33 31 503 Lowering/Raising Rear Axle Support (M3, M Coupe Universal Lifter)

33 31 503 Lowering/Raising Rear Axle Support (M3, M Coupe Universal Lifter)

Special tools required:







WARNING:
Danger of injury.
Failure to comply with the following instructions may result in the vehicle slipping off the lifting platform and critically injuring other persons.
Load the luggage compartment with a minimum of 100 kg before lowering/removing the rear axle support. This prevents the vehicle from tilting or sliding off the vehicle hoist.
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 vehicle hoist.







IMPORTANT: Before lowering/removing rear axle support:

Observe safety instructions for raising the vehicle

In order to avoid damage to vehicle hoist, perform weight compensation on vehicle.







Necessary preliminary tasks:
- Remove both rear coil springs.
- Remove rear silencer.
- Remove trailing links. (M Coupe)







Press brake 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.







Collect and dispose of brake fluid using suitable collecting vessel.
Release banjo bolts (1), counter supporting brake hoses (2) at square head in the process.
Tightening torque 34 32 1AZ.
Disconnect brake hoses (2) and seal off with seal plugs.

Installation note:
Make sure brake hoses are laid without tension and with sufficient distance to adjoining components.







Unclip cables for pulse sensor, ride height sensor and brake pad wear sensor on rear axle support at side.







M3 illustration:
Slacken nut (1).
Undo screws (2) and remove heat shield (3) on exhaust system.







Engage special tool 31 5 250 with a 2nd person helping on workshop jack 00 2 030.
Insert special tools 31 5 255 in telescopic supports of a profile rail pair.
Insert special tools 31 5 256 in telescopic supports of other profile rail pair.

NOTE: In a profile rail pair, two profile rails are connected to one another by gearing.







The jacking points on the left side are shown.

Align special tools 31 5 250, 31 5 255 and 31 5 256 to rear axle support.
Support rear axle support by operating workshop jack 00 2 030.

IMPORTANT:
The centre of gravity of the rear axle must be positioned centrally over the workshop jack.
Use tensioning strap 33 5 206 to lash rear axle support to special tool 31 5 250.







Remove compression struts (1).
Release screws (2) and remove stop plate.
Tightening torque 33 33 1AZ.
Lower rear axle support.

Installation note:
Check threads for damage; if necessary, repair with Helicoil thread inserts.
First fit compression struts (1), then tighten screws (2).







After installation:
- Bleed brake system.