37 22 540 Replacing air supply system

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IMPORTANT:

When replacing the air supply system it is imperative that the relay for the air supply system is replaced at the same time.

WARNING:

Risk 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!

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.

NOTE: Read and comply with NOTES ON AIR SPRING SYSTEM .

Necessary preliminary tasks:

Deactivate air spring 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 lines.

Unscrew nuts (1).

Release screws (2).

Lever out expander rivets (3) and remove panel (4).

Fig 1: Identifying Airsupply Unit Panel With Screws, Nuts And Expander Rivets

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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 spring strut, left: Blue

Line (4), air spring strut, right: Red
Only fully release banjo bolt(s) after pressure has completely reduced

Fig 2: Identifying Plug Connections And Lines
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Installation:

Replacement: Remove and dispose of screw connections on new air supply unit!
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 the air supply unit.
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