Second Hand Mercedes-Benz B-Class Brake Servo

Yes, all generations of the B-Class are fitted with a conventional vacuum-assisted brake servo as standard. The B-Class is a front-wheel-drive car and has always used a traditional brake servo mounted in the engine bay between the brake pedal and the master cylinder, so this is a genuine part to be sourcing. Later B-Class models (W247, from around 2018 onwards) use an electro-mechanical brake booster rather than a traditional vacuum servo, so if your car is from that generation you may need a different type of unit entirely — confirm with your breaker against your registration.

These two cars are from different generations — the W245 ran from 2005 to 2011, and the W246 ran from 2011 to 2018 — so a servo from a 2010 car is very unlikely to be compatible with a 2015 car. The mounting, vacuum line connections and master cylinder interface differ between generations, and the parts are not interchangeable. Always quote your registration to the breaker so they can pull the right unit for your exact generation.

Trim level alone does not affect brake servo fitment on the B-Class — the SE, Sport, and AMG Line are cosmetic and equipment packages rather than mechanical variants. What does matter is your engine size, as larger-engined variants may be paired with a higher-capacity servo to suit their braking system. Confirm the engine size with your breaker alongside your registration to make sure you get the correct unit.

Yes, engine size can be relevant because larger or more powerful engines are often paired with uprated braking systems that may use a different servo specification. Within the W246 generation (2011–2018) for example, a 2.0-litre diesel variant may carry a different servo to a 1.5-litre petrol model. Give your breaker your full registration so they can match the servo to your exact engine code, not just the model name.

The W246 received a facelift in 2015 rather than 2014, with updates mainly to styling, infotainment and equipment rather than to the fundamental braking hardware. In most cases the brake servo will be consistent across the pre- and post-facelift W246, but whether a specific unit crosses that boundary is something to confirm with your breaker against both registrations rather than assume. Name the facelift year and your engine size when you contact the breaker to be sure.

The B200d and B180 sit in the same W246 generation (2011–2018) but have different engine outputs, and the braking system specification can vary accordingly, meaning the servo may differ between them. Do not assume a like-for-like swap just because the body and generation match. Provide your breaker with both the donor and recipient registrations so they can cross-reference the part numbers before you commit to buying.