34 51 527 Removing And Installing/Replacing Hydraulic Unit For DSC (S85)

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Necessary preliminary tasks:

Read and comply with General Information .
Remove FRONT LEFT WHEEL ARCH COVER .
Remove front left support.

After completing tasks, bleed brake system .

Installation:

After reinstalling the hydraulic unit, carry out the following tasks with the DIS (Diagnosis and Information System):

Mix-up check of brake lines
Function check, hydraulic unit

Apply pedal prop and depress brake pedal slightly. This prevents brake fluid from emerging from the expansion tank and air from entering the brake system after the brake lines have been detached.

Fig 1: Applying Pedal Prop & Depressing Brake Pedal

Courtesy of BMW OF NORTH AMERICA, INC.

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

Unfasten plug connection (1).

Unfasten brake lines (2).

Installation:

Tighten to specified torque. See SLIP CONTROL SYSTEM .

IMPORTANT: Do not bend brake lines.

Release bolts (3) and remove hydraulic unit.

Fig 2: Identifying Plug Connection, Brake Lines And Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

When replacing hydraulic unit:

Release bolts (1) and modify bracket (2).
Modify control unit

Fig 3: Identifying Modify Bracket And Bolts

Courtesy of BMW OF NORTH AMERICA, INC.