Removing and Installing Complete Rear Axle Carrier
33 31 000 Removing and installing complete rear axle supportSpecial tools required:
Warning!
Risk of injury!
Failure to comply with the following instructions may result in the vehicle slipping off the lifting platform and critically injuring other persons.
Read and observe the information on permissible load distribution in the lifting platform instruction manual.
Load the luggage compartment with a minimum of 100 kg before lowering/removing the rear axle support.
When supporting components, make sure that
^ the vehicle can no longer be raised or lowered
^ the vehicle does not lift off the locating plates on the lifting platform
Necessary preliminary tasks:
^ Remove rear wheels
^ Tension both coil springs (and leave on vehicle)
^ Remove propeller shaft
^ Expose cable for emergency release up to rear axle support
^ Disconnect plug connection on actuator unit (parking brake)
^ Unclip lines for pulse generator, brake pad wear sensor or shock absorber from holders above rear axle carrier
^ Disconnect plug connection at both ride-height sensors
^ Remove both rear shock absorbers on wheel carrier (release retainers for brake hose)
Version with ride-height control:
Deactivate and drain air spring/suspension system
Important!
Do not use any tools to remove the lower section of the air spring (1).
Tilt lower section of air spring (1) by hand towards front/side.
Installation:
Press lower section of air spring (1) by hand into wheel carrier until it can be seen and heard to snap into place.
Note:
The picture shows the plug connections on the right side on a vehicle with Vertical Dynamics Management (VDM).
Partially detach rear wheel arch cover.
Only on right side: Detach plug connection (1) for brake pad wear sensor and expose line up to control arm.
Detach plug connection (2) for pulse generator and expose lines up to control arm.
Version with Vertical Dynamics Management: Detach both plug connections (3) for shock absorber and expose lines up to control arm.
Press clutch pedal down to floor and secure with pedal support.
Note:
The pedal support may only be released when the brake lines are reconnected.
This prevents brake fluid from emerging from the expansion tank and air from entering the system when the brake lines are opened.
Position an oil sump underneath to catch brake fluid.
Release banjo bolts (1), gripping brake hoses (2) at square head in the process.
Disconnect brake hoses (2) and seal off with plugs.
Installation:
Make sure brake hose is laid without tension and with sufficient spacing to adjoining components.
Tightening torque 34 32 1AZ.
Engage 31 5 250 with a 2nd person helping completely on workshop jack 00 2 030.
Insert special tools 31 5 253 in telescopic supports of a profile rail pair.
Note:
In a profile rail pair two profile rails are connected to each by toothing.
Insert special tools 31 5 256 in telescopic supports of other profile rail pair.
Note:
The jacking points on the left side are shown.
Align special tool 31 5 256 to opening in rear axle support.
Align special tool 31 5 253 with crossmember arms on rear suspension subframe.
Version with Dynamic Drive:
Remove right underbody panelling (rear section).
Important!
Pay attention to control lines (2) when lowering and raising. Hydraulic lines must not be kinked/tensioned/bent!
Release banjo bolts (1).
Tightening torque 37 14 15AZ.
Remove front and rear compression struts and carefully lower rear axle carrier.
After installation:
^ Activate and fill air suspension system
^ Bleed braking system
^ If necessary, carry out initial Dynamic Drive operation
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