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Mercedes-Benz B-Class Brake Master Cylinder Replacement Parts

Compare prices on a used Mercedes-Benz B-Class brake master cylinder from UK breakers. Free part request, no obligation.

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Choosing the right used Mercedes-Benz B-Class brake master cylinder

Used brake master cylinders vary between vehicles - and whether you call it used, second hand or a replacement, matching the right one matters. These are the details breakers need to match the right part to your car - our request form asks them so you only hear from suppliers with the correct part:

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Fitment questions

Does the Mercedes-Benz B-Class actually have a brake master cylinder?

Yes, all variants of the Mercedes-Benz B-Class have a brake master cylinder — it is a fundamental hydraulic component present on every car with a conventional brake system, and the B-Class is no exception across all of its generations. The B-Class has used standard hydraulic braking throughout its production, so there is no variant that lacks this part.

Will a brake master cylinder from a first-generation B-Class (W245, 2005–2011) fit a second-generation B-Class (W246, 2011–2018)?

These are entirely different platform generations — the W245 ran from 2005 to 2011 and the W246 from 2011 to 2018 — and the brake master cylinders are not the same part. You should source a unit from the correct generation and, because bore size can vary with engine and braking specification, confirm the exact compatibility with the breaker against your registration number before buying.

Does engine size affect which brake master cylinder I need on the B-Class?

It can do, because larger or more powerful engines are often paired with a higher-specification braking setup that uses a different master cylinder bore size. When sourcing a used unit, give the breaker your full registration so they can confirm the correct specification for your engine variant rather than assuming all B-Class cylinders are identical.

Does the trim level affect which brake master cylinder fits my B-Class — for example, Sport versus SE?

Trim level alone does not determine the brake master cylinder specification on the B-Class — the part is driven by the generation and engine size, not by whether the car is badged SE, Sport, or Urban. That said, higher trims sometimes carried larger engines, so it is the engine specification that matters, not the trim name itself; confirm against your registration with the breaker to be sure.

Will a brake master cylinder from a pre-facelift W246 (2011–2015) fit a post-facelift W246 (2015–2018)?

The W246 received a facelift around 2015 and while the underlying platform remained the same, brake specifications can be revised mid-generation and it cannot be assumed the master cylinder crosses over without checking. Name the generation boundary to your breaker and ask them to verify the part number against your specific registration before purchasing.

What should I check when buying a used B-Class brake master cylinder from a breaker?

Give the breaker your vehicle registration number so they can confirm the generation — W245 (2005–2011) or W246 (2011–2018) — and the engine size, as these are the key fitment factors for this part. Colour and trim level are irrelevant to fitment, but do ask the breaker about the condition of the reservoir and seals, as these are critical to safe brake system operation on a used unit.