2018-2026+ Audi A8 / S8 (D5) CCB Big Brake Kit | Akebono 10N 10-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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2018-2026+ Audi A8 / S8 (D5) CCB Big Brake Kit — Genuine Akebono OEM Audi RS 10-Piston (10N) Caliper Front + TTSPORT EP4 4-Piston Caliper with EPB Rear Setup
The D5 Audi A8 and S8 are heavy, high-speed luxury sedans, so repeated hard braking can expose the limits of iron-rotor heat capacity, dust control, and rotor mass. This StopFlex kit pairs a 420mm front carbon-ceramic rotor with a Genuine Akebono OEM Audi RS 10-Piston (10N) Caliper, then matches the rear with a 380mm carbon-ceramic rotor and TTSPORT EP4 4-Piston Caliper with EPB. The result is higher thermal reserve, lower brake dust, reduced rotating mass, and fitment engineered around the buyer’s exact A8 or S8 trim rather than the D5 platform name alone.
- 420mm front carbon-ceramic rotors require 21 inch or larger wheels; wheels under 21 inches will not clear the front package, and spoke clearance still must be checked.
- Front braking is built around the Genuine Akebono OEM Audi RS 10-Piston (10N) Caliper, giving the D5 A8/S8 a large OEM-derived fixed-caliper front upgrade instead of a generic aftermarket casting.
- The rear package uses a 380mm carbon-ceramic rotor with TTSPORT EP4 4-Piston Caliper with EPB, so the D5’s electronic parking brake function is retained while rear thermal capacity is increased.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Audi A8 / S8 (D5) |
| Model years | 2018-2026+ |
| Front setup | Genuine Akebono OEM Audi RS 10-Piston (10N) Caliper / 420mm |
| Rear setup | TTSPORT EP4 4-Piston Caliper with EPB / 380mm |
| Page type | Complete CCB kit upgrade |
| Minimum wheel size | 21" (for the 420 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 420 mm front rotor, so the minimum wheel size is 21". Wheels under 21" 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 axle uses the Genuine Akebono OEM Audi RS 10-Piston (10N) Caliper, a fixed 10-piston OEM-derived Audi RS caliper selected for broad pad support, high clamp distribution, and a firm pedal under repeated high-energy stops. Its credibility comes from genuine OEM Audi RS application rather than an unproven universal caliper, which matters on a heavy D5 A8/S8 where caliper stiffness and pad sweep must stay consistent at speed. StopFlex engineers the brackets, rotor-hat offset, and mounting geometry for the confirmed A8 or S8 trim before the kit is built.
Rear Caliper (Balance)
The rear axle uses the TTSPORT EP4 4-Piston Caliper with EPB on a 380mm carbon-ceramic rotor to add rear thermal capacity and keep the car stable under heavy braking. The EP4 uses four hydraulic service pistons plus a dedicated EPB actuator piston, so the factory electronic parking brake function is preserved.
Front & rear, engineered together: This kit is engineered as a front-and-rear system so the 420mm 10-piston front package is not paired with an undersized rear axle. Matching the rear caliper, rotor diameter, hat offset, and EPB function helps preserve brake balance, ABS behavior, and parking-brake convenience on the D5 A8/S8.
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 10-Piston (10N) Caliper |
| Front CCB rotors | 420mm |
| 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 every 2018-2026+ Audi A8 or S8 D5 the same way?
No. StopFlex does not treat the D5 chassis as a single universal fitment. The kit is built after confirming the exact A8 or S8 trim so the front brackets, rear brackets, rotor-hat offsets, and caliper mounting match that specific car.
What wheel size is required for the 420mm front rotor?
The 420mm front rotor requires 21 inch or larger wheels. Wheels under 21 inches will not clear the rotor and caliper package, and 21 inch wheels still need spoke-clearance verification against the Genuine Akebono OEM Audi RS 10-Piston (10N) Caliper.
Will the electronic parking brake still work?
Yes. The rear package uses the TTSPORT EP4 4-Piston Caliper with EPB, which has four hydraulic service pistons for braking and a dedicated EPB actuator piston for parking-brake operation.
Why switch a D5 A8 or S8 to carbon-ceramic rotors?
Carbon-ceramic rotors reduce brake dust, lower rotating and unsprung mass, and tolerate repeated high-temperature braking better than conventional iron rotors. On a heavy A8/S8, those gains matter most during fast road use, repeated highway-speed stops, and owners who want cleaner open-wheel appearance.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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