Citroen C5 Aircross Brake Discs: Specs, Fitment & Wear Symptoms

On the C5 Aircross, a genuine Citroën Technical Bulletin fixes a specific rear brake sticking fault — plus a real consumer-rights point about aftermarket parts and warranties.

Illustration for editorial purposes

OEM Part Numbers

Accuracy note: confirmed consistently across multiple petrol, diesel, and hybrid variants — dimensions are shared across the range, so this applies broadly regardless of exact engine.

Front discs, all standard variants	304mm diameter, vented, 28mm thickness, 26mm minimum
Rear discs, all standard variants	290mm diameter, solid, 12mm thickness, 10mm minimum
Note	These dimensions apply consistently across 1.2 PureTech petrol, 1.6 THP petrol, BlueHDi diesel, and Hybrid variants — a genuinely simpler picture than many rivals with more size variation across their range.

Confirmed: A Genuine Citroën Technical Bulletin Covers a Specific Sticking Fault — Citroen C5 Aircross Brake Discs

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 C5 Aircross Brake Discs reference plate

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.

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 C5 Aircross typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.

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.

Citroen C5 Aircross Brake Discs: Specs, Fitment & Wear Symptoms

OEM Part Numbers

Confirmed: A Genuine Citroën Technical Bulletin Covers a Specific Sticking Fault — Citroen C5 Aircross Brake Discs

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