The Build: Parts and Fitment
| Item | What's fitted |
|---|---|
| Vehicle | Porsche 718 GTS (982), mid-engine |
| Front setup | OEM 991 GT3 6-piston caliper with 410mm STOPFLEX carbon ceramic rotor |
| Rear setup | Factory 4-piston caliper with 390mm STOPFLEX carbon ceramic rotor |
| Pads | STOPFLEX street/track ceramic compound |
| Master cylinder | Factory 718 unit retained |
| Wheel fitment | Sized for 20-inch wheels; final clearance confirmed by wheel design |
| Weight saved | About 20 kg (44 lb) total |
Read this before you order
This is a custom big brake conversion built around 991 GT3 6-piston front calipers, not a bolt-on kit. It needs the correct adapter hardware, and the 410mm front rotor wants a 20-inch wheel — most 19s won't clear it. Confirm your exact wheel design, not just the diameter, before buying.
What the Upgrade Actually Does
| STOPFLEX feature | Why it matters on a 718 GTS | What you notice |
|---|---|---|
| 991 GT3 6-piston front caliper | The stock 4-piston front limits pad shape and heat capacity once you push the GTS chassis. The bigger caliper takes a larger pad with more compound choices. | Firmer pedal, finer modulation, and brakes that don't go soft on a back-to-back run down a grade or a track lap. |
| 410mm front / 390mm rear CCB rotors | More rotor face means more thermal mass to soak up repeated hard stops without fade. | Consistent bite from the first stop to the tenth, instead of a pedal that wanders as the brakes heat up. |
| Carbon ceramic construction | These rotors run about half the weight of same-size steel discs, and that's all unsprung, rotating mass on a car built around feedback. | Quicker turn-in and a chassis that settles faster over rough pavement and quick direction changes. |
| High heat tolerance | STOPFLEX rotors still hold meaningful friction at sustained 900°C surface temps, around 0.3μ. | The brakes stay predictable on a hot mountain road or a long track session, not just on the first cold stop. |
| STOPFLEX pads + ceramic rotors | The factory steel discs rust after a wash and throw dust that cakes the wheels; the GTS owner usually cares how the car looks. | Very low brake dust, rotors that don't surface-rust after rain, and a crackle-texture face that looks the part behind the spokes. |
What gets better
- More heat headroom for track days and fast mountain roads
- Sharper pedal feel and modulation from the stiffer 6-piston front
- About 20 kg less unsprung, rotating mass for quicker turn-in
- Very low brake dust and rotors that won't rust after rain
- OEM+ look with a premium ceramic rotor face behind 20-inch wheels
What to confirm first
- Your exact 20-inch wheel design clears the 410mm front rotor and 6-piston caliper
- The car suits the GT3 front caliper conversion and adapter hardware
- Your street/track mix, so we match the right pad compound
- If you only drive casually, the wins are feel, cleanliness, and weight more than raw stopping distance
If you're not sure your car matches the spec shown here, send us your wheel and chassis details and we'll confirm Porsche 718 GTS (982) fitment before you order through our Porsche CCB collection.
Build Gallery
718 GTS Brake Upgrade FAQ
Why put 991 GT3 calipers on a 718 GTS instead of keeping the stock 4-piston brakes?
The factory 718 4-piston front caliper is fine for street driving, but it limits pad shape and heat capacity once you start running hard. The 6-piston 991 GT3 front caliper takes a larger pad with more compound choices, and its stiffer body sharpens pedal feel and modulation under repeated heavy braking.
Is a carbon ceramic setup overkill for a street-driven 718 GTS?
Not really. Even if you never see a track, the lighter rotors cut unsprung mass, sharpen turn-in, and keep your wheels clean when paired with STOPFLEX pads. The payoff is a lower-maintenance, better-feeling brake package, not just bigger numbers on a stopping-distance chart.
Will the 410mm front kit clear factory 20-inch wheels?
This 410mm front and 390mm rear setup is sized for 20-inch wheel clearance. Most 19-inch wheels will not clear the larger front rotor and 6-piston caliper. Always confirm against your exact wheel design before ordering, since spoke shape matters as much as diameter.
Do you have to change the master cylinder for this brake upgrade?
No. The factory 718 master cylinder supplies enough fluid volume to run the 6-piston front calipers with a firm, linear pedal, so it stays in place for this build.
How long do STOPFLEX carbon ceramic rotors last on a 718 GTS?
On the street they last a long time, with this application cited at over 200,000 km of road use. Real-world life depends on your driving style, pad choice, and whether the car sees regular track time.
