Replacing Hydraulic Unit For DSC

34 51 527 Removing and installing/replacing hydraulic unit for DSC (IM5411462)

Necessary preliminary tasks:
^ Before removing hydraulic unit, read out control unit fault memory and if necessary print out diagnostic trouble code.
^ Read and comply with General Information.

After completing tasks, bleed brake system.

Installation:
When replacing the control unit, carry out the following tasks with the DIS (Diagnosis and Information System):
- Vehicle coding (performed by the vehicle itself)
- Adjustment of steering angle sensor (performed by the vehicle itself)
- Adjustment of brake pressure sensor (performed by the vehicle itself)
- Adjustment of lateral acceleration sensors (performed by the vehicle itself)
- Mix-up check of brake lines
- Function check, hydraulic unit





Apply pedal prop and depress brake pedal slightly. This prevents brake fluid from emerging from the expansion tank and air from entering the brake system after the brake lines have been detached.

Important! Do not mix up brake pipes (mark if necessary).
Seal off connection bores with plugs.





Unfasten plug connection (1).
Unfasten brake lines (2).

Installation:
Tightening torque, 34 32 1AZ; Brake hose couplings 18 Nm.

Important! Do not bend brake lines.

Release screw (3) and remove hydraulic unit.
When replacing hydraulic unit:
Release screws (1) and convert holder (2).