Porsche 911 (991) Speedster Brembo OEM Porsche 911 GT3 6-Piston Caliper with 410mm CCB carbon ceramic brake rotor
Brembo OEM Porsche 911 GT3 6-Piston Caliper 410mm CCB carbon ceramic front brake kit for Porsche 911 (991) Speedster
Porsche 911 (991) Speedster Brembo OEM Porsche 911 GT3 4-Piston Caliper with 390mm CCB carbon ceramic rear brake rotor
Brembo OEM Porsche 911 GT3 4-Piston Caliper 390mm CCB carbon ceramic rear brake kit for Porsche 911 (991) Speedster

2019 Porsche 911 (991) Speedster Carbon Ceramic Big Brake Kit — Brembo Porsche 911 GT3 6-Piston

Request a Custom Quote

To ensure 100% fitment accuracy, our brake kits are custom-configured for your specific vehicle. Please share your Year / Make / Model / Wheel Size / VIN with our specialists for a bespoke setup and pricing.

Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.

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About the Disc

Will This Fit My Car?

Full Upgrade CCB Big Brake Kits (With Calipers) for the 2019 Porsche 911 (991) Speedster. This page's exact brake setup:

Model Years Front Setup Rear Setup Min. Wheel Size
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
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

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

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.

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.

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

Front is the Brembo OEM Porsche 911 GT3 6-Piston Caliper, the same monobloc unit engineered for the GT3's braking loads. Six pistons spread clamping force evenly across the 410mm rotor, so pedal feel stays firm and predictable through repeated hard stops.

Rear Caliper

Rear uses the Brembo OEM Porsche 911 GT3 4-Piston Caliper on a 390mm rotor, adding rear thermal capacity to match the front and keep brake balance stable under heavy track use.

Choose Your Rotor: Street, Track-Day, or Motorsport

StopFlex Street Spec carbon ceramic brake rotor

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.

StopFlex Track-Day Spec carbon ceramic brake rotor

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.

StopFlex Motorsport Spec carbon ceramic brake rotor

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

High rotor temperature tolerance does not mean heat management disappears. Under repeated hard braking, heat migrates into the pads, brake fluid, seals, calipers, and wheels even when the ceramic disc itself is comfortable. Plan brake cooling and high-temperature fluid for extended track sessions, long mountain descents, or sustained aggressive driving.

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

Will this kit fit my exact 2019 991 Speedster?

Yes, but only after we confirm your trim. The Speedster shares its chassis name with other 991 cars, yet front knuckles, hub geometry, and wheel ET clearance can differ between variants. We build the brackets, rotor-hat offsets, and caliper mounting to your specific Speedster, so this is bespoke per confirmed trim, not a platform-wide bolt-on assumption.

What wheels do I need to clear the 410mm front rotors?

The 410mm front rotor requires a minimum 21-inch wheel. Anything under 21 inches will not clear the caliper and disc, and spoke clearance matters too. Send us your wheel details during fitment confirmation and we'll verify clearance before anything ships.

How do carbon ceramic brakes behave in cold winter weather?

An untuned cold carbon-ceramic disc bites less than cold iron on the first stops. That's normal physics, not a defect. We've optimized both the pad compound and the disc's ceramic coating for cold starts, so cold-car winter feel now comes very close to summer feel. On the coldest first stops, still leave a little extra following distance until the system is up to temperature.

Will my dashboard pad-wear warning still work?

Yes. This kit includes brake pad wear sensors that are fully compatible with your Porsche's OEM wear-sensor system. The factory pad-wear warning keeps working normally with no dashboard errors. The rear electromechanical parking brake is also retained.

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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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