Fiat 500X Brake Discs: Specs, Fitment & Wear Symptoms
On the 500X, the real root cause is often the reaction frame corroding, not the disc itself, genuinely capable of seizing and bending pads.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — front discs (aftermarket) Brembo 09.A721.11 / Bosch 0 986 479 C42
| Front brake discs (aftermarket) | Brembo 09.A721.11 (281 x 26 mm, vented, 5 holes, coated); Brembo 09.9363.21 (305 x 28 mm, vented, 5 holes, coated); Bosch 0 986 479 C42 (281 x 26 mm, vented, 5 holes, coated, high-carbon); Bosch 0 986 479 G89 (305 x 28 mm, vented, 5 holes, coated, high-carbon); TRW DF6450 (281 x 26 mm, vented, 5 holes, painted); ATE 24.0126-0168.1 (281 x 26.2 mm, vented, 5 holes, coated); ATE 24.0128-0292.1 (305 x 28 mm, vented, 5 holes, coated); Ferodo DDF1956C (281 x 26 mm, vented, 5 holes, coated) |
|---|---|
| Disc sizes & variants | Two vented front sizes, 281 x 26 mm and 305 x 28 mm, both five-hole on a 110 mm bolt circle. The 281 mm disc is the fitment on the 1.3 and 1.6 petrol and 1.3 and 1.6 Multijet cars; the 305 x 28 mm disc is used on the 1.4 MultiAir 140 and 170, the 2.0 Multijet and the four-wheel-drive versions. A 278 x 12 mm solid disc (TRW DF4477) is also listed but relates to the lowest-powered variant. |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine discs against your VIN |
| Fitment notes | Minimum thickness is 24.2 mm for the 281 x 26 mm disc and 26 mm for the 305 x 28 mm disc. A drilled Brembo Xtra 09.A721.1X is available in the 281 mm size. Check the fitted diameter before ordering. |
A Genuinely Detailed, Expert-Level Explanation Worth Knowing — Fiat 500X Brake Discs
If you're facing recurring corrosion-related brake problems, this is genuinely worth understanding: a detailed, real explanation from an experienced owner traces the actual root cause to the reaction frame — the metal bracket the pads slide within, distinct from the disc or pad — being made from a grade of cast iron with genuinely low corrosion resistance. In the worst documented cases, pads can seize solid within the frame, with hydraulic pressure then physically bending the pad.
It's also genuinely worth knowing that brake disc corrosion is generally worse on cars that sit unused for extended periods, since regular driving naturally polishes surface corrosion away.
Fiat 500X Brake Discs: Watch: Replacing It
No 500X or Jeep Renegade front-disc video surfaced in 3 searches; Fiat 500 is a different platform, treat as general guidance only.
Fiat 500X Brake Discs: The Part That Pads Depend On
On the Fiat 500X, 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.
Fiat 500X 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 500X typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.
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Fiat 500X 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 Fiat Brake Discs
The same part, covered across other Fiat models.