Second Hand BMW i7 Brake Master Cylinder

The BMW i7 is a fully electric vehicle with no internal combustion engine, and it does not use a conventional hydraulic brake master cylinder in the traditional sense — its braking system relies on an electro-hydraulic or brake-by-wire setup rather than a driver-operated master cylinder connected directly to the brake circuit. If you are searching for a brake master cylinder for your i7, you may actually be looking for the electro-hydraulic brake booster unit or integrated brake control module (sometimes called the iBooster or similar integrated unit), which performs the equivalent function on this car. We'd strongly recommend describing the exact component and its location to a breaker, quoting your registration, so they can identify the correct unit from the vehicle they are dismantling.

Because the i7 uses a brake-by-wire system, there is no standalone master cylinder to replace in the way you would on a conventional petrol or diesel car — the equivalent component is an integrated electro-hydraulic brake unit, and faults with it will typically show up as specific fault codes rather than a straightforward master cylinder failure. Before sourcing any parts, it is worth having the car properly diagnosed so you know exactly which module or actuator is at fault. Describe the fault codes and symptoms to the breaker alongside your registration so they can match the correct unit from a donor i7.

No — conventional BMW 7 Series models (such as the G11/G12 generation, 2015–2022, or the F01/F02 generation before that) use traditional hydraulic braking systems with a vacuum-assisted master cylinder, which is fundamentally incompatible with the i7's brake-by-wire architecture. The i7 (G70 platform, launched 2022) requires its own electro-hydraulic brake control unit, and parts from combustion-engined 7 Series models will not transfer across. Always quote your i7's registration to the breaker to ensure they are sourcing from the correct donor vehicle.

For the integrated brake control unit on the i7, trim and cosmetic specification do not affect fitment, but the drivetrain variant (rear-wheel drive eDrive50 versus all-wheel drive xDrive60 or M70) may influence which brake system components are fitted, given the significant differences in power and weight distribution between these variants. You should always confirm against your registration with the breaker rather than assuming all i7 variants share identical brake hardware. This is particularly important for the high-performance M70 xDrive, which is substantially more powerful and may carry upgraded brake system components.

Give the breaker your full registration number, explain that the i7 is fully electric and does not have a conventional master cylinder, and describe as precisely as possible which part of the brake system has failed — ideally with any fault codes your diagnostic scan has produced. Mentioning your drivetrain variant (eDrive50, xDrive60, or M70 xDrive) and the model year is also helpful, as the i7 range (G70, from 2022) may see component revisions over its production run. The more detail you provide, the better chance the breaker has of pulling the correct unit from a donor car.