Hydraulic Control Assembly - Antilock Brakes: Service and Repair

34 51 527 Removing And Installing/Replacing DSC Hydraulic Unit







Necessary preliminary tasks:
- Read and comply with General Information.
- Remove front left rear wheel arch panel.
- Remove left underbody panelling.
- F12: Remove left V-strut.

After completing repair work:
- Bleed brake system







IMPORTANT:
Do not mix up brake lines.
If necessary, mark before removal.
Brake lines must not be bent.
Close off connecting bores with seal plugs.







Press brake pedal down to floor and secure with pedal support.

NOTE: The brake pedal may only be released when the brake lines are reconnected. This prevents brake fluid from emerging from the expansion tank when the brake lines are opened.







Cut open cable strap (1).
Replace cable straps.
Remove foam block (2).
Lever out penetration (3) and pull out towards front.







IMPORTANT: Do not bend brake lines.

Grip at square head (1) and release brake lines (2).
Tightening torque 34 32 1AZ.







Unfasten brake lines (1).

Installation note:
Tightening torque 34 32 1AZ.







Disconnect plug connection (1).
Unfasten screws (2).

Installation note:
Tightening torque 34 51 5AZ.

Remove hydraulic unit (3) towards bottom.







Replacement:
Unclip brake lines (1) from holder (2).







Unfasten brake lines (1).

Installation note:
Tightening torque 34 32 1AZ.

Unfasten screws (2). Take off holder (3).

Installation note:
Tightening torque 34 51 4AZ.







When replacing control unit:
- Carry out programming/encoding