Removing and Installing/Replacing DSC Hydraulic Unit

34 51 527 - Removing and installing/replacing DSC hydraulic unit





Note:
Read and comply with General Information Service and Repair.
Observe safety instructions on raising the vehicle 00 .. ... Lifting Vehicle With A Lifting Platform.
After completing work: Bleed braking system Bleeding Brake System With DSC





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.





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





Important!
Do not mix up brake pipes (mark if necessary).
Do not bend brake lines.

Unfasten brake lines.

Installation Note:
Tightening torque 34 32 1AZ 34 32 Brake Lines.
Line connections:

(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





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

Installation Note:
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:
- Pressure sensor Service and Repair

- Hydraulic unit bracket





When replacing control unit:
- Carry out programming/coding Programming and Relearning

- Adjustment of steering angle sensor

- Mix-up check of brake lines

- Function check, hydraulic unit