Removing and Installing/Replacing Control Unit

34 52 515 - Removing and installing/replacing control unit





Necessary preliminary tasks:
- Remove hydraulic unit





When replacing control unit:

- Carry out programming/coding Programming and Relearning
- Adjustment of steering angle sensor
- Mix-up check of brake lines
- Function check, hydraulic unit





To remove the hydraulic unit, close off the brake line connections with the plugs (1) contained in the control unit repair kit.

This prevents brake fluid from escaping from the hydraulic unit, which in turn facilitates the subsequent bleed of the brake system.

Important!
Secure pump motor with retaining tab (2) and plug (3) from control unit repair kit on valve block.

Pump motor and valve block must not be separated!





Release bolts (1) and remove bracket.

Installation:
Tightening torque 34 51 2AZ 34 51 Slip Control System (ABS, ASC+T, DSC).





Release screws (1) and carefully remove control unit (2) from hydraulic unit.

Tightening torque 34 51 1AZ 34 51 Slip Control System (ABS, ASC+T, DSC)





Installation:
Make sure that plug-in contact (1) is correctly inserted in bore hole (2).

Make sure plug-in contact (1) is engaged correctly in the control unit before assembling the control unit and hydraulic unit.