Used BMW Z4 Brake Discs

Yes, brake discs are fitted to all variants of the BMW Z4 – front and rear – across every generation of the car. The Z4 is a rear-wheel-drive two-seater roadster and coupé, so it has a conventional disc brake setup at all four corners on every model sold in the UK. You'll need to confirm the correct size with the breaker by quoting your registration, as disc diameter can vary between engine variants.

The Z4 ran across two distinct generations: the E85/E86 (2003–2009) and the G29 (2019 to present), with no direct mechanical carry-over between them, so discs from one generation will not cross to the other. Even within the E85 generation, disc sizes varied with engine – the 3.0i and M Roadster ran larger brakes than the smaller-engined 2.0i and 2.5i variants. Always give the breaker your registration so they can confirm the exact diameter and fitment for your specific car. Never assume year-for-year compatibility without checking.

Trim level alone – for example sDrive20i versus sDrive30i in the G29 – does not determine brake disc fitment; what actually matters is the engine variant, since larger and more powerful engines are typically paired with bigger braking setups. On the G29 Z4, the M40i carries noticeably larger discs than the 20i, so engine code is the key detail to pass to the breaker. Trim-level cosmetic differences such as alloy wheel design have no bearing on which disc is fitted.

The E85 Z4 ran from 2003 to 2009, but whether brake specification changed at any point mid-generation – particularly around the 2006 facelift – is something you should confirm with the breaker against your registration rather than assume. Engine size remains the clearest guide within this generation: the 3.0si and earlier 3.0i units typically used larger discs than the four-cylinder and smaller six-cylinder cars. Give the breaker your full registration and engine code so they can match the correct disc diameter and fitment to your car.

No – front and rear brake discs on the BMW Z4 are different sizes and are not interchangeable; fronts are always larger to handle the greater braking load. When sourcing from a breaker, always specify whether you need NS (nearside, left) or OS (offside, right) as a pair, and state front or rear clearly. Confirm the exact fitment against your registration to make sure you receive the correct size for your engine variant.

The Z4 M variants (fitted with the S54 straight-six engine) used significantly larger and uprated brake discs compared to the standard E85 Z4 range, and the parts are not interchangeable. If you're sourcing discs for an M Roadster or M Coupé, make this clear to the breaker because standard Z4 discs will not be a correct replacement. Always quote your registration and engine code to avoid being supplied the wrong part.