Installing the clutch master cylinder

WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.

Install the clutch master cylinder (2).
Replace bolts (1).
Parts: bolt
Insert the bolts (1) and turn clockwise by 90°.
The lugs (arrows) must lock in place in the groove.

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Insert clutch master cylinder (3) into clutch pedal (2).
Replace bolts (1).
Parts: bolt
Insert the bolts (1) and turn clockwise by 90°.
The lug (arrow) must lock in place in the groove.

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Protect the clutch switch (1) from incorrect assembly.
The clutch switch (1) must engage audibly.
Engage connector (3) in plug connection (4).

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Connect the supply hose (1) on the clutch master cylinder (2).

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Connect the hydraulic line (2) on the clutch master cylinder (3).
Clamp (1) must engage audibly.

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Insert the supply hose (2) on the expansion tank (1).

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Connecting the bleeder unit for the brake fluid

To guarantee a correct vent of the brake system, the following procedure must be observed!
Top up the brake fluid in the expansion tank to the lower edge of the thread (1) with new brake fluid.
Vent the hose of the bleeder unit before connecting.

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NOTE: TECHNICAL INFORMATION
Use only BMW-approved brake fluids; see OPERATING FLUIDS .

NOTE: RISK OF DAMAGE
Paint damage.
Mechanical or chemical action may lead to paint damage.

Cover up working area with specified covering material only.

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Connect the bleeder unit (1) to the brake fluid expansion tank and turn it on.
Follow the operating instructions of the respective equipment manufacturer.
Do not exceed the tire pressure of 2 bar.

Venting clutch hydraulic system

NOTE: TECHNICAL INFORMATION
Connect bleeder unit to brake fluid expansion tank.
Check relevant equipment manufacturer's operating instructions for each device.
Charging pressure should not exceed 2 bar.

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Remove the dust cap from the bleed valve (1).
Connect the vent hose to the bleed valve (1).
Open bleed valve (1) and purge it until clear, bubble-free brake fluid emerges.
Close bleed valve (1).
Switch off bleeder unit or remove from brake fluid expansion tank.
Correct brake fluid level in expansion tank.

Disconnect the bleeder unit for the brake fluid

NOTE: RISK OF DAMAGE
Paint damage.
Mechanical or chemical action may lead to paint damage.

Cover up working area with specified covering material only.

Switch off bleeder unit (1) and remove it from the brake fluid expansion tank.
Check the brake fluid level and adjust it to the maximum mark if necessary.

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Check the seal of sealing cap (1) for correct fit and damage, replace if necessary.
Shut sealing cap (1).

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Follow-up work

Refer to INSTALLING THE TRIM PANEL FOR THE PEDAL ASSEMBLY .
Refer to INSTALLING THE COVER OF THE ENGINE COMPARTMENT ON THE REAR LEFT .