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

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.

The Part That Pads Depend On

Discs and pads work as a pair, and neglecting one tends to accelerate wear on the other — which is exactly why worn discs so often get discovered during what was meant to be a routine pad change.

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.

OEM Part Numbers

Accuracy note: confirmed for the current C4 III (2021 onward). Front disc diameter and specification vary slightly by engine and trim — confirm against your VIN before ordering.

Front disc, 282.6mm vented	PSA/Citroen OEM: 4246W2, 4246W8, 424917, 424918, 424984
Alternative front disc reference (282.9mm)	PSA/Citroen OEM: 1606401480, 1613703980, 1618862780, 1667857480

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.

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.

Fitment & Compatibility

Disc size differs between different generations of the C4, and again between standard and performance-tuned braking packages. Always confirm the exact disc size and design fitted to your specific trim before ordering. Whether you're sourcing a replacement brake discs for your Citroen C4 from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying.

Common Wear Symptoms

Vibration or pulsing through the brake pedal — often a sign of warped discs, usually from excessive heat build-up.
Visible grooves or scoring on the disc surface — indicates the pads have worn down to metal and are cutting into the disc itself.
Squealing that persists even with new pads — can point to a rough or glazed disc surface needing replacement.
Longer stopping distances despite good pads — worn or warped discs reduce effective braking surface contact.

DIY Replacement Difficulty

This is a moderate DIY job for someone comfortable with basic tools and a jack, typically done alongside a pad replacement since the caliper needs removing either way. Rear discs on cars with an electronic parking brake may need a specific tool or diagnostic device to retract the caliper. Expect 45–90 minutes per side including pads.

OEM vs. Aftermarket

Reputable aftermarket brake discs are widely regarded as safe and effective, provided they carry proper certification and match the correct size and design for your trim. As with pads, this is a part worth not cutting corners on — budget unbranded discs are a common source of premature warping and noise complaints.

More Citroen Brake Discs Guides

The same part, covered across other Citroen models.