2018-2019 Porsche 911 (991) GT2 RS Carbon Ceramic Big Brake Kit — Brembo Porsche 911 GT3 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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Will This Fit My Car?
Full Upgrade CCB Big Brake Kits (With Calipers) for the 2018-2019 Porsche 911 (991) GT2 RS. This page's exact brake setup:
| Model Years | Front Setup | Rear Setup | Min. Wheel Size |
|---|---|---|---|
| 2018-2019 | Brembo OEM Porsche 911 GT3 6-Piston Caliper / 410mm | Brembo OEM Porsche 911 GT3 4-Piston Caliper / 390mm | 21" |
This kit is built per car, not per platform. We engineer the brackets, rotor-hat offsets, and caliper mounting to your confirmed model and trim, because trims sharing a chassis name frequently differ underneath — performance variants can run different knuckles, hub geometry, and wheel ET clearance than their standard siblings. You receive calipers, pads, rotor hats, floating hardware, and brake lines as one matched, trim-specific system. Cars with modified knuckles, uprights, or non-factory suspension mounting points need review 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 |
| CCB brake pads | Matched ceramic-compatible compound for the supplied StopFlex carbon ceramic rotors |
| Brake pad wear sensors | Included; 100% compatible with the OEM wear-sensor system. |
| 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
Specify custom caliper colors, a custom caliper logo, and custom rotor hat colors on any kit order — the finished package matches your build instead of a standard catalog look.
- Custom caliper color
- Custom caliper logo
- Custom rotor hat color
Why Carbon Ceramic — and Why StopFlex
Long Street-Service Life
In normal road use with matched pads and correct bedding, one StopFlex CCB rotor set is engineered to outlast several sets of iron replacement rotors, recovering part of the up-front cost.
Low Visible Dust
Matched with StopFlex pads, the system sheds a fraction of the dust an iron rotor and pad combination throws. Wheels stay clean for weeks of driving instead of days.
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.
Continuous Fiber Construction
StopFlex discs are built with long continuous carbon fiber instead of chopped short fiber. Continuous strands carry load across the whole rotor body, raising strength and thermal durability under heat cycles.
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 carbon-ceramic rotor weighs roughly half of the equivalent iron disc. Less rotating, unsprung mass lets the suspension follow broken pavement more cleanly and makes steering response noticeably sharper.
High-Temperature Stability
The carbon-silicon-carbide friction matrix keeps working at temperatures that push iron rotors into heavy fade, so the tenth hard stop feels like the first — same pedal travel, same bite point.
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.
Winter & Cold-Weather Braking
A cold, untuned carbon-ceramic disc needs more pedal than iron on the first winter stops — normal material physics. StopFlex engineered the pad formula and disc coating specifically for cold starts, closing that gap: cold-car winter feel is now very close to summer feel. Keep a little extra distance on the coldest mornings; for harsh winters, choose Street Spec.
Caliper Overview
Front Caliper
The front caliper is the Brembo OEM Porsche 911 GT3 6-piston unit, matched to the 410mm carbon-ceramic front rotor. Six opposed pistons give even pad loading and a firm, repeatable pedal on the GT2 RS under hard, sustained braking.
Rear Caliper
The rear runs the Brembo OEM Porsche 911 GT3 4-piston caliper over a 390mm rotor, adding rear thermal capacity to balance the front on track. Rear bias and hardware are set for your confirmed GT2 RS spec.
Choose Your Rotor: Street, Track-Day, or Motorsport

Street Spec
Ceramic coating, cross-drilled face, and large cooling channels.
Best for daily driving and premium street builds that need clean cold bite, low dust, corrosion-free appearance, and long service life.

Track-Day Spec
Ceramic coating, blank face, and honeycomb cooling channels.
Best for fast-road and track-day use where repeated braking stability matters more than maximum visual drilling style.

Motorsport Spec
Uncoated blank face with honeycomb cooling channels.
Best for race-focused builds that run competition pads, high-temperature fluid, cooling strategy, and a proper warm-up window. Not the default street choice.
Heat Management Note
Carbon ceramic rotors tolerate extreme surface temperature, but they do not remove every heat-management requirement. During repeated hard stops, heat still soaks into pads, fluid, seals, calipers, wheels, and nearby components. For long track sessions, mountain descents, or sustained aggressive driving, brake cooling and high-temperature fluid are still recommended.
Get Your Fitment Confirmed
Before ordering, tell us the exact vehicle, current rotor sizes, and caliper type. Nothing goes to production until the build is confirmed against your VIN-level configuration.
FAQ
How does this kit behave in winter or on a cold first stop?
Any carbon-ceramic disc bites less than cold iron on the first stops of a cold morning — that is normal physics, not a fault. We tune both the pad compound and the disc ceramic coating for cold starts, so cold-car feel on this GT2 RS comes very close to summer feel. Leave a little extra following distance on the first one or two stops until temperature comes up.
Will this fit my exact GT2 RS, or is it a general 991 kit?
Each kit is bespoke-engineered for the confirmed 2018-2019 GT2 RS. The GT2 RS uses front uprights, hub geometry, and wheel clearance that differ from lesser 991 trims, so we cut brackets and set rotor-hat offsets specifically for this car. We do not treat it as a platform-wide bolt-on.
What wheels do I need to clear the 410mm front rotor?
The 410mm front rotor requires a minimum 21-inch wheel; anything smaller will not clear it. Spoke clearance matters too, so send us your wheel details and we confirm fit before building the kit.
Will the factory pad-wear warning still work?
Yes. The kit includes pad wear sensors that are fully compatible with the Porsche OEM wear-sensor system, so your dash pad-wear warning keeps working with no error messages. The electronic parking brake in the rear calipers is also retained.
More Contact Information
We’re here to help! Whether you need expert advice on brake setups, have questions about your order, or just want to share feedback, our team is ready to assist you. Reach out via your preferred channel below, or use the inquiry form.
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