Audi A4 Brake Discs: Specs, Fitment & Wear Symptoms
A genuinely important consensus: what's commonly called "warped discs" is almost always uneven pad deposits, not physical warping — plus a genuine hard-braking fix, and an alarming account of genuine replacement discs developing the same fault within 500 miles.
Illustration for editorial purposes
Opens live listings in a new tab.
OEM Part Number: 8W0615301AB (genuine front disc — confirm via VIN) — aftermarket front discs Brembo 09.A820.11 / Bosch 0 986 479 467
| Front brake discs (aftermarket) | Brembo 09.A820.11 (314 x 25 mm, vented, 5 holes, coated, high-carbon, min 23 mm); Bosch 0 986 479 467 (314 x 25 mm, vented, 5 holes, coated, high-carbon, min 23 mm); ATE 24.0125-0184.1 (314 x 25 mm, vented, 5 holes, coated, high-carbon, min 23 mm); TRW DF4866S (314 x 25 mm, vented, 5 holes, black painted, high-carbon); Brembo 09.A758.11 (320 x 30 mm, vented, 5 holes, coated, high-carbon, min 28 mm); Zimmermann 100.3355.52 (320 x 30 mm, vented, 5 holes, Sport Coat Z coated, high-carbon, drilled, min 28 mm); Brembo 09.B970.11 (345 x 30 mm, vented, 5 holes, coated, high-carbon, min 28 mm) |
|---|---|
| Disc sizes & variants | On the B8 three front sizes are listed, 314 mm, 320 mm and 345 mm. The 314 x 25 mm disc is the standard fitment for the 1.8 TFSI, 2.0 TFSI and 2.0 TDI cars, the 320 x 30 mm disc goes on the higher-output and quattro cars such as the 3.0 TDI, and the 345 x 30 mm disc is the S4 and 3.0 TFSI size. On the B9 the standard disc is again 314 x 25 mm, with 318 x 30 mm (Brembo 09.D058.11), 338 x 30 mm (Brembo 09.D059.11) and 349 x 34 mm (Brembo 09.D423.11, S4) listed for the larger-engined cars. |
| Genuine (OE) numbers quoted | 8W0615301AB (genuine front disc number for this model — confirm via VIN, as several disc sizes exist) |
| Fitment notes | Minimum thickness is 23 mm for the 314 mm disc and 28 mm for the 320 mm and 345 mm discs; Brembo quotes 120 Nm wheel bolt torque. The 314 mm disc is shared between the B8 and B9 saloons, so Brembo 09.A820.11, ATE 24.0125-0184.1 and TRW DF4866S fit both; on the B9 ATE also offers the PowerDisc 24.0325-0184.1. The Ridex 82B0270 (314 mm) and 82B0744 (320 mm) budget discs are uncoated and limited to cars built up to November 2016. |
Audi A4 Brake Discs: The Part That Pads Depend On
On the Audi A4, because discs and pads wear as a pair, neglecting one speeds up wear on the other — which explains why a routine pad change so often turns up discs that are further gone than expected.
Audi A4 Brake Discs: Watch: Replacing It
B8 discs; alt i00ZIJSOA8w (2010-2015 B8 pads+rotors). No B9-specific disc video found in these searches.
Audi A4 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 A4 typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.
Opens live listings in a new tab.
A Genuinely Important, Honest Consensus Worth Knowing — Audi A4 Brake Discs
If you're facing a vibration under braking that's been diagnosed as warped discs, this is genuinely worth knowing: among experienced owners, there's a widely repeated consensus that true disc warping is actually quite rare, and the vibration you're feeling is almost always caused by uneven deposits of pad material building up on the disc surface, rather than the disc itself physically warping. This distinction genuinely matters, since it means a full disc replacement isn't always necessary. It's genuinely worth trying a specific technique first: braking firmly from around 70mph down to 10mph, repeated eight to ten times without letting ABS intervene, with time to cool between attempts, can remove this kind of uneven deposit build-up and resolve the vibration without replacing anything.
It's also genuinely worth knowing an honest, real account worth being aware of regarding warranty cover: one documented UK case saw a dealer initially refuse warranty coverage for a brake disc issue, citing it as ordinary wear, despite the car being well within its warranty period and having covered only 5,000 miles. Escalating the complaint directly to the manufacturer's UK customer service resulted in the dealer accepting a share of responsibility, with the owner ultimately paying only £200 of a bill exceeding £900 — worth persisting with an escalation rather than accepting an initial refusal at face value if a genuine fault seems to have developed unusually early.
Audi A4 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 Audi Brake Discs
The same part, covered across other Audi models.