34 51 527 Removing And Installing/Replacing DSC Hydraulic Unit

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Read and comply with General Information . See 34 00 ... GENERAL INFORMATION .

Observe safety instructions on raising the vehicle. See 00 ... ... LIFTING VEHICLE WITH A LIFTING PLATFORM .

After completing tasks, bleed brake system . See 34 00 050 BLEEDING BRAKE SYSTEM WITH DSC .

When replacing control unit:

Carry out programming/coding . See VEHICLE PROGRAMMING AND CODING .
Adjustment of steering angle sensor
Mix-up check of brake lines
Function check, hydraulic unit

Load and block brake pedal with pedal support.

Fig 1: Depressing Brake Pedal

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Release coolant expansion tank (1) and place to one side Not for vehicles with M67 engines.

Fig 2: Identifying Coolant Expansion Tank

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IMPORTANT: Do not mix up brake pipes (mark if necessary).

Unfasten brake lines.

Installation:

Tightening torque. See BRAKES - TIGHTENING TORQUES -- ALPINA .

Line connections:

Fig 3: Identifying Brake Lines

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(F) From brake master cylinder, circuit F, to hydraulic unit, circuit F (front-axle brake circuit)
(R) From brake master cylinder, circuit R, to hydraulic unit, circuit R (rear-axle brake circuit)
(FR) From hydraulic unit FR to wheel brake, front right
(FL) From hydraulic unit FL to wheel brake, front left
(RR) From hydraulic unit RR to wheel brake, rear right
(RL) From hydraulic unit RL to wheel brake, rear left

IMPORTANT: Do not bend brake lines.

Unlock plug connection (1) in direction (2) and detach vertically upwards.

Installation:

Position plug connection (1) vertically on control unit in order to avoid damaging pins.

Disconnect plug connection (4).

Release screw (5) and remove hydraulic unit.

The following components must be modified when the hydraulic unit is replaced:

Fig 4: Identifying Plug Connection And Screws

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Pressure sensor . See 34 51 560 REMOVING AND INSTALLING/REPLACING PRESSURE SENSOR FOR DSC .
Hydraulic unit bracket