Kits matched to your Audi

Audi A4 B9(8W) Big Brake Kits

  • 2017–2025

45 kits matched to this car · All Audi models

Fitment notes: Recommended rotor size by kit: 10N Ø420 × 40 mm (at least 21-inch wheels); 21Z Ø410 × 32 mm (at least 21-inch wheels); 5440 Ø330 × 28 mm (at least 17-inch wheels); 8657S Ø355 × 32 mm (at least 18-inch wheels); 8N Ø380 × 36 mm (at least 19-inch wheels); 9N Ø400 × 38 mm (at least 20-inch wheels); CP8520 Ø390 × 36 mm (at least 20-inch wheels); CP8560 Ø380 × 28 mm (at least 19-inch wheels); CP9040 Ø355 × 32 mm (at least 18-inch wheels); CP9540 Ø380 × 32 mm (at least 19-inch wheels); CP9561 Ø380 × 36 mm (at least 19-inch wheels); CTS-V Ø380 × 28 mm (at least 19-inch wheels); CTS-V Ø380 × 34 mm (at least 19-inch wheels); EB10 Ø420 × 40 mm (at least 21-inch wheels); EB4 Ø380 × 32 mm (at least 19-inch wheels); EB6 Ø380 × 36 mm (at least 19-inch wheels); EB8 Ø405 × 34 mm (at least 21-inch wheels); EC670 Ø380 × 34 mm (at least 19-inch wheels); EC690 Ø380 × 34 mm (at least 19-inch wheels); EMB6 Ø380 × 34 mm (at least 19-inch wheels); EP4S Ø380 × 28 mm (at least 19-inch wheels); ES4 Ø380 × 28 mm (at least 19-inch wheels); ES6 Ø355 × 32 mm (at least 18-inch wheels); FA-022 Ø355 × 32 mm (at least 18-inch wheels); FA-032 Ø355 × 28 mm (at least 18-inch wheels); FA-042 Ø380 × 34 mm (at least 19-inch wheels); GT-BM4 Ø380 × 28 mm (at least 19-inch wheels); GT-BM6 Ø380 × 34 mm (at least 19-inch wheels); GT-M4 Ø380 × 28 mm (at least 19-inch wheels); GT-M6 Ø380 × 34 mm (at least 19-inch wheels); GT-R4 Ø380 × 28 mm (at least 19-inch wheels); GT-R6 Ø380 × 34 mm (at least 19-inch wheels); GT-S4 Ø380 × 28 mm (at least 19-inch wheels); GT-S6 Ø380 × 34 mm (at least 19-inch wheels); GT350 Ø380 × 36 mm (at least 19-inch wheels); PISTA-FF6 Ø380 × 32 mm (at least 19-inch wheels); RC4 Ø380 × 28 mm (at least 19-inch wheels); RC6 Ø380 × 36 mm (at least 19-inch wheels); SL6 Ø355 × 28 mm (at least 18-inch wheels).
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Audi A4 (B9) brake kits, front and rear

Your Audi A4 (B9, 2017–2025) can take a kit at the front, the rear or both. Rear kits use 4-piston calipers from AP Racing, Alcon, Brembo and TTSPORT with 380–410 mm rotors. Front kits add Akebono and Endless to that list, with 4- to 10-piston calipers and 330–420 mm rotors recommended.

Matched to those rotors, front kits start at 17-inch wheels, but most need 19 inches or more and the biggest need 21. Rear kits need 19 to 21 inches. Because spoke shape and offset also affect fit, send your wheel details if unsure.

Every kit uses brackets made for the A4. Genuine Audi calipers are offered too, made by Akebono for the front and by Brembo for the rear, and genuine Cadillac calipers made by Brembo appear on both axles. Rotors are carbon ceramic or high-carbon steel. Most are street kits; a few are track kits.

Common questions — Audi A4 B9(8W)

Is there a rear big brake kit for the A4?
Yes. Rear kits use 4-piston calipers from AP Racing, Alcon, Brembo or TTSPORT with 380–410 mm rotors. At those rotor sizes they need 19- to 21-inch wheels.
Will 17-inch wheels work with an A4 brake kit?
Rarely. At the rotor size we recommend, front kits start at 17 inches, but most need 19 inches or more, and rear kits need 19 to 21 inches. Spoke shape and offset matter too, so send your wheel details.
What is in an A4 brake kit, and when does it ship?
Each kit covers one axle with two calipers, two rotors, pads, braided brake lines, mounting hardware and brackets made for this car. It is built to order and ships in about 15 business days.
Do any A4 kits use OEM calipers?
Yes. You can pick genuine Audi calipers, made by Akebono for the front or by Brembo for the rear. Genuine Cadillac calipers made by Brembo are another option on both axles.

Not sure what fits?

Send us your car and wheels. We'll tell you what fits.

Year, make, model, wheel size, and whether it's for the street or the track. We reply by email within one business day.

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