Fiat 500 (Petrol) Brake Discs: Specs, Fitment & Wear Symptoms

On the classic petrol 500, the real root cause is often the reaction frame corroding, not the disc itself, genuinely capable of seizing and bending pads.

Generation covered: this guide is for the classic petrol/hybrid 500 (2007–2024) — not the fully electric 500e (2020–present), which is a completely different car sharing no mechanical parts despite the similar styling. Check your logbook or VIN, or confirm whether your car has an engine or an electric motor, if you're unsure which one you have.

Illustration for editorial purposes

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OEM Part Number: confirm via VIN — front discs (aftermarket) Brembo 08.5085.11 / Bosch 0 986 479 B43

Accuracy note: Covers the Fiat 500 (Petrol) (2007- petrol 500) 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 08.5085.11 (240 x 11 mm, solid, 4 holes, coated, Prime line); Brembo 08.5086.11 (257 x 12 mm, solid, 4 holes, coated); Brembo 09.9772.11 (312 x 25 mm, vented, 5 holes, coated, high-carbon, Abarth); Bosch 0 986 479 B43 (257.2 x 22 mm, vented, 4 holes, coated, ECE-R90); Bosch 0 986 478 343 (257.5 x 12 mm, solid, 4 holes, oiled); ATE 24.0111-0119.1 (241 x 11 mm, solid, 4 holes, coated); ATE 24.0112-0127.1 (257.5 x 12 mm, solid, 4 holes, coated); ATE 24.0122-0197.1 (257.5 x 22 mm, vented, 4 holes, coated)
Disc sizes & variants	Four front sizes are listed. The 240 x 11 mm solid disc is fitted to the base 1.2 petrol; the 257 x 12 mm solid disc to the 0.9 TwinAir and some 1.3 Multijet cars; the 257 x 22 mm vented disc to the higher-output 0.9 TwinAir 105, 1.4 16v and later 1.3 Multijet cars; and the 312 x 25 mm vented five-hole disc to the Abarth. A 284 x 22 mm vented disc (Ridex 82B0216) is also listed for the 1.4 Abarth-derived fitment.
Genuine (OE) numbers quoted	None quoted in catalogue listings — order genuine discs against your VIN
Fitment notes	Minimum thickness is 9.2 mm for the 240 mm solid disc, 10.2 mm for the 257 mm solid disc, 20.2 mm for the 257 mm vented disc and 22 mm for the 312 mm Abarth disc. Solid and vented 257 mm discs share the same diameter and stud pattern, so check which type the car has before ordering.

A Genuinely Detailed, Expert-Level Explanation Worth Knowing — Fiat 500 (Petrol) 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.

A genuinely important warning worth knowing: using a pressure washer to try to clean this corrosion away won't work, and risks forcing water past the caliper seals, ruining the caliper entirely. The proper fix involves full disassembly to reach the reaction frame, cleaning with a wire brush, and applying copper grease specifically to the frame's sliding surfaces — skipping the grease has been documented to see corrosion return within about a week.

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 500 (Petrol) Brake Discs: Watch: Replacing It

🎬 Watch: How To Replace FIAT 500 Front Brakes, Pads and Discs Step By Step

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500 (2007-) front pads and discs

Fiat 500 (Petrol) Brake Discs reference plate

Fiat 500 (Petrol) Brake Discs: The Part That Pads Depend On

On the Fiat 500 (Petrol), wear on one of this pair accelerates wear on the other, so a pad change booked as routine maintenance often turns up discs that have quietly deteriorated alongside them.

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.

Fiat 500 (Petrol) 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 500 (Petrol) typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.

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Fiat 500 (Petrol) 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.