2012-2018 Mercedes-Benz CLS-Class / AMG (C218/X218) CCB Big Brake Kit | Brembo GT6 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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2012-2018 Mercedes-Benz CLS350 / CLS400 / CLS500 / CLS550 / CLS63 / CLS63 S (C218/X218) CCB Big Brake Kit — Genuine Brembo GT6 Front + Genuine Brembo GT4 Rear Setup
The C218/X218 CLS is heavy, fast, and often driven on large open-spoke wheels, so owners shopping this kit are usually trying to reduce iron-rotor heat fade, brake dust, and front-end rotating mass without guessing on fitment. This StopFlex kit pairs 380 mm carbon-ceramic rotors with Brembo V6 / GT6 / GTS6 6-Piston Caliper Options up front and Brembo V4 / GT4 / GTS4 4-Piston Caliper Options at the rear. Brackets, rotor-hat offsets, and caliper mounting are engineered to the buyer’s confirmed CLS350, CLS400, CLS500, CLS550, CLS63, or CLS63 S configuration, not assumed from the shared C218/X218 chassis name.
- 380 mm front and rear carbon-ceramic rotors require 19 inch or larger wheels on the C218/X218 CLS; barrel and spoke clearance are confirmed before build.
- Front choices are V6, GT6, or GTS6 6-piston Brembo calipers, each paired to a 380 mm rotor for the CLS front axle.
- Rear choices are V4, GT4, or GTS4 4-piston Brembo calipers on 380 mm rotors, so rear torque capacity is specified with the front upgrade instead of left as an iron-rotor mismatch.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Mercedes-Benz CLS350 / CLS400 / CLS500 / CLS550 / CLS63 / CLS63 S (C218/X218) |
| Model years | 2012-2018 |
| Front setup | Brembo V6 / GT6 / GTS6 6-Piston Caliper Options / 380mm |
| Rear setup | Brembo V4 / GT4 / GTS4 4-Piston Caliper Options / 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 Brembo V6 / GT6 / GTS6 6-Piston Caliper Options, selected by the buyer according to the required appearance, provenance, and package. V6 is the Genuine Brembo OEM Cadillac CTS-V 6-Piston Caliper on a 380 mm rotor; GT6 is the Genuine Brembo GT | M6 6-Piston Caliper on a 380 mm rotor; GTS6 is the Genuine Brembo GT | S6 6-Piston Caliper on a 380 mm rotor. The 6-piston layout spreads pad pressure across the swept area for consistent clamp load and a firmer pedal window under repeated high-speed stops.
Rear Caliper (Balance)
The rear axle uses Brembo V4 / GT4 / GTS4 4-Piston Caliper Options with 380 mm carbon-ceramic rotors to keep rear brake contribution matched to the larger front system. StopFlex configures the rear package around the confirmed car because the C218/X218 CLS uses a mechanical cable/foot-operated parking brake layout rather than a rear EPB motor that can be retained in the caliper.
Front & rear, engineered together: The front and rear calipers, rotor diameters, pad selection, hats, and brackets are specified together so the CLS keeps stable brake bias instead of adding front torque while leaving the rear axle under-matched. This matters on CLS63 and CLS63 S cars in particular because higher speeds and heavier braking loads expose front-only conversions quickly.
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 | Brembo V6 / GT6 / GTS6 6-Piston Caliper Options |
| Front CCB rotors | 380mm |
| Rear calipers | Brembo V4 / GT4 / GTS4 4-Piston Caliper Options |
| 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. |
| Front caliper option mapping | V6 = Genuine Brembo OEM Cadillac CTS-V 6-Piston Caliper — 380 mm rotor GT6 = Genuine Brembo GT | M6 6-Piston Caliper — 380 mm rotor GTS6 = Genuine Brembo GT | S6 6-Piston Caliper — 380 mm rotor |
| Rear caliper option mapping | V4 = Genuine Brembo OEM Cadillac CTS-V 4-Piston Caliper — 380 mm rotor GT4 = Genuine Brembo GT | M4 4-Piston Caliper — 380 mm rotor GTS4 = Genuine Brembo GT | S4 4-Piston Caliper — 380 mm rotor |
FAQ
Will this kit fit my exact CLS350, CLS400, CLS500, CLS550, CLS63, or CLS63 S?
Yes, but it is built after trim confirmation. StopFlex does not assume every C218/X218 CLS shares the same knuckle, hub position, or wheel clearance; the brackets, rotor-hat offsets, and caliper mounting are matched to the exact model and trim supplied at ordering.
What wheel size do I need for the 380 mm setup?
The largest rotor in this kit is 380 mm, so wheels under 19 inches will not clear it. A 19 inch or larger wheel is still checked for spoke clearance because Brembo 6-piston front calipers need both barrel diameter and face clearance.
Will my parking brake still work?
The C218/X218 CLS uses a mechanical cable/foot-operated parking brake arrangement, so this kit is engineered around that layout rather than an electronic parking brake motor. Parking-brake details are verified against the vehicle before the rear package is finalized.
Why choose carbon-ceramic rotors instead of another iron big brake kit?
Carbon-ceramic rotors reduce brake dust, resist heat-related fade, and cut rotating mass compared with equivalent iron rotors. On a CLS550, CLS63, or CLS63 S used for repeated highway-speed braking or track-day sessions, the main benefit is more consistent temperature behavior with less dust on large AMG-style wheels.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
More Contact Information
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