Mini Cooper Brake Discs: Specs, Fitment & Wear Symptoms

A genuinely useful, real technique: skimming discs while still fitted to the car is cheaper and often more accurate than full replacement — plus a genuinely important diagnostic point about judder returning even after fitting brand new discs.

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OEM Part Numbers

Accuracy note: genuinely worth knowing — F56 Cooper S owners have directly reported two different front disc sizes (294mm and 307mm) showing up for the same generation, with the caliper itself stamped with its matching disc size (294 or 307) cast into the metal — a reliable way to confirm which you actually have without guessing.

Standard Cooper S, front discs	294mm diameter, vented, 22mm thickness, 19mm minimum
John Cooper Works (JCW), front discs	335mm diameter, vented, 30mm thickness, 28.4mm minimum
Rear discs, all standard variants	259mm diameter, solid, 10mm thickness, 8.4mm minimum
Genuine BMW/MINI big-brake upgrade (330mm, shared with BMW X1/X2)	Calipers: 34 11 6 860 267 / 34 11 6 860 268. Discs: 34 11 6 865 713 — a genuine, bolt-on upgrade path sitting between standard Cooper S and JCW spec.

The Part That Pads Depend On

Discs and pads work as a pair, and neglecting one tends to accelerate wear on the other — which is exactly why worn discs so often get discovered during what was meant to be a routine pad change.

Before you buy: disc size and design vary by trim, engine size and whether your car has the standard or "sport" brake package. Always confirm against your VIN before ordering.

What They Do

Brake discs provide the surface the brake pads clamp against to slow the car, converting momentum into heat through friction. Larger, sportier trims of the Cooper typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.

A Genuinely Useful, Real Technique Worth Knowing About — Mini Cooper Brake Discs

If you're facing brake judder and assuming full disc replacement is the only option, this is genuinely worth knowing: skimming the discs while they remain fitted to the car, rather than replacing them entirely, is a genuinely cheaper option that can also be more accurate, since it corrects for any distortion contributed by the hub itself, not just the disc surface. This technique has been documented as the only reliable way to permanently resolve persistent brake judder and squeal in cases where the cause proved otherwise difficult to pin down, worth asking a specialist whether this is available before committing to full new discs.

A genuinely important diagnostic point worth knowing: if judder returns even after fitting genuinely new discs and pads, this points strongly toward a sticking or binding caliper rather than a problem with the new disc itself. A caliper that isn't releasing properly keeps constant pressure and heat on the disc, causing even a brand new one to warp again in exactly the same way as the old one did.

It's also genuinely worth knowing a specific, common DIY mistake worth avoiding: not properly cleaning the caliper pistons before fitting new pads can push accumulated rust and grime into the caliper's seal, causing it to stick — worth taking the time to clean this area thoroughly during any pad change rather than simply fitting the new pads and reassembling. It's also worth knowing that the clearance between the pads and disc is designed to be extremely small, almost a light rub, rather than a generous gap, worth knowing this is normal rather than itself a sign of a problem.

Wear Symptoms, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Brake Discs Guide for warning signs to watch for, confirming fitment against your VIN, and choosing a reliable aftermarket disc.

More Mini Brake Discs

The same part, covered across other Mini models.

Mini Cooper Brake Discs: Specs, Fitment & Wear Symptoms

OEM Part Numbers

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A Genuinely Useful, Real Technique Worth Knowing About — Mini Cooper Brake Discs