Mazda CX-5 Brake Discs: Specs, Fitment & Wear Symptoms

Confirmed: two real technical bulletins address poor rear disc wear — plus why Mazda's TCS braking balance and smaller rear pads genuinely wear the rears faster, and a damning real account of Mazda UK refusing warranty cover.

Illustration for editorial purposes

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OEM Part Number: K011-33-251B (genuine front disc — confirm via VIN) — aftermarket front discs Brembo 09.C654.11 / Bosch 0 986 479 B15

Accuracy note: Covers the Mazda CX-5 (KE 2012-2017) as listed in the UK aftermarket catalogues. Front brake discs are sold by diameter and thickness, and most models have two or three disc sizes depending on engine, brake size and trim — a 278 mm disc will not fit a car built with 300 mm brakes, so the caliper carrier and the disc must match. The references below are UK aftermarket catalogue listings for this generation, labelled by brand with diameter x thickness in mm; genuine numbers are shown only where a listing quotes one. Measure the old disc or check the brake size against your VIN before ordering, replace discs in pairs with new pads, and scrap any disc at or below its minimum thickness.

Front brake discs (aftermarket)	Brembo 09.C654.11 (297 x 28 mm, vented, 5 holes, coated, minimum 26 mm); Brembo 09.C654.75 (297 x 28 mm, vented, slotted, 5 holes, coated, minimum 26 mm); ATE 24.0128-0277.1 (297 x 28 mm, vented, 5 holes, coated, minimum 26 mm); ATE 24.0128-0323.1 (297 x 28 mm, vented, 5 holes, coated, minimum 26 mm); Bosch 0 986 479 B15 (297 x 28 mm, vented, 5 holes, oiled finish, ECE-R90, minimum 26 mm); TRW DF8052 (297 x 28 mm, vented, 5 holes); Zimmermann 370.3050.20 (297 x 28 mm, vented, 5 holes, coated, minimum 26 mm); Zimmermann 370.3050.52 (297 x 28 mm, vented, drilled, 5 holes, coated, minimum 26 mm).
Disc sizes & variants	One front size only, 297 mm x 28 mm vented, across the 2.0 and 2.5 petrol and 2.2 diesel KE range, shared with the Mazda 6 GJ. The 303 mm discs are solid rears.
Genuine (OE) numbers quoted	K011-33-251B (genuine front disc number for this model — confirm via VIN, as several disc sizes exist)
Fitment notes	Every KE CX-5 takes the 297 mm front disc with a 26 mm minimum thickness; the Ridex 82B0760 and Stark budget discs are restricted to cars built up to 11/2016. Five-stud, 114.3 mm bolt circle, 68 mm centre bore.

Confirmed: Real Technical Bulletins Addressing This Exact Issue — Mazda CX-5 Brake Discs

This is genuinely worth knowing if you're seeing premature rear disc corrosion or uneven wear: Mazda has issued at least two confirmed technical service bulletins specifically addressing poor rear brake disc wear (referenced as MC-10183590-0001 from 2020 and MC-10232276-0001 from 2023). Genuinely worth knowing why this happens in the first place: forum discussion among experienced owners points toward the rear brakes being applied harder and sooner than the fronts in some conditions, as a result of how Mazda's traction control system balances braking — combined with genuinely smaller rear pads that some owners believe may be under-specced for how much work they're actually doing. This combination means the rear brakes see more use than on a typical car, wearing the pads down faster and leaving less material to protect the discs from corrosion between uses.

A genuinely specific maintenance detail worth knowing: Mazda's own guidance specifically calls for copper anti-seize to be applied to the pad clip surfaces, not just the sliding pins — worth confirming this step wasn't skipped during your last pad or disc replacement if premature rear corrosion keeps recurring.

It's also genuinely worth knowing about a real, honest, and rather damning consumer account: one owner, facing premature rear disc corrosion at just two years old and around 10,700 miles, was told directly by Mazda UK that they were "washing their hands of it," declining warranty coverage and calling it fair wear and tear. The same owner noted they'd previously owned several VW Golfs and Seats with similar mileage and age and never experienced anything comparable. If you're facing a similar dismissal for genuinely premature corrosion, it's worth referencing the confirmed technical bulletins above directly, since they demonstrate Mazda's own awareness of a wider pattern rather than this being an isolated case of "normal" wear.

Mazda CX-5 Brake Discs: Watch: Replacing It

🎬 Watch: 2014 Mazda CX-5 Front Brake & Rotor Replacement 2013-2018 (Fix Steering Shake When Braking)

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KE generation

Mazda CX-5 Brake Discs: The Part That Pads Depend On

On the Mazda CX-5, discs and pads don't wear independently — neglect one and the other degrades faster too, which is exactly why what starts as a routine pad change frequently turns into a disc replacement as well.

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.

Mazda CX-5 Brake Discs: 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 CX-5 typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.

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Mazda CX-5 Brake Discs: 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 Mazda Brake Discs

The same part, covered across other Mazda models.