Citroen C4 Brake Discs: Specs, Fitment & Wear Symptoms

On the C4, a genuine Citroën Technical Bulletin fixes a specific rear brake sticking fault — plus a real consumer-rights point about aftermarket parts and warranties.

Generation covered: this guide is for the current C4 (launched 2021, facelifted 2024), with particular focus on 2021–2023 registered examples now old enough for parts to be a common search. Check your logbook or VIN if you're unsure which generation you have.

Illustration for editorial purposes

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Confirmed: A Genuine Citroën Technical Bulletin Covers a Specific Sticking Fault

If you're experiencing a distinct crunch or clunk when pulling away after releasing the handbrake, this is genuinely worth knowing: Citroën has a documented Technical Service Bulletin covering exactly this fault, involving fitting steel brake shields to the rear discs. These shields are specifically designed to prevent mud, grit, and road debris from building up and binding against the disc, which causes the pad to bind slightly in the carrier and produces the characteristic crunch on release. Multiple owners confirm dealers fitting these shields under warranty once the fault was recognised — worth asking your dealer directly whether this fix has been applied to your car if you're experiencing this specific symptom.

An honest caveat worth knowing: the shields address the sticking and crunching symptom specifically, but don't necessarily solve the underlying rear disc corrosion problem — one owner who had the shields fitted still found the discs badly pitted, grooved, and rusted a few months later, despite the shields being in place. If you're dealing with both symptoms, it's worth treating them as two separate issues rather than assuming the shield fix alone resolves everything.

It's also genuinely worth knowing your consumer rights here: fitting quality aftermarket discs and pads (Brembo is specifically and repeatedly recommended by owners as resolving the corrosion problem where standard-fit discs kept rusting) does not invalidate an extended warranty — warranty conditions relate to the car being serviced according to schedule, not to exclusively using manufacturer-branded parts, and a dealer cannot legally enforce a parts-only restriction as a condition of warranty coverage.

Citroen C4 Brake Discs: The Part That Pads Depend On

On the Citroen C4, it's a paired system: let either one wear too far and the other suffers for it, which is why so many "just a pad change" jobs end up including discs once a mechanic actually looks.

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.

Citroen C4 Brake Discs: Watch: Replacing It

🎬 Watch: Citroen C4 front brake disk and pads replacement (older gen)

Watch on YouTube ↗

Earlier C4 hatch; no C4 III (2021-) front disc video found.

OEM Part Number: 4246W2 (genuine front disc — confirm via VIN) — aftermarket front discs Brembo 09.9619.11 / Bosch 0 986 479 C72

Accuracy note: Covers the Citroen C4 (III 2020 on) 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 09.9619.11 (283 x 26 mm, vented, 4 holes, coated, Prime line); Brembo 09.A185.11 (302 x 26 mm, vented, 4 holes, coated, high-carbon, Prime line); Bosch 0 986 479 C72 (301.8 x 26 mm, vented, 4 holes, coated, high-carbon, ECE-R90); TRW DF4183 (283 x 26 mm, vented, 4 holes, painted, high-carbon); febi bilstein 21121 (283 x 26 mm, vented, 4 holes, coated); febi bilstein 108680 (302 x 26 mm, vented, 4 holes, coated); Brembo 09.9619.1X (283 x 26 mm, vented, drilled, coated, high-carbon, Xtra line)
Disc sizes & variants	Two front sizes, 283 x 26 mm and 302 x 26 mm, both vented with four holes on a 108 mm bolt circle and a 66 mm centring bore. The 283 mm disc is the mainstream fitment and the 302 mm disc goes on the higher-output engines and the heavier variants. Both are 26 mm thick, so only the diameter separates them.
Genuine (OE) numbers quoted	4246W2 (genuine front disc number for this model — confirm via VIN, as several disc sizes exist)
Fitment notes	Minimum thickness is 24 mm for both sizes (24.5 mm for the drilled Brembo Xtra). No solid front discs are listed. Measure the fitted disc diameter before ordering because the listings are not broken down by engine.

This platform is shared across several Stellantis models (Peugeot, Vauxhall, DS), so these part numbers are widely stocked and generally competitively priced. Confirm your exact disc diameter against your existing part before ordering, since two closely related specifications exist across the range.

Citroen C4 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 C4 typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.

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Citroen C4 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 Citroen Brake Discs

The same part, covered across other Citroen models.