The Versatile Upgrade: An Audi S4 (B9) STOPFLEX Carbon-Ceramic Rotor System
The Audi S4 (B9) is the definitive "sleeper" sedan, offering sophisticated luxury and potent, all-weather performance. For enthusiasts looking to unlock the next level of dynamic capability, the braking system is a critical area for enhancement. This case study demonstrates the versatility and performance of the **STOPFLEX Front-Axle Carbon-Ceramic Rotor Kit**.
The Flexible Front-Axle Rotor System
Our STOPFLEX Rotor Kit is engineered for ultimate flexibility. It serves as a direct-fit, high-performance replacement for the stock iron rotors using the factory S4 calipers. Furthermore, as shown in this case study, it is also fully compatible with popular aftermarket big brake kits—such as the **ALCON system pictured**—for drivers seeking the absolute maximum in braking performance.
- Vehicle: Audi S4 (B9)
- Front Rotors: STOPFLEX 380mm Carbon-Ceramic Discs with custom-fit billet aluminum hats
- Brake Pads: STOPFLEX Performance Pads formulated for Carbon-Ceramic
- Brake Lines: STOPFLEX Stainless Steel Braided Lines
Key Advantages for the B9 S4 Platform
This upgrade provides a multi-faceted improvement, enhancing the S4's agility, endurance, and day-to-day refinement.
- Dramatically Reduced Unsprung Mass: Our carbon-ceramic discs are **up to 50% lighter than the factory iron rotors**. This substantial weight reduction from the front axle makes the S4 feel lighter on its feet, providing a noticeable improvement in steering feel and suspension compliance for a more connected driving experience.
- Consistent Performance for Demanding Drives: The factory iron brakes can experience fade during sustained, spirited driving. The superior thermal capacity of our carbon-ceramic system ensures consistent, powerful braking bite, lap after lap on the track or turn after turn on a canyon road.
- A Refined Experience for Daily Driving: This system enhances the S4's luxury character. Our low-dust pad formulation keeps the 19-inch wheels pristine, while the 100% corrosion-proof rotors eliminate the unsightly rust and potential noise associated with iron discs after washing or rain.
- The Foundation for Future Upgrades: The compatibility with both OEM and aftermarket calipers like ALCON means our rotor kit is a future-proof investment. You can enjoy immediate benefits with your factory setup and know that your rotors are ready for even more serious hardware if you choose to upgrade calipers later.
Installation Gallery
