Used Mercedes-Benz EQB Brake Master Cylinder

No — the EQB is a fully electric vehicle and does not have a conventional hydraulic brake master cylinder. Like most modern EVs, the EQB uses an electro-hydraulic or integrated brake booster unit (sometimes called an iBooster or similar electrohydraulic brake actuator) rather than a traditional vacuum-assisted master cylinder setup. If you are looking for the main braking control component, you should be searching for the integrated brake control module or electrohydraulic brake unit specific to the EQB, not a conventional master cylinder.

Almost certainly not — the term 'brake master cylinder' describes a component found on vehicles with conventional hydraulic braking systems, and the EQB does not use that setup. As a fully electric vehicle, the EQB's braking system is managed electronically via an integrated electrohydraulic unit, which is a fundamentally different and more complex assembly. We'd strongly recommend going back to your breaker and confirming the exact part number and description against your registration, as the correct part has a different name and function.

On the EQB you would be looking for the integrated brake booster and control unit — sometimes referred to by Mercedes as part of the iBooster or electrohydraulic brake system assembly, which combines the functions that a traditional master cylinder, booster, and ABS modulator would have performed separately on a conventional car. Because this is an EV-specific component and terminology can vary between breakers, it is worth quoting your registration and the Mercedes part number from your vehicle's documentation when approaching a dismantler. This type of unit is significantly more expensive than a traditional master cylinder, so confirming the exact part before purchase is essential.

Yes, variant can matter — the EQB was offered in both rear-wheel-drive and four-wheel-drive (4MATIC) versions with different power outputs, and the braking system hardware may differ between these drivetrains. Trim level names such as AMG Line do not affect the braking hardware, but the drivetrain configuration and motor output can, so always provide your registration to the breaker rather than just the model name. Colour and interior specification are irrelevant to fitment.

The Mercedes-Benz EQB (X243) launched in the UK for the 2022 model year and, as of the time of writing, sits within its first generation without a significant mid-life facelift that would be widely documented. However, because the electrohydraulic brake assembly is a complex electronic component, even minor mid-cycle software or hardware revisions can affect compatibility, so you should always confirm the part against your exact registration and build date with the breaker before purchasing. Never assume a like-for-like swap without that check.