The Porsche 911 (991) is the benchmark for sports car precision. Whether it's a Carrera S, GTS, or Turbo, the chassis is capable of incredible speed. However, for owners who frequent the track or demanding canyon roads, the standard iron brakes can become the limiting factor—adding unsprung weight and eventually succumbing to fade. This owner chose to unlock the full potential of their 911 with a pro-level 10-piston Akebono front brake conversion paired with StopFlex Carbon-Ceramic rotors.
The Struggle
Even the excellent factory Porsche brakes have limitations when pushed to the absolute limit:
- Thermal Saturation: On technical tracks, standard 6-piston iron brakes can struggle to shed heat fast enough, leading to fluid boil and a soft pedal.
- Unsprung Mass: The 911's steering is legendary, but heavy iron rotors dull its feedback. Reducing rotating mass is the most effective way to sharpen turn-in response.
- Brake Dust: For a car that looks this good, the constant accumulation of corrosive black dust on the wheels is a major frustration for meticulous owners.
Technical Specification
This is a full-vehicle Big Brake Kit (BBK) designed to provide PCCB-level performance at a fraction of the factory retrofit cost, fitting perfectly inside 20-inch wheels.
| Vehicle | Porsche 911 (991) |
|---|---|
| Front Calipers | Akebono 10-Piston Fixed Calipers |
| Front Rotors | StopFlex C/SiC (410 x 36 mm / 16.1 in) |
| Rear Calipers | Brembo 4-Piston Fixed Calipers |
| Rear Rotors | StopFlex C/SiC (400 x 28 mm / 15.7 in) |
| Pad Material | StopFlex Track & Street Ceramic Compound |
Compatibility Redline
This is a Custom Big Brake Kit (BBK) application. It replaces the factory 6-piston front calipers with massive 10-piston Akebono units (commonly found on the Cayenne Turbo S or Panamera Turbo S). The StopFlex rotors are engineered to pair specifically with this upgraded caliper setup.
Engineering Validation
1. 10-Piston Clamping Force
Upgrading to the massive 10-piston front caliper provides a significant increase in pad surface area and clamping uniformity. This ensures that brake torque is applied evenly across the large 410mm rotor, maximizing friction and modulation capabilities at the limit of adhesion.
2. Superior Thermal Stability
StopFlex rotors are manufactured from carbon-fiber-reinforced silicon carbide, processed at over 1700°C. This material can withstand operating temperatures far beyond what iron rotors can handle, making brake fade virtually impossible during standard track sessions.
3. Sharper Handling
Our carbon-ceramic discs are over 45% lighter than equivalent iron discs. On a 911, removing this unsprung mass from the front corners has a profound effect. The nose turns in faster, the steering feels lighter and more communicative, and the suspension settles quicker over curbing.
4. Extraordinary Value & Longevity
This system offers elite, hypercar-level braking performance for a fraction of the cost of a factory PCCB retrofit. Furthermore, the rotors are designed to outlast iron discs by 3-4 times, making them a smart long-term investment for high-mileage drivers.
Installation Gallery
In-Depth Porsche 911 FAQ
Q: Why upgrade from the factory 6-piston to an Akebono 10-piston caliper?
The Akebono 10-piston caliper provides a significantly larger pad surface area. This spreads the heat and clamping force over a wider section of the rotor, reducing hot spots and improving pedal modulation. It is the same caliper architecture used on the Porsche Cayenne Turbo S and Panamera Turbo S PCCB systems, proven to handle immense loads.
Q: Is the handling difference from the weight savings really noticeable on a 911?
Absolutely. The 911's steering is renowned for its precision. Reducing unsprung mass at the front axle by 10kg+ makes that steering feel even more telepathic. The car changes direction with less effort, and the suspension can keep the tires planted more effectively over mid-corner bumps.
Q: Can I use this setup for daily driving?
Yes. Our StopFlex street/track pads are formulated to have good cold bite, meaning they are safe and effective for street use right out of the driveway. They also operate quietly and produce virtually no dust, making them excellent for daily duties.
Q: Will this fit under my 20-inch wheels?
Yes. The 410mm front and 400mm rear rotor combination is designed to fit within the barrel of standard Porsche 20-inch wheels (e.g., Carrera S, Turbo, or GT3 wheels). We always recommend verifying spoke clearance (X-factor) due to the width of the 10-piston caliper.
Q: What is the lifespan of these rotors?
For a 911 driven on the street with occasional track days, StopFlex rotors can easily last the lifetime of the vehicle ownership (250,000+ km). They do not wear down in thickness like iron rotors; instead, they are measured by weight to determine remaining life.
