Remove hydraulic unit
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.
NOTE:
TECHNICAL INFORMATION
Maintain conditions of absolute cleanliness.
Maintain conditions of absolute cleanliness.
NOTE:
TECHNICAL INFORMATION
Before first working on the DSCi brake (integrated brake), the "DSCi" web-based training must be passed successfully.
The "DSCi" web-based training is started in the Learning Management System (TMSi).
Before first working on the DSCi brake (integrated brake), the "DSCi" web-based training must be passed successfully.
The "DSCi" web-based training is started in the Learning Management System (TMSi).
NOTE:
TECHNICAL INFORMATION
Before removing the hydraulic unit, the vehicle battery must be disconnected without fail!
The vehicle battery must never be connected during a repair!
Otherwise a brake bleeding procedure must be carried out after the repair.
For additional information: see 34 00... BRAKE BLEEDING PROCEDURE .
The vehicle battery may only be reconnected when the brake system is completely filled with brake fluid and vented!
Before removing the hydraulic unit, the vehicle battery must be disconnected without fail!
The vehicle battery must never be connected during a repair!
Otherwise a brake bleeding procedure must be carried out after the repair.
For additional information: see 34 00... BRAKE BLEEDING PROCEDURE .
The vehicle battery may only be reconnected when the brake system is completely filled with brake fluid and vented!
NOTE:
TECHNICAL INFORMATION
Use only BMW-approved brake fluids.
For additional information see: the "Fluid Capacities" tab for the selected vehicle.
Use only BMW-approved brake fluids.
For additional information see: the "Fluid Capacities" tab for the selected vehicle.
Preliminary work
- Refer to DISCONNECTING ALL BATTERY GROUND LEADS . .
- Refer to REMOVING THE SEAL FOR THE HOOD REAR .
- Refer to REMOVING THE COVER OF THE ENGINE COMPARTMENT AT THE REAR LEFT .
- Refer to REMOVING THE COVER OF THE REAR RIGHT ENGINE COMPARTMENT .
- Refer to REMOVING LEFT AND RIGHT WIPER ARM .
- Refer to REMOVING WINDSHIELD PANEL COVER .
- Refer to REMOVING TRAILING LINK AT SPRING BOLT .
- Refer to REMOVING THE TRIM PANEL FOR PEDAL ASSEMBLY .
- Disconnect plug connection (1).
- Remove the cable clip (2).
- Disconnect plug connection (1).
NOTE:
TECHNICAL INFORMATION
Do not interchange brake lines. Mark the brake lines before disassembly (for example, VL/VR/HR/HL) .
Do not bend brake lines.
Close off connecting bores with seal plugs.
Do not interchange brake lines. Mark the brake lines before disassembly (for example, VL/VR/HR/HL) .
Do not bend brake lines.
Close off connecting bores with seal plugs.
- Unfasten brake lines.
- Retract release tool 2 409 646 between brake pedal and brake booster.
- Place support (1) of the special tool (release tool) 2 409 646 on the bearing bracket. If necessary, position the support (1) permanently by turning the screws on the special tool.
- Push the special tool 2 409 646 in arrow direction and lever the brake pedal away from the brake booster.
- Loosen nuts (1).
- Remove hydraulic unit (1).