34 51 527 Removing and installing/replacing hydraulic unit for DSC (M54 / N62 /N52 /N46)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 BMW 535xi, 2010 BMW 535i, 2009 BMW 535xi, 2009 BMW 535i, and 2008 BMW 535xi. However, it is still accessible from the selected car via links, so may be relevant.
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 work: Bleed braking 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)
- Function check, hydraulic unit
Press clutch 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.
IMPORTANT:
Do not mix up brake pipes (mark if necessary). Close off connection bores with plugs.
Disconnect plug connection (1).
IMPORTANT:
Do not bend brake lines.
Unfasten brake lines (2). Installation: Tightening torque 34 32 1AZ. Release screw (3) and remove hydraulic unit.
When replacing hydraulic unit: Release screws (1) and convert holder (2).