Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2000 BMW 740iFACTORY OEM SERVICE PROCEDURE
Hydraulic Unit: Removal
- Turn off ignition. Remove negative battery cable.
- Draw brake fluid out of expansion tank with a suction bottle reserved for exclusive use with brake fluid.
- Unlock central connector (1) and pull off. Unfasten nut (2) and remove ground wire. See Fig 1 .
- Before removing, mark brakelines for reassembly reference. Remove brakelines. Note location of diaphragm flow damper (1). See Fig 2 .
- Unfasten screw and remove hydraulic control unit. See Fig 3 .
NOTE:
Keep brake fluid out of cable connector.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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