The build: what's on this S4 Avant
| Item | STOPFLEX front-axle build |
|---|---|
| Vehicle | Audi S4 Avant (B9) |
| Upgrade scope | Front axle, direct-fit rotor and pad upgrade |
| Caliper retained | Factory Akebono 6-piston fixed front calipers |
| Front rotor | 380 × 34 mm carbon ceramic, long-fiber construction |
| Pads | STOPFLEX low-dust ceramic compound |
| Wheel envelope | Retains factory 19-inch wheel package |
| Rotor weight | About half the weight of the same-size iron rotor |
Check your front caliper before you order
This kit is built for the S4 Avant B9 running the factory Akebono 6-piston front calipers with 380 mm rotors. It's not a universal B9 fit. If the car has aftermarket wheels or any prior brake changes, confirm your exact front package with us first.
Why front CCB makes sense here
| STOPFLEX feature | Why it matters on the S4 Avant B9 | What you notice |
|---|---|---|
| Carbon ceramic rotor, ~half the iron weight | The Avant carries weight over the nose, and the front axle does most of the stopping. Cutting rotor mass takes it off the worst spot for suspension response. | A lighter front end and crisper turn-in through quick direction changes. |
| Holds ~0.3μ friction at 900°C | Long descents and repeated high-speed stops cook iron rotors and soften the pedal. Carbon ceramic holds its friction where iron starts to fade. | A pedal that stays firm and linear deep into a string of hard stops. |
| Low dust with STOPFLEX pads | Open-spoke factory wheels show every bit of brake dust, and the S4 sees plenty of daily miles. | Wheels that stay clean far longer between washes. |
| Rotors don't rust | Iron rotors bloom orange after rain or a wash, especially on a car parked outside. | A clean rotor face behind the spokes year-round, no surface corrosion. |
| Keeps the factory Akebono caliper | The OEM 6-piston is already strong and matched to the car's hydraulics and ABS. Swapping it would mean reworking balance and calibration for no real street gain. | OEM-level integration and brake feel, with carbon ceramic behavior. |
What gets better
- Less unsprung weight at the front, so the nose feels lighter
- Consistent pedal across repeated high-speed braking
- Far less front wheel dust day to day
- No rust bloom on the rotor face after wet weather
- Street life of roughly 250,000–300,000 km off track
What to confirm first
- You're running the factory Akebono 6-piston front calipers
- The front rotors are the 380 mm factory size
- Your wheels are factory 19-inch, or you've confirmed clearance
- The car is otherwise close to factory front-brake spec
If you're not sure your car matches the spec shown here, send us your details and we'll confirm Audi S4 Avant B9 fitment before you order through our Audi CCB collection.
Build gallery
S4 Avant B9 CCB FAQ
Why upgrade only the front brakes on the Audi S4 Avant B9?
The front axle does most of the braking work, so a front-only carbon ceramic upgrade gives you the biggest gain in heat capacity, steering feel, and unsprung weight while leaving the factory rear setup alone.
Does this change brake balance or ABS behavior?
No. It is a direct-fit replacement for the factory 380 mm front rotor used with the OEM Akebono 6-piston calipers. Keeping the original rotor size and caliper layout preserves the intended brake balance and factory control-system behavior.
Do these carbon ceramic brakes need to warm up before they work?
No. With STOPFLEX pads, the first cold stop feels normal for everyday driving, even around -20°C, so you get predictable response from the moment you pull out of the driveway.
Will it clear the factory 19-inch wheels?
On an S4 Avant B9 running the factory 380 mm front brake package and OEM 19-inch wheels, this direct-fit rotor keeps the original wheel and caliper envelope. Confirm your exact spec with us before ordering.
How long do STOPFLEX carbon ceramic rotors last on the street?
On the street, not on track, STOPFLEX carbon ceramic rotors can last around 250,000 to 300,000 km, far longer than typical steel rotors, and they do not rust after rain.
