Get quotes for a used or replacement Mercedes-Benz S-Class brake master cylinder. Genuine second hand parts from UK vehicle dismantlers - free request, breakers with stock reply direct.
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Fitment on a used brake master cylinder varies by vehicle, so a bit of detail goes a long way. Our request form covers what breakers need to know, so every quote you get back is for the correct part:
These are two distinct generations — the W220 ran from 1998 to 2005 and the W221 from 2005 to 2013 — and the master cylinders are not a direct swap between them. The brake systems were redesigned across the generational change, so a W220 unit should not be assumed to fit a W221. Always confirm the exact part number with the breaker against your specific registration before ordering.
The W221 received a facelift in 2009, but whether the brake master cylinder changed across that update is not something that can be confirmed as fact here — it may or may not be identical. Name the facelift year to the breaker and ask them to cross-reference the part number against your registration to be sure.
Yes, engine size can matter — larger-engined variants such as the S500 or S600 often have uprated braking systems to suit their greater weight and power compared to an S320 or S350. This means the master cylinder may differ between engine variants even within the same generation. Tell the breaker your exact engine size alongside your registration so they can supply the correct unit.
It can matter, because higher-output variants like the S500 and S600 may run larger brake components than the S350, and the master cylinder bore size can differ accordingly. Trim level itself does not affect fitment, but the engine size behind that trim designation does. Give the breaker your full engine specification and registration rather than just the trim badge.
All Mercedes S-Class variants across the W220, W221, and W222 generations use a conventional hydraulic braking system with a brake master cylinder, so the part does genuinely exist on this model. Some variants also incorporate a separate brake booster or vacuum pump, but the master cylinder is present regardless of engine type. A breaker will be able to supply the correct unit once they have confirmed your registration.
AMG variants such as the S55 or S63 use significantly uprated braking hardware, and the master cylinder on an AMG model may well differ from that of a standard S350 or S500 in the same generation. You should not assume a master cylinder from a non-AMG car will cross over to an AMG model or vice versa. Confirm with the breaker using your registration number so they can match the correct specification.