Peugeot 508 Brake Discs: Specs, Fitment & Wear Symptoms

On the 508, a genuine, dealer-confirmed fault causes brakes to overheat by not releasing fully — plus a real story of how cleaning and hard braking saved a full disc replacement bill.

Illustration for editorial purposes

OEM Part Numbers

Genuinely worth knowing: one owner directly reported seeing five different front disc sizes listed for their exact registration on a major parts retailer (340mm, 304mm, and several variants around 290mm) — the RPO number, tied to a specific build date cutoff around October 2011, is the reliable way to narrow this down rather than guessing from the model name alone.

Pre-October 2011 build (RPO up to 12774), front discs	340mm diameter, vented
Post-October 2011 build (RPO from 12775), front discs	304mm diameter, vented, 28mm thickness, 26mm minimum
Rear discs, most variants	290mm diameter, solid, 12mm thickness, 10mm minimum — genuine Zimmermann OE-equivalent reference: 440.3129.20
Current generation, rear discs	268mm diameter, solid, 12mm thickness, 10mm minimum

A Genuine, Confirmed Fault: Brakes That Don't Fully Release

If you're noticing a burning smell, a wheel that feels unusually hot after driving, or a wheel making noise that comes and goes seemingly at random, this is worth checking directly before assuming worn discs or pads: a genuine, dealer-confirmed fault exists where the brakes don't release fully from the disc after being applied, causing exactly this kind of overheating on one or more wheels. This has been documented as an out-of-warranty repair even on cars only around 1.5 years old, with a labour cost commonly in the £60-80 range. If you notice a wheel running hot or smelling of brakes after ordinary driving, it's worth raising this specific fault by name with a technician rather than assuming it's simply wear.

A genuine, real story worth knowing before paying for a full disc replacement: one owner was told at just 20,000 miles that an apparently warped front disc needed both discs and pads replaced, since it wasn't considered a warranted part. Before paying for this, they tried cleaning the pads and reapplying copper grease, then took the car for a drive specifically doing several rounds of hard braking once it was safe to do so — this resolved the vibration completely and saved what would otherwise have been a substantial bill. Rust building up on a disc's clean, unworn area (common on lower-mileage cars, or after the car's been standing in wet weather) can produce a vibration that feels exactly like a warped disc but isn't one.

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

Fitment & Compatibility

Disc size and specification vary by trim and braking package on the 508. 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 Peugeot 508 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 Peugeot Brake Discs Guides

The same part, covered across other Peugeot models.