2015-2019 Porsche 911 (991) Carrera GTS Carbon Ceramic Big Brake Kit — Porsche GT3 6-Piston
Official Warranty: We offer a 1-year free replacement for quality defects or coating issues under normal (non-track) use. Please note that provided specs apply strictly to brake hats and brackets; wheel fitment data is for general reference only. Wheel clearance issues are excluded from warranty coverage and data accuracy claims. If additional clearance is needed, wheel spacers must be added at the customer's discretion.
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Will This Fit My Car?
Full Upgrade CCB Big Brake Kits (With Calipers) for the 2015-2019 Porsche 911 (991) Carrera GTS. This page's exact brake setup:
| Model Years | Front Setup | Rear Setup | Min. Wheel Size |
|---|---|---|---|
| 2015-2019 | Brembo OEM Porsche 911 GT3 6-Piston Caliper / 410mm | Brembo OEM Porsche 911 GT3 4-Piston Caliper / 390mm | 21" |
Every StopFlex kit is bespoke-engineered for your exact model and trim — brackets, rotor-hat offsets, and caliper mounting are matched to your specific car, never assumed from the platform. Trims that share a chassis name can differ mechanically: a pure performance variant often carries different knuckles, hub geometry, and wheel ET clearance than the standard models, so parts that bolt onto one are not the parts that fit the other. Calipers, pads, rotor hats, floating hardware, and brake lines ship as one matched system built to your confirmed trim. Modified knuckles, uprights, or non-factory suspension mounting points must be reviewed before ordering.
The 410 mm rotor sets the minimum wheel size at 21" — smaller wheels will not clear the caliper and rotor. Spoke profile and offset also affect clearance; confirm your exact wheels before ordering.
| Wheel Size (Standard) | Disc Range |
|---|---|
| 15" | 260 mm – 285 mm |
| 16" | 285 mm – 300 mm |
| 17" | 300 mm – 330 mm |
| 18" | 330 mm – 355 mm |
| 19" | 355 mm – 380 mm |
| 20" | 380 mm – 400 mm |
| 21" | 400 mm – 420 mm |
| 22" | 420 mm – 440 mm |
What's in the Box
| Item | Details |
|---|---|
| Product type | Full Upgrade CCB Big Brake Kits (With Calipers) |
| Front calipers | Brembo OEM Porsche 911 GT3 6-Piston Caliper OE / Part No.: L 9GT-615-123A · R 9GT-615-124A |
| Front CCB rotors | 410mm |
| Rear calipers | Brembo OEM Porsche 911 GT3 4-Piston Caliper OE / Part No.: L 9GT-615-423A · R 9GT-615-424A |
| Rear CCB rotors | 390mm |
| Rotor construction | Short-Fiber Street Spec (lower price, street-only) or Long-Fiber Street / Track-Day / Motorsport Spec — chosen at order confirmation |
| CCB brake pads | Matched ceramic-compatible compound for the supplied StopFlex carbon ceramic rotors |
| Brake pad wear sensors | Included; specified for compatibility with the factory wear-sensor system, subject to final vehicle confirmation. |
| Rotor hats and floating hardware | Vehicle-specific hardware package |
| Brake lines | Included for complete kit-upgrade orders |
| Order scope | Default listing is full-car set when front and rear are specified. Front-only or rear-only orders can be arranged after confirmation. |
Make It Yours — Color & Logo Customization
Any kit order can be personalized: custom caliper colors, a custom caliper logo, and custom rotor hat colors, so the hardware behind your wheels matches the rest of the build.
- Custom caliper color
- Custom caliper logo
- Custom rotor hat color
Why Carbon Ceramic — and Why StopFlex
Premium Ceramic-Glaze Finish
StopFlex's proprietary coating gives the disc a bright ceramic-glaze surface with subtle texture — the factory carbon-ceramic look, clearly visible through open wheel designs.
Short-Fiber or Long-Fiber — Your Call
Every StopFlex disc is true carbon-ceramic. Short-Fiber Street Spec uses a simpler chopped-fiber process for a lower price and street-only duty; the Long-Fiber line uses continuous carbon strands that carry load across the whole rotor for higher strength and thermal durability — the pick for track and race heat.
Bespoke Per-Vehicle Engineering
Every order is machined to the confirmed vehicle and trim. Brackets, hat offsets, and pad shapes are built for that exact car — never pulled from a one-size-fits-all catalog.
CCB-Specific Pad Compound
A low-metallic resin pad compound reinforced with steel, copper, and aramid fiber, made for ceramic discs: stable to about 750 °C, roughly 0.44 average friction, strong fade resistance, low rotor wear.
Lower Unsprung Mass
A like-size carbon-ceramic rotor can be materially lighter than an iron disc; the exact saving depends on rotor dimensions. Lower rotating, unsprung mass can reduce the load the suspension has to control.
