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
| Front discs, KF generation, confirmed via Mazda's own service manual | 297mm diameter, vented, 28mm thickness |
|---|---|
| Rear discs, KF generation, confirmed via Mazda's own service manual | 303mm diameter, solid, 10mm thickness, 8mm minimum |
| 2.0 petrol variants, larger front option | 320mm diameter, vented, 28mm thickness, 26mm minimum |
| KE generation (2012-2017), front disc | Genuine Mazda reference: K011-33-251B |
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.
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: 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.
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.