2009-2016 Audi A4 / S4 / RS4 (B8) 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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2009-2016 Audi A4 / S4 / RS4 (B8) CCB Big Brake Kit — Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper Front + TTSPORT EP4 4-Piston Caliper with EPB Rear Setup
The B8 Audi A4, S4, and RS4 buyer usually arrives here after exceeding the heat capacity of the factory iron brakes or after choosing a cleaner, lighter alternative to large iron rotors behind open 20-inch wheels. This StopFlex kit uses a 400mm front carbon-ceramic rotor with the Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper and a 380mm rear carbon-ceramic rotor with a TTSPORT EP4 4-Piston Caliper with EPB, giving the car front and rear thermal capacity instead of a front-only imbalance. Each kit is built for the confirmed trim, not for the B8 name alone, so the brackets, hat offsets, and caliper position are matched to the actual car before production.
- 400mm front rotors require 20-inch or larger wheels; wheels under 20 inches will not clear this StopFlex B8 kit, and spoke clearance must still be checked.
- The front axle uses the Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper with a 400mm carbon-ceramic rotor for high heat capacity and consistent pedal response under repeated braking.
- The rear axle uses a TTSPORT EP4 4-Piston Caliper with EPB and a 380mm carbon-ceramic rotor so B8 cars with factory electronic parking brake hardware keep EPB functionality.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Audi A4 / S4 / RS4 (B8) |
| Model years | 2009-2016 |
| 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 front caliper is the Genuine Akebono OEM Audi RS 6-Piston (9N) Caliper, a six-piston OEM-derived Audi RS unit selected for even pad loading across the large 400mm front rotor. Its fixed multi-piston layout improves clamping distribution and pedal consistency compared with smaller factory sliding-caliper arrangements. Because this is a genuine Akebono Audi RS caliper, the upgrade uses proven OE-performance hardware rather than an unbranded universal caliper.
Rear Caliper (Balance)
The rear caliper is the TTSPORT EP4 4-Piston Caliper with EPB, paired here with a 380mm rear rotor to add rear-axle heat capacity and keep the car stable under heavy braking. It uses four hydraulic service pistons for braking plus a dedicated EPB actuator piston, so factory electronic parking-brake convenience is retained on EPB-equipped B8 cars.
Front & rear, engineered together: The 400mm front and 380mm rear package is engineered as a complete system so piston area, rotor diameter, hat offset, and caliper placement are treated together instead of adding rear hardware after the fact. This matters on the B8 A4/S4/RS4 family because trim-level knuckle, hub, and wheel-offset differences can change where the caliper and rotor must sit for correct clearance and brake balance.
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. |
EPB & Rear Caliper Options
This vehicle leaves the factory with an electronic parking brake (EPB) built into the rear brake, so the rear of the kit is built to keep that EPB working. There are two rear paths. The first is a dual-caliper rear: a main performance caliper handles braking while a dedicated EPB actuator caliper is retained alongside it, so the electronic parking brake, auto-hold, and hill-start assist all keep working; on this path the rear performance caliper can be the TTSPORT EP4 / EP4S 4-piston caliper. The second is an EPB-integrated caliper, a single rear caliper with the electromechanical parking-brake motor built in for a cleaner install with fewer parts behind the wheel; on this path the rear is the TTSPORT EP4 / EP4S 4-piston caliper with integrated EPB. Which path fits best depends on your exact trim and EPB configuration, your budget, your appearance preference, and your wheel size and spoke clearance. Confirm your car's rear-brake configuration with StopFlex before ordering so the correct EPB-compatible rear option is built for your kit.
| Rear option | What it is | Rear caliper | Best when |
|---|---|---|---|
| Dual caliper (EPB retained) | Performance caliper plus a dedicated EPB actuator caliper, both fitted on the rear, so the factory electronic parking brake keeps working. | TTSPORT EP4 / EP4S 4-Piston Caliper | You want guaranteed factory EPB, auto-hold, and hill-start behavior preserved. |
| EPB-integrated caliper | A single rear caliper with the electromechanical parking-brake motor built in, for a cleaner install with fewer parts behind the wheel. | TTSPORT EP4 / EP4S 4-Piston Caliper with integrated EPB | You want a cleaner single-caliper rear with full EPB function. |
TTSPORT EP4S rear caliper specification (the EP4 shares the same engineering, slightly more compact):
| Specification | EP4S |
|---|---|
| Axle position | Rear |
| Piston count | 4 hydraulic + 1 EPB actuator |
| Piston type | Two-piece heat-insulated, dust boots + EPB actuator |
| Piston diameter | 28 mm × 4 / 27 mm × 1 |
| Total piston area | 30.4 cm² per caliper |
| Manufacturing process | Two-piece forged aluminum body |
| Net weight | 4.50 kg per caliper (no pads) |
| Surface finish | High-temperature gloss coating |
| Recommended wheel size | 18 in or larger |
FAQ
Will this kit fit my exact B8 A4, S4, or RS4 trim?
Fitment is confirmed before production. StopFlex builds the brackets, rotor-hat offsets, and caliper mounting for your exact year, trim, drivetrain, hub/upright configuration, and wheel package; it is not sold as a generic B8 platform bolt-on.
What wheel size do I need for the 400mm front rotor?
The 400mm front rotor requires 20-inch or larger wheels. Wheels under 20 inches will not clear the rotor, and StopFlex still checks spoke clearance because caliper face clearance varies by wheel design and offset.
Will the electronic parking brake still work?
Yes, when the car is an EPB-equipped B8 application and the kit is ordered with the TTSPORT EP4 4-Piston Caliper with EPB. The EP4 uses four hydraulic service pistons for braking plus a separate EPB actuator piston for parking-brake function.
Why choose carbon-ceramic rotors instead of another iron big-brake kit?
Carbon-ceramic rotors reduce brake dust, resist heat fade under repeated high-speed stops, and cut rotating unsprung mass compared with similar-size iron rotors. On this kit, the 400mm front and 380mm rear CCB rotors are matched to the Akebono OEM Audi RS front caliper and EP4 rear caliper rather than mixed with factory rear hardware.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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