37 22 540 Replacing the 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 also replaced. See REPLACING RELAY FOR AIR SUPPLY SYSTEM
.
IMPORTANT:
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!
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!
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 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 pipes.
Release nuts and screws.
Remove trim (1).
- Unlock plug connections (1) and (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: Red
Line (4), air spring strut, right: Blue
- Only fully release banjo bolt(s) after complete pressure reduction
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 .
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