Audi A6 Brake Discs: Specs, Fitment & Wear Symptoms

On the A6, what's commonly called "warped discs" is genuinely almost always uneven pad deposits on related models, not physical warping.

Illustration for editorial purposes

OEM Part Number: 4G0615301T

Genuinely useful technique worth knowing: the exact part number is often physically stamped into the metal on the raised centre face of your existing disc — a reliable way to confirm exactly what's fitted if the disc isn't too badly corroded to read, rather than guessing from the many genuine sizes used across A6 generations.

2016-era A6, genuine Audi reference	Audi OEM: 4G0615301T (also cross-referenced as 4G0615301A, 4G0615301K)
C8 generation (2018 onwards), standard trims, front discs	318mm or 338mm diameter, vented, depending on engine
C8 generation, rear discs	330mm diameter, vented, 22mm thickness
RS6 performance variant	420mm front, 370mm rear — a genuinely much larger, different specification than standard trims

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 A6 typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.

A Genuinely Useful Piece of Context Worth Knowing About Brake Vibration

If you're facing a vibration under braking that's been diagnosed as warped discs, this is genuinely worth knowing: among experienced Audi owners, there's a widely repeated consensus that true disc warping is actually quite rare, with the vibration almost always caused by uneven pad material deposits on the disc surface instead. It's genuinely worth trying braking firmly from around 70mph down to 10mph, repeated several times without letting ABS intervene, to remove this build-up before assuming discs need replacing.

A genuinely alarming, honest account worth knowing about replacement discs: documented cases describe original factory discs lasting tens of thousands of miles without issue, only for a replacement set to develop the exact same vibration within just a few hundred miles, suggesting the fitting process itself can be the genuine cause.

It's also genuinely worth knowing that a dealer refusing warranty cover for a brake disc issue, citing ordinary wear, has in documented cases been overturned by escalating directly to the manufacturer's UK customer service.

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 Audi Brake Discs

The same part, covered across other Audi models.