34 51 527 Removing and installing/replacing hydraulic unit for DSC (from 08/2010)

WARNING: This page is about a different variant/trim than selected.

Necessary preliminary tasks:

Remove air cleaner See AIR CLEANER .
Read and comply with General Information. See 34 00... General Information and 34 00... General information on braking in new brake discs / brake pads .

After completing tasks, bleed brake system. See 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.

Fig 1: Pressing Clutch Pedal Down

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Remove line holder (1) from bulkhead.

Disconnect plug connection (2).

IMPORTANT: Do not mix up brake lines and if necessary mark prior to removal.
Close off connection bores with plugs.
Brake lines must not be bent.

Unfasten brake lines (3).

Fig 2: Identifying Plug Connection, Brake Lines And Line Holder

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Installation:

Tightening torque. See 34 32 1AZ. .

Raise vehicle. Release screws (1) from below. Installation note: Tightening torque 34 51 2AZ. .

Fig 3: Identifying Screws

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Release screw (1).

The clutch hydraulic line can be easily pressed to one side by release the holder.

Release screw (2).

Installation:

Tightening torque. See 34 51 2AZ. .

First raise hydraulic unit (3) a little and then swing out.

Fig 4: Raise Hydraulic Unit (3) And Swing Out

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Installation:

Make sure rubber mounts (1) are correctly fitted in bores.

Fig 5: Identifying Rubber Mounts

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Adjustment of steering angle sensor

Mix-up check of brake lines

Function check, hydraulic unit

Replacement:

Carry out programming/coding