2016-2024 Audi A4 / S4 / RS4 (B9) CCB Big Brake Kit | Akebono 8N 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
2016-2024 Audi A4 / S4 / RS4 (B9) CCB Big Brake Kit — Genuine Akebono OEM Audi RS 6-Piston (8N) Caliper Front + TTSPORT EP4 4-Piston Caliper with EPB Rear Setup
The 2016-2024 Audi B9 A4, S4 and RS4 owner shopping this kit is usually trying to fix heat fade, iron-rotor dust, repeated rotor service or the cost of replacing high-performance brake hardware. StopFlex builds this upgrade around 380mm carbon-ceramic rotors, a Genuine Akebono OEM Audi RS 6-Piston (8N) Caliper front setup and TTSPORT EP4 4-Piston Caliper with EPB rear calipers for higher thermal capacity, lower brake dust and reduced rotating mass. Because A4, S4 and RS4 trims can differ in uprights, hub geometry and wheel clearance, the brackets and rotor hats are engineered to the confirmed car rather than treated as a generic B9 fit.
- 380mm front and rear carbon-ceramic rotors require 19 inch or larger wheels on this B9 Audi application; spoke clearance still has to be measured against the Akebono front caliper body.
- The front axle uses the Genuine Akebono OEM Audi RS 6-Piston (8N) Caliper, giving this A4/S4/RS4 upgrade an OEM-derived six-piston pressure distribution instead of a generic aftermarket caliper swap.
- The rear axle uses the TTSPORT EP4 4-Piston Caliper with EPB so the B9 Audi keeps electronic parking-brake function while adding rear rotor and pad capacity to match the 380mm front system.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Audi A4 / S4 / RS4 (B9) |
| Model years | 2016-2024 |
| Front setup | Genuine Akebono OEM Audi RS 6-Piston (8N) Caliper / 380mm |
| Rear setup | TTSPORT EP4 4-Piston Caliper with EPB / 380mm |
| Page type | Complete CCB kit upgrade |
| Minimum wheel size | 19" (for the 380 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 380 mm front 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.
| 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 (8N) Caliper, a six-piston fixed caliper selected to spread clamp load across the pad and give a firmer, more consistent pedal under repeated high-speed stops. Its OEM Audi RS provenance matters on a B9 A4/S4/RS4 build because it is based on production performance hardware rather than an unproven universal caliper. StopFlex pairs it with the correct 380mm carbon-ceramic rotor, hat offset, bracket and line package for the customer's confirmed trim.
Rear Caliper (Balance)
The rear caliper is the TTSPORT EP4 4-Piston Caliper with EPB, which adds four hydraulic service pistons at the rear axle while retaining the electronic parking-brake function expected on the B9 Audi. Its rear brake contribution helps keep the car stable during hard deceleration instead of leaving the rear axle undersized behind a large front upgrade.
Front & rear, engineered together: This kit is engineered as a front-and-rear system so the 380mm Genuine Akebono front package and 380mm TTSPORT EP4 rear package work with matched rotor sizing, piston behavior, pad selection and vehicle-specific mounting geometry. That matters on the B9 A4/S4/RS4 because a front-only big-brake conversion can shift thermal load and pedal feel without giving the rear axle enough capacity or preserving OE EPB behavior.
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 (8N) Caliper |
| Front CCB rotors | 380mm |
| 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 380mm kit fit my exact 2016-2024 Audi B9 A4, S4 or RS4?
Fitment is confirmed per vehicle, not assumed from the B9 chassis label. StopFlex matches brackets, rotor-hat offsets and caliper mounting to the exact A4, S4 or RS4 trim because uprights, hub geometry and wheel clearance can differ across the family.
What wheel size do I need for the 380mm carbon-ceramic setup?
The largest rotor in this kit is 380mm, so wheels under 19 inches will not clear it. A 19 inch or larger wheel is still not automatic approval because spoke shape, wheel offset and caliper barrel clearance must be checked against the Genuine Akebono OEM Audi RS 6-Piston (8N) Caliper.
Will the electronic parking brake still work?
Yes, this kit uses the TTSPORT EP4 4-Piston Caliper with EPB at the rear. The EP4 uses four hydraulic service pistons for braking and a dedicated EPB actuator piston so the Audi retains electronic parking-brake convenience while gaining rear-axle thermal capacity.
Why choose carbon-ceramic rotors instead of another iron big-brake kit?
Carbon-ceramic rotors reduce brake dust, resist heat-related fade and lower rotating mass compared with typical iron brake hardware. On a B9 A4/S4/RS4 driven hard on mountain roads, track days or repeated high-speed stops, the 380mm carbon-ceramic rotor package gives more thermal headroom than a cosmetic caliper-only upgrade.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
More Contact Information
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