Removing and installing/replacing right rear module hydraulic cylinder (M4 Convertible)

Necessary preliminary tasks:

IMPORTANT: Hydraulic fluid may emerge from the disconnected lines and the open connections on the hydraulic cylinder.

Protect components and work area with suitable materials (e.g. cloths).

Open the rear module (see illustration).

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Feed out control unit (1).

Open the shutoff valve on the hydraulic unit by three turns using a hexagon socket (SW4).

NOTE: Shutoff valve is located under a plastic funnel.

System is now de-pressurized and can be moved manually.

Fold the luggage compartment cover downwards.

Close tailgate.

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IMPORTANT: Convertible top compartment lid can tilt forwards when hydraulic cylinders are removed and must be supported with suitable apparatus.

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Open tailgate.

Release screw (1) and cable strap (2).

Feed out holder (3).

Installation note:

Replace screw (1) and insert with Loctite.

Tightening torque 54 37 31AZ .

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Unclip hall effect sensors (1).

Slide locking clip (2) upwards.

Pull off hydraulic cylinder (3) from ball sockets at side.

Feed out hydraulic cylinder (3).

Installation note:

Slide retaining clip (1) back into installation position.

Ensure correct fit of the retaining clip (1) on the hydraulic cylinder (2).

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IMPORTANT: Protect joints (lines and cylinder) against dripping fluid, e.g. with a cleaning cloth.

If necessary detach cable strap.

Slide open retaining rings (1) with screwdriver.

Detach hydraulic lines (2).

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Installation note: