34 51 527 Removing and installing or replacing DSC hydraulic unit

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Read and comply with GENERAL INFORMATION .
Remove lower section of microfilter housing . See 64 31 092 REMOVING AND INSTALLING/REPLACING MICROFILTER HOUSING (LOWER SECTION) .
Extract brake fluid
NOTE: Extract brake fluid out of expansion tank. Use a suction bottle used exclusively for drawing off brake fluid.
Do not reuse drawn out brake fluid.

After completing work:

Bleeding braking system
IMPORTANT: Do not mix up brake lines.
If necessary, mark before removal.
Close off connection bores with plugs.

Press cover (2) slightly to one side and disconnect plug connection (1).

Unfasten brake lines (3).

Installation:

Tightening torque 34 32 1AZ, see 34 32 BRAKE LINES

Fig 1: Identifying Brake Lines And Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew nuts (1).

Installation:

Tightening torque 34 51 6AZ, see 34 51 SLIP CONTROL SYSTEM (DSC)

Fig 2: Identifying Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: If necessary, release brake lines from holder on bulkhead.
Brake lines must not be bent!

Tilt out hydraulic unit (1) in direction of side panel.

Fig 3: Tilting Out Hydraulic Unit

Courtesy of BMW OF NORTH AMERICA, INC.

When replacing hydraulic unit:

Release screws (1) and convert holder (2).

Installation:

Tightening torque 34 51 5AZ, see 34 51 SLIP CONTROL SYSTEM (DSC)

Modify DSC control unit .

Fig 4: Identifying Convert Holder And Mounting Screws

Courtesy of BMW OF NORTH AMERICA, INC.

When replacing control unit:

Carry out programming/coding
Adjustment of steering angle sensor . See 61 31 996 CARRYING OUT STEERING ANGLE SENSOR ADJUSTMENT .
Mix-up check of brake lines