34 52 516 Removing And Installing / Replacing DSC Control 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.

IMPORTANT: Read and comply with notes on protection against electrostatic damage (ESD protection) . See 61 35 ... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) .

When replacing control unit:

Carry out programming/coding . See VEHICLE PROGRAMMING AND CODING .
Function check, hydraulic unit

Detach coolant tank (1) and place to one side.

NOTE: Not for vehicles with M67.

Fig 1: Identifying Coolant Expansion Tank

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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.

Lock plug connection (1).

Fig 2: Unlocking Plug Connection

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Release screws (1) and carefully remove control unit (2) from hydraulic unit.

Fig 3: Identifying Screws, Control Unit And Hydraulic Unit

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Installation:

Replace screws.

Check sealing face (1) for damage (visual inspection).

Clean sealing surface (1). When doing so, do not use tools with sharp edges or aggressive cleaning agents.

Check contact lugs (2) for corrosion or damage.

NOTE: Replace hydraulic unit if sealing surface (1) or contact lugs (2) is/are damaged.

Fig 4: Identifying Sealing Surface And Contact Lugs

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Carefully push control unit (1) onto hydraulic unit (2).

IMPORTANT: Solenoid coils must not be jammed!

Fig 5: Pushing Control Unit Onto Hydraulic Unit

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Housing edge of control unit (1) must slide over shoulder on hydraulic unit (2).

Fig 6: Identifying Edge Of Control Unit And Hydraulic Unit

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Installation:

Mount control unit as follows on hydraulic unit:

Press control unit onto hydraulic unit.
Insert screws (1) and (2) (do not tighten down) until control unit rests evenly.
Provisionally fit screws (3...6).
Tighten down screws (1...6) in specified sequence.

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

Fig 7: Identifying Screws

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