2012-2020 Mercedes-Benz SLK-Class / AMG (R172) Carbon Ceramic Big Brake Kit — AP Racing CP9560 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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Will This Fit My Car?
Full Upgrade CCB Big Brake Kits (With Calipers) for the 2012-2020 Mercedes-Benz SLK-Class / AMG (R172). This page's exact brake setup:
| Model Years | Front Setup | Rear Setup | Min. Wheel Size |
|---|---|---|---|
| 2012-2020 | AP Racing CP9560 Radi-CAL II 6-Piston Caliper / 380mm | AP Racing CP9541 Radi-CAL II 4-Piston Caliper / 380mm | 19" |
Every StopFlex kit is bespoke-engineered for your exact model and trim — brackets, rotor-hat offsets, and caliper mounting are matched to your specific car, never assumed from the platform. Trims that share a chassis name can differ mechanically: a pure performance variant often carries different knuckles, hub geometry, and wheel ET clearance than the standard models, so parts that bolt onto one are not the parts that fit the other. Calipers, pads, rotor hats, floating hardware, and brake lines ship as one matched system built to your confirmed trim. Modified knuckles, uprights, or non-factory suspension mounting points must be reviewed before ordering.
The 380 mm rotor sets the minimum wheel size at 19" — smaller wheels will not clear the caliper and rotor. Spoke profile and offset also affect clearance; 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 |
What's in the Box
| Item | Details |
|---|---|
| Product type | Full Upgrade CCB Big Brake Kits (With Calipers) |
| Front calipers | AP Racing CP9560 Radi-CAL II 6-Piston Caliper OE / Part No.: L CP9560-2SOBG4 · R CP9560-3SOBG4 |
| Front CCB rotors | 380mm |
| Rear calipers | AP Racing CP9541 Radi-CAL II 4-Piston Caliper OE / Part No.: L CP9541-2SOR12 · R CP9541-3SOR12 |
| Rear CCB rotors | 380mm |
| CCB brake pads | Matched ceramic-compatible compound for the supplied StopFlex carbon ceramic rotors |
| Rotor hats and floating hardware | Vehicle-specific hardware package |
| Brake lines | Included for complete kit-upgrade orders |
| 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. |
Make It Yours — Color & Logo Customization
Any kit order can be personalized: custom caliper colors, a custom caliper logo, and custom rotor hat colors, so the hardware behind your wheels matches the rest of the build.
- Custom caliper color
- Custom caliper logo
- Custom rotor hat color
Why Carbon Ceramic — and Why StopFlex
Long Street-Service Life
In normal road use with matched pads and correct bedding, one StopFlex CCB rotor set is engineered to outlast several sets of iron replacement rotors, recovering part of the up-front cost.
Low Visible Dust
Matched with StopFlex pads, the system sheds a fraction of the dust an iron rotor and pad combination throws. Wheels stay clean for weeks of driving instead of days.
Premium Ceramic-Glaze Finish
StopFlex's proprietary coating gives the disc a bright ceramic-glaze surface with subtle texture — the factory carbon-ceramic look, clearly visible through open wheel designs.
Continuous Fiber Construction
StopFlex discs are built with long continuous carbon fiber instead of chopped short fiber. Continuous strands carry load across the whole rotor body, raising strength and thermal durability under heat cycles.
Bespoke Per-Vehicle Engineering
Every order is machined to the confirmed vehicle and trim. Brackets, hat offsets, and pad shapes are built for that exact car — never pulled from a one-size-fits-all catalog.
CCB-Specific Pad Compound
A low-metallic resin pad compound reinforced with steel, copper, and aramid fiber, made for ceramic discs: stable to about 750 °C, roughly 0.44 average friction, strong fade resistance, low rotor wear.
Lower Unsprung Mass
A carbon-ceramic rotor weighs roughly half of the equivalent iron disc. Less rotating, unsprung mass lets the suspension follow broken pavement more cleanly and makes steering response noticeably sharper.
High-Temperature Stability
The carbon-silicon-carbide friction matrix keeps working at temperatures that push iron rotors into heavy fade, so the tenth hard stop feels like the first — same pedal travel, same bite point.
Rust-Free Rotor Surface
Ceramic discs cannot flash-rust. After rain, a wash, or weeks of parking, the rotor face behind your open-spoke wheels stays clean — no orange ring on a freshly detailed car.
Winter & Cold-Weather Braking
A cold, untuned carbon-ceramic disc needs more pedal than iron on the first winter stops — normal material physics. StopFlex engineered the pad formula and disc coating specifically for cold starts, closing that gap: cold-car winter feel is now very close to summer feel. Keep a little extra distance on the coldest mornings; for harsh winters, choose Street Spec.
Caliper Overview
Front Caliper
The front caliper is the AP Racing CP9560 Radi-CAL II 6-piston monoblock. Its stiff one-piece body keeps piston deflection low under heat, so pedal feel stays firm and consistent through repeated hard stops.
Rear Caliper
The rear caliper is the AP Racing CP9541 Radi-CAL II 4-piston, matched to the 380mm rear rotor to add rear thermal capacity and balance the front upgrade. On R172 trims with an electric parking brake, we integrate the factory EPB function into the rear setup.
Choose Your Rotor: Street, Track-Day, or Motorsport
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.
Heat Management Note
Carbon ceramic rotors tolerate extreme surface temperature, but they do not remove every heat-management requirement. During repeated hard stops, heat still soaks 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.
Get Your Fitment Confirmed
Share your year, model, trim, wheel size, current rotor dimensions, and caliper type — every order is verified against your VIN-level configuration before it goes to production.
FAQ
Will this kit actually fit my specific R172 trim, or is it a generic platform kit?
It is built for your confirmed trim, not the R172 platform as a whole. The SLK55 AMG and SLC43 use different front knuckles, hub geometry, and wheel clearance than an SLK250/300/350, so we machine trim-specific brackets and set rotor-hat offsets to match your exact car. We confirm the caliper mounting and hat stack against your build before anything ships.
What wheels do I need to clear these 380mm rotors?
The 380mm front and rear rotors require a minimum 19-inch wheel. Diameter alone is not enough, though; spoke shape and barrel clearance around the AP Racing CP9560 also matter, so send us your wheel details and we will verify caliper-to-spoke clearance before you buy.
How do these carbon-ceramic brakes behave in winter and cold starts?
A cold carbon-ceramic disc naturally bites a little less than cold iron on the first stops—that is physics, not a fault. We tuned both the pad compound and the disc's ceramic coating for cold operation, so cold-car braking now feels very close to warm summer feel. On the coldest first stops, leaving a bit of extra following distance is still smart until the discs come up to temperature.
Why go carbon-ceramic on an SLK/SLC instead of a factory iron parts swap?
There is no mainstream off-the-shelf BBK for the R172, which is why owners try to adapt W204 or E-Class parts. This kit removes that guesswork: the carbon-ceramic rotors cut unsprung and rotating mass over iron, resist fade far better on track days, and shed the brake dust that coats SLK wheels. Everything is engineered for your trim rather than borrowed from another chassis.
More Contact Information
We’re here to help! Whether you need expert advice on brake setups, have questions about your order, or just want to share feedback, our team is ready to assist you. Reach out via your preferred channel below, or use the inquiry form.
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