2017-2026+ Audi RS4 / S4 (B9) Carbon Ceramic Brake Kit
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
2017-2026+ Audi RS4 / S4 (B9) Carbon Ceramic Brake Kit — OEM-Size Replacement
The B9 Audi S4 and RS4 owners shopping carbon ceramic brakes are usually trying to reduce iron-rotor heat fade, dust, and front-end mass without changing the factory brake package. This StopFlex OEM-size replacement kit is built around the listed B9 fitments: S4 350mm front / 330mm rear, RS4 375mm front / 330mm rear, or RS4 400mm front carbon-ceramic configuration. The kit includes carbon-ceramic rotors, matching pads, hats, and floating hardware so the correct caliper and rotor diameter can be retained instead of converting the car to an unrelated big-brake layout.
- S4 B9 fitment is for the OEM 350mm front rotor and 330mm rear rotor package only; it is not a 375mm or 400mm RS4 conversion kit.
- RS4 B9 fitment is limited to the listed 375mm front iron-replacement setup or the 400mm front carbon-ceramic setup, with 330mm rear rotors as specified for this page.
- Carbon-ceramic rotors cut brake dust and rotating mass compared with the factory iron S4/RS4 rotor package while adding thermal margin for repeated high-speed stops.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Audi RS4 / S4 (B9) |
| Model years | 2017-2026+ |
| Front rotor reference | RS4: 375mm, 400mm (CCB); S4: 350mm |
| Rear rotor reference | RS4: 330mm; S4: 330mm |
| Page type | OEM-size carbon ceramic replacement |
| Minimum wheel size | 19" (for the 375 mm rotor) |
For OEM replacement orders, StopFlex builds around the factory rotor specification shown for this vehicle. Front floating-caliper setups require manual review before production. If the car uses aftermarket calipers such as Brembo, AP Racing, Alcon, or Wilwood, the order can still be built, but the exact caliper model, pad shape, and rotor dimensions must be confirmed before production.
This setup uses a 375 mm rotor, so the minimum wheel size is 19". Wheels under 19" will not clear the caliper and rotor, and spoke profile and offset affect clearance too — confirm your exact wheels before ordering.
Why StopFlex CCB
Lower Unsprung Mass
StopFlex carbon-ceramic rotors are engineered to reduce rotor mass versus comparable iron discs, helping the suspension react cleaner and the steering feel more precise.
High-Temperature Stability
The carbon-silicon-carbide matrix is built for stable braking behavior at temperatures that can push iron rotors into heavy fade.
Rust-Free Rotor Surface
Carbon ceramic does not form orange flash rust after rain, washing, or storage, keeping the visible rotor face cleaner behind open wheels.
Long Street-Service Potential
In normal road use with matched pads and proper bedding, StopFlex CCB rotors are designed for far longer service life than typical iron replacement rotors.
Low Visible Dust
When paired with matched StopFlex pads, the system produces very low visible brake dust compared with conventional iron rotor and pad combinations.
Premium Ceramic-Glaze Appearance
StopFlex's proprietary coating creates a bright, high-end ceramic-glaze finish with subtle glaze texture and a more premium visual character behind open wheels.
Street-Usable Cold Bite
Street Spec and Track-Day Spec rotors are designed for normal first-stop road use, including cold-weather operation. Motorsport Spec is the competition-focused exception.
Continuous Fiber Reinforcement
Long-fiber carbon ceramic construction improves structural strength and thermal durability versus chopped-fiber approaches.
Custom Rotor Hat Color
Every StopFlex OEM replacement order can be built with a custom rotor hat color, giving the carbon ceramic rotor package a cleaner match with the wheel, body color, and overall build style.
Heat Management Note
Carbon ceramic rotors tolerate extreme surface temperature, but they do not remove every heat-management requirement. During repeated hard stops, heat can still soak 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.
Street / Track-Day / Motorsport Rotor Options
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.
Package Scope
| Item | Details |
|---|---|
| CCB rotors | Full-car set by default |
| CCB brake pads | Matched for StopFlex carbon ceramic rotors |
| 7075 aluminum floating rotor hats | Vehicle-specific fitment |
| Stainless floating hardware | Full-car hardware set |
| Rotor hat color | Custom rotor hat colors are available for every OEM replacement order. |
| Order scope | Default listing is full-car set. Front-only or rear-only orders can be arranged after confirmation. |
FAQ
Will this kit fit every 2017-2026+ B9 S4 or RS4?
No. Fitment is limited to the exact trim and rotor size ordered: S4 with 350mm front and 330mm rear rotors, RS4 with 375mm front and 330mm rear rotors, or RS4 with the 400mm front carbon-ceramic setup. Confirm your current rotor diameter, caliper package, and wheel clearance before ordering.
Does the rear electronic parking brake still work?
Yes, the kit is designed as an OEM-size replacement for the listed B9 rear 330mm setup, so the factory rear caliper and electronic parking brake function are retained when the correct rear rotor and pad specification is selected.
Why switch a B9 S4 or RS4 from iron rotors to carbon ceramic?
The main gains are lower brake dust, reduced rotating and unsprung mass, and better resistance to heat buildup during repeated hard stops. This matters on the B9 S4 350mm front package and RS4 375mm front package because both use large iron discs that add weight at the hub and generate visible dust on open-wheel cars.
Is this for street use, track use, or replacing worn OEM carbon ceramics?
It can serve all three use cases when the correct pad compound and rotor size are selected. S4 and RS4 owners replacing iron rotors usually want lower dust and better heat stability; RS4 owners with 400mm OEM carbon ceramics often want a direct-size replacement instead of dealer-priced rotor service.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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.
Get in Touch
Business Hours
Monday – Saturday, 9:30 AM – 6:30 PM (GMT +8)
Current Time:
Follow Us
- Choosing a selection results in a full page refresh.