2013-2020 Mercedes-Benz SL-Class / AMG (R231) CCB Big Brake Kit | Alcon RC6 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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2013-2020 Mercedes-Benz SL400 / SL450 / SL500 / SL550 / SL63 / SL65 (R231) CCB Big Brake Kit — Genuine Alcon RC6 6-Piston Caliper Front + Genuine Alcon RC4 4-Piston Caliper Rear Setup
The R231 SL is heavy, fast, and often driven on large open wheels, so owners usually shop carbon-ceramic brakes to reduce iron-rotor dust, manage repeated high-speed heat, and cut rotating mass without giving up street manners. This StopFlex kit pairs 380mm carbon-ceramic rotors with a Genuine Alcon RC6 6-Piston Caliper up front and a Genuine Alcon RC4 4-Piston Caliper at the rear for matched torque capacity on SL400, SL450, SL500, SL550, SL63, and SL65 builds. Every bracket, rotor-hat offset, and caliper position is engineered around the customer’s confirmed R231 trim rather than assumed from the SL chassis name.
- 380mm front and rear carbon-ceramic rotors require 19-inch or larger wheels on the R231 SL; barrel and spoke clearance are verified before production.
- Front braking is handled by the Genuine Alcon RC6 6-Piston Caliper, giving the R231 a stiffer multi-piston clamping layout than a basic iron rotor refresh.
- SL63 and SL65 AMG variants are not treated as interchangeable with SL400, SL450, SL500, or SL550 cars; StopFlex matches brackets and hat offsets to the exact trim and wheel package.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Mercedes-Benz SL400 / SL450 / SL500 / SL550 / SL63 / SL65 (R231) |
| Model years | 2013-2020 |
| Front setup | Genuine Alcon RC6 6-Piston Caliper / 380mm |
| Rear setup | Genuine Alcon RC4 4-Piston Caliper / 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 axle uses the Genuine Alcon RC6 6-Piston Caliper, the primary hardware change in this R231 kit. Its six-piston layout spreads pad load across the 380mm carbon-ceramic rotor to support consistent clamping force, firmer pedal response, and better heat distribution during repeated braking. Alcon is a recognized performance brake manufacturer, and this genuine caliper is selected for its rigid motorsport-derived construction rather than cosmetic caliper enlargement.
Rear Caliper (Balance)
The rear axle uses the Genuine Alcon RC4 4-Piston Caliper with a 380mm carbon-ceramic rotor, so rear brake torque is matched to the larger front system instead of left as an afterthought. The rear package is engineered to retain the R231’s factory electronic parking brake function where applicable.
Front & rear, engineered together: The RC6 front and RC4 rear setup is engineered as a complete brake system so piston area, rotor diameter, pad choice, and hydraulic behavior work with the SL’s stability-control and brake-bias requirements. On an R231, a front-only big brake conversion can overwork the front axle and leave rear contribution unchanged; this kit is built to keep braking balance front to rear.
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 Alcon RC6 6-Piston Caliper |
| Front CCB rotors | 380mm |
| Rear calipers | Genuine Alcon RC4 4-Piston Caliper |
| 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. |
FAQ
Will this kit fit my exact R231 SL trim?
Fitment is confirmed per vehicle, not by the R231 platform name alone. StopFlex verifies your year, trim, front knuckle/upright configuration, hub geometry, wheel size, wheel offset, and spoke profile before producing the brackets, rotor hats, and caliper mounts for an SL400, SL450, SL500, SL550, SL63, or SL65.
What wheel size do I need for the 380mm carbon-ceramic rotors?
The minimum wheel diameter is 19 inches because this kit uses 380mm rotors front and rear. Some 19-inch wheels still need a spoke-clearance check for the Genuine Alcon RC6 6-Piston Caliper, so wheel model, width, offset, and a clearance template should be confirmed before ordering.
Will the electronic parking brake still work?
Yes, the rear package is engineered around the R231’s factory electronic parking brake system where equipped. StopFlex confirms the exact rear configuration before production so the Genuine Alcon RC4 4-Piston Caliper package and EPB hardware are specified correctly for the car.
Why choose carbon-ceramic instead of replacing the factory iron brakes?
Carbon-ceramic rotors reduce brake dust, resist heat buildup during repeated high-speed stops, and lower rotating mass compared with conventional iron rotors. On a Mercedes-Benz SL R231 used for fast road driving, mountain driving, or occasional track use, the payoff is cleaner wheels, more stable pedal behavior, and less thermal stress than another standard iron rotor service.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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