The build: calipers, rotors, fitment
| Component | Front axle | Rear axle |
|---|---|---|
| Vehicle | Porsche 911 (992) | |
| Caliper | Brembo BM6, 6-piston forged | Brembo BM4, 4-piston forged |
| Rotor diameter | 405 mm | 380 mm |
| Rotor type | STOPFLEX long-fiber carbon ceramic | STOPFLEX long-fiber carbon ceramic |
| Pads | STOPFLEX high-performance ceramic | STOPFLEX high-performance ceramic |
| Wheel fitted | 20-inch factory | 21-inch factory |
| Axle scope | Front and rear conversion | |
Fitment check first: these are 405mm front and 380mm rear rotors sized for the factory 992 staggered 20-inch front / 21-inch rear wheels. Aftermarket or non-standard wheels change clearance, so confirm your exact wheel and trim before you order.
Why this setup works on a 992
| STOPFLEX feature | Why it matters on a 992 | What you notice |
|---|---|---|
| Long-fiber carbon ceramic rotor | The 992 carries weight over the rear and builds real heat under repeated hard stops; iron rotors fade once they soak. Continuous long-fiber construction holds up to that heat better than chopped-fiber discs. | The pedal stays consistent on a long mountain descent or back-to-back track laps instead of going soft. |
| Roughly half the weight of iron | Every pound at the rotor is unsprung and rotating mass. On a car this sensitive to inputs, cutting it changes how the front end reacts. | Steering feels a touch quicker and the suspension settles faster over broken pavement. |
| Friction near 0.3μ at 900°C | Sustained heat is exactly where a factory iron setup loses bite. Holding friction at high temperature is the whole point of going ceramic. | Braking force you can count on lap after lap, not just on the first few stops. |
| Brembo BM forged calipers | Matching the factory piston count misses the point; the forged BM body resists flex under high line pressure where a softer caliper deflects. | A firmer, more communicative pedal that tells you what the tires are doing. |
| No rust, low dust, long life | A 992 spends most of its life on the street, where iron rotors rust on the surface and coat the wheels in dust. | Clean wheel faces between washes and a rotor that looks right even after the car sits in the rain. |
What gets better
- Firmer, more consistent pedal from cold launch through repeated hard stops
- Friction holding near 0.3μ at 900°C, so heat doesn't kill your braking
- Roughly half the rotor weight of iron, off the unsprung mass at each corner
- Cold first stop stays normal even around -20°C
- Low brake dust with STOPFLEX pads, so the wheels stay clean
- Rotors that don't rust after rain and can run 250,000–300,000 km on the street
What to confirm first
- Your wheel size and offset — the kit is sized for factory 20-inch front / 21-inch rear
- Exact 992 trim and model year, so the bracket and rotor match your hubs
- Front and rear conversion as shown here, not a single-axle swap
- Pads: run the matched STOPFLEX ceramic pads with these rotors
- Intended use — daily and spirited road, occasional track — so we spec it right
If you're not sure your car matches the spec shown here, send us your wheel size, trim, and model year and we'll confirm Porsche 911 (992) fitment before you order through our Porsche CCB collection.
Build Gallery
FAQ
Why upgrade the 992 brakes when the factory car already runs a 6-piston front caliper?
The factory cast-iron setup is strong for street and spirited road use, but repeated hard stops on track or down a long grade build heat the iron can't shed fast enough, and the pedal goes long. Brembo BM forged calipers add rigidity for a firmer pedal, and STOPFLEX carbon ceramic rotors hold their friction as temperature climbs, so braking stays consistent instead of fading.
What wheels do I need to run the 405mm front STOPFLEX kit on a 992?
This build uses 405mm front and 380mm rear STOPFLEX carbon ceramic rotors sized to clear the factory Porsche 911 (992) staggered setup of 20-inch front and 21-inch rear wheels. Send us your exact wheel and trim before ordering so we can confirm clearance.
How much weight does the carbon ceramic upgrade actually save?
STOPFLEX carbon ceramic rotors weigh roughly half what a same-size cast-iron rotor weighs. That comes straight off unsprung and rotating mass at each corner, which sharpens steering response and helps the suspension settle faster over rough pavement.
Will the rotors rust if the 992 sits outside in the rain?
No. STOPFLEX carbon ceramic rotors don't rust after rain or humidity, so the rotor face stays clean behind the wheel even if the car sits for a while between drives.
How long do these rotors last on a street-driven 992?
Used mainly on the street rather than constant track sessions, STOPFLEX long-fiber carbon ceramic rotors can reach roughly 250,000 to 300,000 km of service life, well beyond what cast-iron rotors typically deliver.
