2005-2008 Audi A4 / S4 / RS4 (B7) CCB Big Brake Kit | Akebono 9N 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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2005-2008 Audi A4 / S4 / RS4 (B7) CCB Big Brake Kit — Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper Front + TTSPORT EP4 4-Piston Caliper with EPB Rear Setup
B7 A4, S4, and RS4 owners shop this kit when repeated high-speed braking, mountain driving, or track use has exposed iron-rotor heat fade, heavy brake dust, or front-end weight. This StopFlex kit pairs a 400mm front carbon-ceramic rotor with the Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper and a 380mm rear carbon-ceramic package to add thermal capacity while reducing rotating mass versus comparable iron hardware. Each kit is built around the buyer’s exact A4, S4, or RS4 trim because B7 upright geometry, hub position, rotor-hat offset, and wheel clearance cannot be treated as one platform-wide fitment.
- 400mm front carbon-ceramic rotors require 20 inch or larger wheels on the 2005-2008 Audi A4 / S4 / RS4 B7, and spoke clearance must be checked with the final wheel spec.
- The front axle uses the Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper, not a generic six-piston casting, with brackets and hat offsets matched to the confirmed B7 trim.
- The rear package uses 380mm carbon-ceramic rotors with a TTSPORT EP4 4-Piston Caliper with EPB hardware, but factory B7 cars use a manual cable handbrake, so parking-brake integration must be confirmed during order engineering.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Audi A4 / S4 / RS4 (B7) |
| Model years | 2005-2008 |
| Front setup | Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper / 400mm |
| Rear setup | TTSPORT EP4 4-Piston Caliper with EPB / 380mm |
| Page type | Complete CCB kit upgrade |
| Minimum wheel size | 20" (for the 400 mm front rotor) |
Every StopFlex kit is bespoke-engineered for your exact model and trim — the brackets, rotor-hat offsets, and caliper mounting are matched to your specific car, not assumed from the platform. This matters because trims that share a chassis name can differ mechanically: a pure M or performance variant often carries different front knuckles/uprights, hub geometry, and wheel axial (ET) clearance than the standard models in the same family, so a bracket and hat offset that bolt onto one are not the same parts that fit the other. StopFlex supplies the calipers, pads, rotor hats, floating hardware, and brake lines as a matched system built to your confirmed trim. Cars with modified knuckles, modified uprights, or non-factory suspension mounting points must be reviewed before ordering and are not treated as direct-fit.
This setup uses a 400 mm front rotor, so the minimum wheel size is 20". Wheels under 20" will not clear the caliper and rotor, and spoke profile and offset affect clearance too — 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 |
Caliper Overview — Front & Rear Balance
Front Caliper (Primary Upgrade)
The Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper is the primary front upgrade and spreads hydraulic load across six pistons for more even pad loading, stronger clamp control, and a firmer pedal under repeated stops. Its credibility comes from being a genuine OEM-derived Audi RS/Akebono caliper rather than an anonymous aftermarket body, and StopFlex engineers the mount and rotor-hat relationship around the buyer’s exact B7 A4, S4, or RS4 front upright and hub geometry.
Rear Caliper (Balance)
The TTSPORT EP4 4-Piston Caliper with EPB adds rear-axle thermal capacity and helps keep braking balance stable with the 400mm front package. The EP4 design uses four hydraulic service pistons plus a dedicated EPB actuator piston, but because the Audi B7 A4/S4/RS4 factory parking brake is cable-operated, StopFlex must confirm the customer’s parking-brake requirement before final rear configuration.
Front & rear, engineered together: A 400mm front-only conversion can shift the car toward front-heavy brake behavior if the rear axle is left as an afterthought. StopFlex matches the 400mm front and 380mm rear carbon-ceramic assemblies together so piston area, rotor diameter, hat offset, bracket geometry, and wheel clearance are engineered as one system for the confirmed trim.
Make It Yours — Color & Logo Customization
Every StopFlex kit-upgrade order can be finished with custom caliper colors, a custom caliper logo, and custom rotor hat colors, so the brake package matches your exact build instead of a fixed off-the-shelf look.
- Custom caliper color
- Custom caliper logo
- Custom rotor hat color
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.
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 |
|---|---|
| Front calipers | Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper |
| Front CCB rotors | 400mm |
| Rear calipers | TTSPORT EP4 4-Piston Caliper with EPB |
| Rear CCB rotors | 380mm |
| CCB brake pads | Matched for the supplied StopFlex carbon ceramic rotors |
| Rotor hats and floating hardware | Vehicle-specific hardware package |
| Brake lines | Included for complete kit-upgrade orders |
| Color customization | Custom caliper colors, a custom caliper logo, and custom rotor hat colors are available for every kit-upgrade order. |
| 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. |
FAQ
Will this kit fit every 2005-2008 Audi A4, S4, and RS4 B7 the same way?
No. StopFlex does not treat the B7 chassis as one universal bolt-on fitment; A4, S4, and RS4 trims can differ in upright, hub, offset, and wheel-clearance details, so brackets, rotor hats, and caliper mounting are engineered for the confirmed car.
What wheel size do I need for the 400mm front rotor?
The 400mm front carbon-ceramic rotor requires 20 inch or larger wheels. Wheel diameter alone is not enough; StopFlex also checks barrel shape, spoke clearance, offset, and caliper template fitment for the Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper.
Will the rear electronic parking brake work on my B7?
The Audi B7 A4/S4/RS4 did not leave the factory with an EPB; it uses a manual cable handbrake. The listed TTSPORT EP4 rear caliper includes EPB architecture, so the rear parking-brake solution must be confirmed during order engineering for the exact car.
Why choose carbon-ceramic rotors instead of another iron big-brake kit?
Carbon-ceramic rotors reduce rotating and unsprung mass compared with similarly sized iron rotors, produce far less visible brake dust, and tolerate repeated heat cycles better in high-speed street, mountain, and track use when paired with the correct pads and caliper balance.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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