34 52 516 Removing and installing/replacing DSC control unit

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Read and comply with notes on PROTECTION AGAINST DAMAGE FROM ELECTROSTATIC DISCHARGE (ESD protection).

Necessary preliminary work:

Remove HYDRAULIC UNIT .

IMPORTANT: Maintain conditions of absolute cleanliness.

Unclip brake lines (1) from holder (2).

Fig 1: Identifying Brake Lines And Holder

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Unfasten brake lines (1).

Installation note:

Tightening torque 34 32 1AZ .

Fig 2: Identifying Brake Lines

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IMPORTANT: Risk of damage to the contacts when removing and installing the hydraulic unit.

Release screws (1) and carefully detach DSC control unit (2) towards top.

Fig 3: Identifying DSC Control Unit And Screws

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IMPORTANT: Cleaning with compressed air, chemical solvents and sharp-edged objects is not permitted.
Do not touch pressure sensor contacts (2) with your fingers or clean the contacts.

If necessary, clean sealing surface (1) with a plastic scraper or a fluff-free cloth.

Fig 4: Identifying Pressure Sensor Contacts And Sealing Surface

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IMPORTANT: Do not touch valve coils (1) and pressure sensor contact springs (2) with your fingers, do not clean or readjust these components either.
Check gasket (3) for damage. If damaged, replace DSC control unit (4).

Fig 5: Identifying Valve Coils, Sensor Contact Springs, Gasket And DSC Control Unit

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Installation note:

Make sure screws are inserted evenly and DSC control unit rests on hydraulic unit.

Replace screws.

Observe tightening sequence (1-4).

Tightening torque 34 51 1AZ .

Fig 6: DSC Control Unit Bolts Tightening/Loosening Sequence

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Replacement:

Carry out programming/encoding
Brake line mix-up test:
Function check of hydraulic unit