2012-2020 Mercedes-Benz SLK-Class / AMG (R172) CCB Big Brake Kit | AP Racing 9560 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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2012-2020 Mercedes-Benz SLK250 / SLK300 / SLK350 / SLK55 / Mercedes-Benz SLC300 / SLC43 (R172) CCB Big Brake Kit — Genuine AP Racing CP9560 Radi-CAL II 6-Piston Caliper Front + Genuine AP Racing CP9541 Radi-CAL II 4-Piston Caliper Rear Setup
R172 SLK and SLC owners usually shop this kit when the factory iron brakes produce heat fade, heavy dust, or repeated rotor replacement costs after mountain driving, autocross, or track use. StopFlex replaces the factory package with 380mm carbon-ceramic rotors at all four corners, a Genuine AP Racing CP9560 Radi-CAL II 6-Piston Caliper front setup, and a Genuine AP Racing CP9541 Radi-CAL II 4-Piston Caliper rear setup for higher heat capacity, lower rotating mass, and cleaner open-wheel presentation. Each kit is engineered to the confirmed SLK250, SLK300, SLK350, SLK55, SLC300, or SLC43 configuration, including brackets, hat offsets, and caliper position.
- 380mm front and rear carbon-ceramic rotors require 19-inch or larger wheels on the R172 chassis; spoke clearance must still be checked before production.
- Front braking is handled by the Genuine AP Racing CP9560 Radi-CAL II 6-Piston Caliper, matched to a 380mm rotor for repeated high-speed stops in a compact roadster chassis.
- SLK55 AMG and SLC43 fitment is validated separately from SLK250, SLK300, SLK350, and SLC300 because AMG/performance trims can use different knuckle, hub, and wheel-clearance geometry.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Mercedes-Benz SLK250 / SLK300 / SLK350 / SLK55 / Mercedes-Benz SLC300 / SLC43 (R172) |
| Model years | 2012-2020 |
| Front setup | Genuine AP Racing CP9560 Radi-CAL II 6-Piston Caliper / 380mm |
| Rear setup | Genuine AP Racing CP9541 Radi-CAL II 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 AP Racing CP9560 Radi-CAL II 6-Piston Caliper, giving the R172 a six-piston front clamp package for more even pad loading and a firmer response under repeated heat cycles. AP Racing is a known motorsport brake manufacturer, and this Radi-CAL II architecture is selected for a lightweight, rigid performance caliper body rather than a cosmetic caliper cover or generic casting. StopFlex positions the caliper on the 380mm carbon-ceramic rotor with brackets and offsets matched to the buyer's exact R172 trim.
Rear Caliper (Balance)
The rear axle uses the Genuine AP Racing CP9541 Radi-CAL II 4-Piston Caliper with a matching 380mm carbon-ceramic rotor so rear torque contribution is engineered with the front package instead of left to the factory rear brakes. On R172 cars with the factory electronic parking brake, the rear package is configured so parking-brake functionality is retained as part of the final fitment design.
Front & rear, engineered together: A 380mm front-only conversion can shift brake balance and thermal capacity away from the rear axle, especially on an SLK55 or SLC43 driven hard. This StopFlex kit is engineered as a front-and-rear system so piston area, rotor diameter, hat offset, pad selection, and line routing are validated together for the confirmed R172 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 AP Racing CP9560 Radi-CAL II 6-Piston Caliper |
| Front CCB rotors | 380mm |
| Rear calipers | Genuine AP Racing CP9541 Radi-CAL II 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 fit my exact SLK250, SLK300, SLK350, SLK55, SLC300, or SLC43?
The kit is built only after your exact R172 year, trim, wheel specs, and brake configuration are confirmed. StopFlex does not assume that an SLK55 AMG or SLC43 shares the same bracket, hat offset, or wheel clearance as a non-AMG SLK or SLC.
What wheel size do I need for the 380mm kit?
The 380mm front and rear rotors require 19-inch or larger wheels. Wheel diameter alone is not enough; spoke shape, barrel profile, offset, and caliper face clearance must be checked against the Genuine AP Racing CP9560 front caliper and CP9541 rear caliper.
Will the electronic parking brake still work?
Yes, the R172 rear package is designed around the car's factory electronic parking brake requirement. EPB compatibility is confirmed during order validation because the rear caliper, parking-brake hardware, bracket position, and rotor-hat geometry must work as a system.
Why switch this R172 from iron brakes to carbon-ceramic?
Carbon-ceramic rotors reduce brake dust, resist heat-related fade, and lower rotating unsprung mass compared with conventional iron rotors. On a compact roadster such as the SLK/SLC, that matters for steering feel, wheel cleanliness, and repeatable braking during fast road or track sessions.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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