High-Temperature Stability
The carbon-silicon-carbide friction material is selected for high-temperature stability and fade resistance. Overall pedal feel still depends on pad condition, fluid, caliper stiffness, cooling and operating temperature.
Rust-Free Rotor Surface
Ceramic discs cannot flash-rust. After rain, a wash, or weeks of parking, the rotor face behind your open-spoke wheels stays clean — no orange ring on a freshly detailed car.
Long Street-Service Life
In normal road use with matched pads and correct bedding, carbon-ceramic friction surfaces are designed for low wear. Actual service life depends on mileage, contamination, pad choice, heat cycles and driving use.
Low Visible Dust
Matched StopFlex pads are selected for low visible dust on the ceramic friction surface. Actual wheel dust still varies with pad choice, traffic, temperature, bedding and driving intensity.
Winter & Cold-Weather Braking
Cold-weather trade-off: an untuned carbon-ceramic disc can have less initial bite than cold iron. StopFlex specifies a matched pad compound and ceramic coating tuned to reduce that cold-start gap, but the coldest first stops still deserve extra following distance. Severe-winter daily drivers should choose a Street Spec.
Caliper Overview
Front Caliper
Front uses the Brembo OEM Porsche 911 GT3 6-Piston Caliper with the supplied 410mm rotor. This is a full upgrade configuration, not a factory-caliper retention option.
Rear Caliper
Rear uses the Brembo OEM Porsche 911 GT3 4-Piston Caliper with the supplied 390mm rotor. The kit covers both axles and includes wear sensors specified as compatible with the OEM wear-sensor system.
Choose Your Rotor: Short-Fiber Street to Long-Fiber Motorsport
Left to right is ascending duty. Short-Fiber Street Spec keeps carbon-ceramic benefits at a lower price for street use only; the Long-Fiber Street, Track-Day, and Motorsport specs add continuous-fiber strength and thermal durability for everything from daily premium builds to race weekends.
Short-Fiber Street Spec
Chopped short-fiber carbon-ceramic body, ceramic coating, cross-drilled face.
Choose this for street-only use when purchase price matters most. It keeps the carbon-ceramic friction surface and coated finish, but it is not specified for track sessions.
Long-Fiber Street Spec
Continuous long-fiber body, ceramic coating, cross-drilled face, large cooling channels.
Choose this for daily and fast-road use when you want the long-fiber construction without moving to a track-focused face and cooling specification.
Long-Fiber Track-Day Spec
Continuous long-fiber body, ceramic coating, blank face, honeycomb cooling channels.
Choose this for repeated fast-road or track-day braking where thermal duty matters more than the drilled street appearance. High-temperature fluid and appropriate cooling still matter.
Long-Fiber Motorsport Spec
Continuous long-fiber body, uncoated blank face, honeycomb cooling channels.
Choose this for competition-focused use with the corresponding pad, fluid, cooling and warm-up strategy. It is not the default recommendation for a street-driven car.
Heat Management Note
Ceramic discs shrug off surface temperatures that would destroy iron, but the rest of the system still heats up: pads, fluid, seals, calipers, and wheels all absorb soak heat during repeated hard stops. For track days, long descents, and sustained hard driving, run brake cooling and high-temperature fluid.
Get Your Fitment Confirmed
Send the exact year, model, trim, current rotor sizes, caliper type, and wheel details before ordering. StopFlex confirms the supplied configuration before production and requests VIN/build data when needed.
FAQ
Does this kit fit every 2015-2019 Porsche 911 (991) Carrera GTS?
This listing is for the 2015-2019 Porsche 911 (991) Carrera GTS only, with a 410mm front and 390mm rear configuration. Final fitment is bespoke to the confirmed exact model and trim. Brackets, hat offsets, and caliper mounting are not assumed to transfer between trims simply because they share the 991 platform.
What wheel clearance does the 410mm front setup require?
The 410mm front rotor configuration requires a minimum 21-inch wheel under this listing. Diameter alone is not enough: wheel spoke profile and offset still need physical clearance confirmation around the Brembo OEM Porsche 911 GT3 6-Piston Caliper before the order is released.
Which carbon-ceramic rotor specification suits my Carrera GTS use?
Choose Short-Fiber Street Spec for the lower-cost street-only option. Long-Fiber Street, Track-Day, and Motorsport use long-fiber construction for progressively higher heat and duty requirements. Select the rotor spec around how the car is actually used, then confirm the exact configuration before production.
What should I expect from carbon-ceramic brakes in winter or on the first cold stops?
An untuned cold carbon-ceramic disc can have less initial bite than cold iron. StopFlex specifies a matched pad compound and disc coating to reduce that cold-start gap, but the coldest first stops still deserve extra margin. Do not expect identical warm-weather response immediately after a cold start.
More Contact Information
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