Used BMW i4 Brake Discs

The BMW i4 is a fully electric vehicle but it does retain conventional hydraulic disc brakes on all four wheels — regenerative braking supplements but does not replace the physical brake discs and pads. So you genuinely do need brake discs for an i4, and finding used ones from a breaker is a perfectly normal search. The regenerative system means the discs often wear more slowly than on a petrol car, but they still wear and still need replacing.

The BMW i4 (G26) launched in the UK in 2021 and received a facelift in 2024, so you are currently within one generation but there is a pre-facelift (2021–2023) and a facelift (2024 onwards) split to be aware of. Whether brake discs cross that 2024 boundary is something you should confirm with the breaker against your exact registration, as running-gear updates can accompany facelifts. Stating the facelift year is straightforward; whether the specific disc dimensions changed is less certain and best verified on a part-number basis.

Yes, this matters significantly: the higher-output variants, particularly the M50 with its dual motors and greater weight and power, are likely to carry larger brake discs than the eDrive35 or eDrive40. Always tell the breaker which specific variant you have, not just 'BMW i4', so they can match the correct disc diameter and thickness. Assuming discs from a lower-output car will fit the M50 — or vice versa — is a common mistake worth avoiding.

Trim level alone does not determine brake disc fitment on the i4 — what matters is the drivetrain variant (eDrive35, eDrive40, M50) rather than whether the car is in M Sport, xLine, or standard specification. An M Sport i4 eDrive40 and a standard i4 eDrive40 should share the same disc, though M Sport cars may have had optional upgraded brakes fitted at order; confirm with the breaker against your registration to rule this out. Cosmetic differences like caliper colour are a trim thing and not your concern when sourcing the disc itself.

The 2024 facelift is a known change point for the G26 i4, and while the underlying platform is shared, brake specifications can be revised across a facelift cycle. We cannot state with confidence that pre-facelift discs (2021–2023) and post-facelift discs (2024 onwards) are interchangeable — this is exactly the kind of question to put to the breaker with both registrations to hand so they can cross-reference part numbers. Do not assume compatibility simply because both cars carry the i4 name.

For brake discs specifically, NS (nearside/left) and OS (offside/right) on the same axle are normally identical parts — unlike wishbones or driveshafts, discs are typically symmetrical. You should still specify the axle (front or rear) clearly when contacting a breaker, and confirm with them that the disc for your particular variant has no handed design features, just to be certain.