34 52 515 Removing and installing/replacing control unit

Necessary Preliminary Tasks: 

• Remove hydraulic unit. Refer to 34 51 525 REMOVING AND INSTALLING/REPLACING HYDRAULIC UNIT FOR ASC+T  and 34 51 527 REMOVING AND INSTALLING/REPLACING HYDRAULIC UNIT FOR DSC .

When replacing control unit: 

• Carry out programming/coding. Refer to DIAGNOSIS PROGRAMMING/CODING .
• 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. Refer to 34 00 048 BLEEDING BRAKE SYSTEM WITH ABS/ASC+T  and 34 00 050 BLEEDING BRAKE SYSTEM WITH DSC .

Fig 1: Identifying Brake Line Connections

Courtesy of BMW OF NORTH AMERICA, INC.

Release bolts (1) and remove bracket.

Installation: 

Tightening torque, (8 N.m.).

Fig 2: Removing Bracket

Courtesy of BMW OF NORTH AMERICA, INC.

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

Tightening torque, (5 N.m.).

Fig 3: Removing Control Unit From Hydraulic Unit

Courtesy of BMW OF NORTH AMERICA, INC.

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.

Fig 4: Inserting Plug-In Contact Into Bore Hole

Courtesy of BMW OF NORTH AMERICA, INC.