Air spring system is automatically filled