The build: hardware and fitment
| Item | Specification |
|---|---|
| Vehicle | Porsche 911 (991.1 / 991.2) |
| Front setup | Brembo 10-piston caliper + 410mm STOPFLEX carbon ceramic rotor |
| Rear setup | Brembo 4-piston caliper + 400mm STOPFLEX carbon ceramic rotor |
| Pads | STOPFLEX low-dust ceramic compound |
| Weight saving | About 20 kg (44 lbs) off the car, total |
| Wheel requirement | 20-inch wheels minimum |
| Scope | Full front and rear custom big brake kit (replaces factory calipers) |
Read this first: this is a custom big brake kit, not an OE-style rotor swap. It replaces the factory 991 calipers with Brembo units, so you need 20-inch wheels minimum and a final clearance check against your exact wheel design. Want to keep your factory calipers? Then an OE-replacement carbon ceramic rotor is the path, not this BBK.
What the upgrade actually does
| STOPFLEX feature | Why it matters on a 991 | What you notice |
|---|---|---|
| Carbon ceramic rotors, about half the weight of steel | The 991 chassis already talks to you. Cutting unsprung and rotating mass at each corner keeps that feedback sharp instead of dulling it with heavy iron. | Lighter steering over rough pavement and a car that settles quicker after bumps. |
| Larger 410mm front / 400mm rear hardware | Bigger rotors and a 10-piston front caliper add pad area and a wider thermal window for repeated hard stops down a grade or on a spirited back road. | Firmer pedal that holds up when a stock setup would start to feel soft from heat. |
| Low-dust STOPFLEX pads | 911 wheels are open and on display. Iron dust bakes onto the barrels and never looks clean for long. | Wheels that stay clean between washes instead of turning gray by the weekend. |
| Rust-free ceramic rotors | A 911 sits between drives. Iron rotors film over with orange surface rust after one rainy night. | No rust bloom showing through the spokes after the car sits. |
| Long-fiber CCB construction | Street cars see cold mornings and short trips, not just track heat. Cold bite has to be normal on the first stop. | Normal braking cold, even around -20°C, and friction over 0.4μ at normal temps, about 0.3μ still holding at 900°C. |
What gets better
- Roughly 20 kg less unsprung and rotating mass across the car
- Cleaner wheels day to day, far less brake dust
- No orange rust film after the car sits in the rain
- More thermal headroom for repeated hard stops
- Bigger caliper and rotor fill behind the spokes for a GT-style look
- Long street life, roughly 250,000 to 300,000 km off track
What to confirm first
- You're running 20-inch wheels or larger
- Your exact wheel design clears the 410mm front caliper, aftermarket spokes especially
- You want a full BBK, not a factory-caliper rotor swap
- Your 911 is the 991.1 or 991.2 generation
- The car is mainly street-driven, not a dedicated track build
If you're not sure your car matches the spec shown here, send us your details and we'll confirm Porsche 911 (991) fitment before you order through our Porsche CCB collection.
Build gallery
Buyer questions
Why run a 10-piston front caliper on a 991 911?
This build swaps the factory front brakes for a larger Brembo fixed 10-piston caliper, which adds pad area and thermal capacity over the standard 991 setup. Owners who go this route want stronger repeated braking and a more serious look behind 20-inch wheels.
Does this CCB upgrade change the 911 991 brake balance?
No. The kit is matched front to rear, with 410mm front and 400mm rear STOPFLEX rotors and matched Brembo caliper sizing so both axles work together. A brake upgrade like this should always be built as a complete system, not mixed parts.
Is this STOPFLEX carbon ceramic setup okay for daily street driving?
Yes. It runs low-dust STOPFLEX pads, brakes normally when cold, and the rotors don't rust after rain. For a 911 that gets driven on the street, that means cleaner wheels and normal everyday behavior.
Will the 410mm front BBK clear 20-inch 991 wheels?
Twenty-inch wheels are the minimum for this 410mm front, 400mm rear kit. Final clearance still has to be checked against your exact wheel design, especially aftermarket wheels with different spoke geometry.
How long do STOPFLEX carbon ceramic rotors last on the street?
Driven on the street and kept off the track, STOPFLEX carbon ceramic rotors can reach roughly 250,000 to 300,000 km. Real lifespan depends on how you drive, your pad choice, and operating conditions.
