2017-2026+ Audi RS4 / S4 (B9) Carbon Ceramic Brake Rotors
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?
Direct Replacement CCB Discs (Retain Factory Calipers) for the 2017-2026+ Audi RS4 / S4 (B9). Factory rotor specifications and the smallest wheel that clears each trim:
| Trim | Front Rotor (Factory) | Rear Rotor (Factory) | Min. Wheel Size |
|---|---|---|---|
| RS4 | 375mm, 400mm (CCB) | 330mm | 20" |
| S4 | 350mm | 330mm | 18" |
Keep Your Factory Calipers?
Keep them if the front calipers are fixed 4-piston or more — the rear axle qualifies regardless. Front 1- or 2-piston floating calipers rule out the disc-only route; choose the Full Upgrade kit instead. Every set is machined to the factory rotor specs listed above, and aftermarket calipers (Brembo, AP Racing, Alcon, Wilwood) only need the caliper model, pad shape, and rotor dimensions confirmed before we build.
Spoke profile and offset also affect clearance — confirm your exact wheels before ordering.
What's in the Box
| Item | Details |
|---|---|
| Product type | Direct Replacement CCB Discs (Retain Factory Calipers) |
| CCB rotors | Full-car set by default, built to the factory rotor specification |
| CCB brake pads | Matched ceramic-compatible compound for StopFlex carbon ceramic rotors |
| 7075 aluminum floating rotor hats | Vehicle-specific fitment; custom rotor hat colors available for every Direct Replacement order. |
| Stainless floating hardware | Full-car hardware set |
| Order scope | Default listing is full-car set. Front-only or rear-only orders can be arranged after confirmation. |
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.
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.
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.
Winter & Cold-Weather Braking
Winter question, straight answer: untuned ceramic discs bite less when cold. StopFlex optimized the pad compound and the rotor's ceramic coating for cold operation, so cold-start braking in winter feels very close to warm-weather braking. Extra following distance on freezing first stops is still smart; severe-winter daily cars should run Street 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
Share your year, model, trim, wheel size, current rotor dimensions, and caliper type — every order is verified against your VIN-level configuration before it goes to production.
FAQ
Will this fit my exact B9 S4 or RS4?
This page covers the 2017-2026+ B9 S4 and RS4 only, and fitment is tied to your exact factory rotor size. RS4 fronts are either 375mm or 400mm (the 400mm is the factory CCB size); S4 fronts are 350mm. Both trims run 330mm at the rear. Because this is a direct-replacement disc that reuses your factory calipers, the front calipers must be 4-piston or more — that covers the RS4 and the correctly-equipped S4 front setups. Confirm your rotor size and front caliper before ordering so we match hats, pads, and floating hardware to your car.
How do these behave in winter and cold-morning driving?
Physics first: an untuned cold carbon-ceramic disc bites a little less than cold iron on the very first stops. That's normal, not a defect. We addressed it two ways on this kit — the low-metallic resin-composite pad compound and the disc's ceramic coating are both tuned for cold starts, so first-stop feel on a cold B9 now comes very close to warm summer feel. Still, leave a little extra following distance on your first few stops on the coldest mornings until everything is up to temperature.
Is this a real replacement for the factory Audi Sport CCB rotors?
Yes. If your RS4 already runs the 400mm factory carbon-ceramic front discs, this kit replaces those worn rotors at a fraction of dealer replacement cost while keeping your factory calipers and 330mm rear setup. If your S4 or RS4 runs iron rotors (350mm or 375mm front), this converts you to carbon-ceramic without changing calipers. Either way you keep the OEM caliper mounting and clamping, so pedal feel and ABS behavior stay predictable.
What do the pads and rotors handle on a hard drive?
The included pads are a carbon-ceramic-specific low-metallic resin-composite with steel, copper, and aramid fiber, averaging about a 0.44 coefficient of friction and holding up to roughly 750°C with strong anti-fade behavior. On the B9's turbo V6, that matters on repeated hard stops down a mountain road, where stock iron rotors fade. The carbon-ceramic discs also shed heat faster and cut unsprung weight versus iron, and produce far less brake dust on your wheels.
More Contact Information
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