2019-2023 Mercedes-Benz CLS-Class / AMG (C257) CCB Big Brake Kit | OEM AMG 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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2019-2023 Mercedes-Benz CLS350 / CLS450 / CLS53 (C257) CCB Big Brake Kit — Genuine OEM AMG 6-Piston Caliper Front + Genuine OEM AMG 4-Piston Caliper Rear Setup
C257 CLS350, CLS450, and CLS53 owners usually shop carbon-ceramic brakes to reduce iron-rotor heat fade, heavy brake dust, and front-end mass while keeping the car suitable for fast road use and repeated high-speed stops. This StopFlex kit pairs a Genuine OEM AMG 6-Piston Caliper with a 390 mm front carbon-ceramic rotor and matches it to a Genuine OEM AMG 4-Piston Caliper with a 380 mm rear rotor. Brackets, rotor-hat offsets, caliper position, lines, pads, and hardware are engineered for the customer’s confirmed CLS trim, not assumed from the C257 chassis name.
- 390 mm front and 380 mm rear carbon-ceramic rotors require 20-inch or larger wheels; spoke clearance must be checked before ordering.
- Front braking is built around the exact Genuine OEM AMG 6-Piston Caliper, giving the C257 CLS a larger fixed-caliper front package than standard street-oriented iron setups.
- CLS350, CLS450, and CLS53 C257 fitment is handled per confirmed trim because AMG and non-AMG variants can differ in knuckles, hub geometry, mounting points, and wheel offset clearance.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Mercedes-Benz CLS350 / CLS450 / CLS53 (C257) |
| Model years | 2019-2023 |
| Front setup | Genuine OEM AMG 6-Piston Caliper / 390mm |
| Rear setup | Genuine OEM AMG 4-Piston Caliper / 380mm |
| Page type | Complete CCB kit upgrade |
| Minimum wheel size | 20" (for the 390 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 390 mm front rotor, so the minimum wheel size is 20". Wheels under 20" 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 exact Genuine OEM AMG 6-Piston Caliper, a fixed multi-piston unit that spreads clamping load across the pad for stable pedal response and even pressure on the 390 mm carbon-ceramic rotor. Its OEM AMG provenance matters on a C257 CLS because the caliper architecture is derived from a factory performance application rather than a generic aftermarket casting. StopFlex supplies the caliper as part of the complete engineered package with the correct mounting hardware, lines, pads, hats, and rotor offsets for the confirmed trim.
Rear Caliper (Balance)
The rear axle uses a Genuine OEM AMG 4-Piston Caliper with a 380 mm carbon-ceramic rotor to keep rear torque, stability, and heat capacity matched to the larger front system. Because the C257 CLS uses an electric parking brake system, EPB function is addressed during rear-kit engineering and order confirmation.
Front & rear, engineered together: A 390 mm front-only conversion can shift brake torque and thermal capacity forward if the rear package is not matched. This StopFlex kit engineers the front and rear calipers, rotor diameters, pad selection, hats, and lines as one system so the CLS retains predictable brake balance under repeated deceleration.
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 OEM AMG 6-Piston Caliper |
| Front CCB rotors | 390mm |
| Rear calipers | Genuine OEM AMG 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 CLS350, CLS450, or CLS53?
StopFlex does not treat all C257 cars as mechanically identical. Before production, your exact year, trim, drivetrain, wheel specs, hub details, and brake configuration are confirmed so the brackets, rotor-hat offsets, caliper mounting, lines, and hardware match your car.
What wheel size do I need for the 390 mm front rotor?
The 390 mm front rotor requires 20-inch or larger wheels. Wheel diameter alone is not enough; inner barrel shape and spoke clearance must also clear the Genuine OEM AMG 6-Piston Caliper.
Will the electric parking brake still work?
The C257 CLS uses an electric parking brake system, so rear fitment is handled with EPB compatibility in mind. StopFlex confirms the rear configuration before production so the Genuine OEM AMG 4-Piston Caliper package is supplied for the correct vehicle setup.
Why move from iron brakes to carbon-ceramic on this CLS?
Carbon-ceramic rotors reduce brake dust, cut rotating and unsprung mass, and handle repeated heat cycles better than conventional iron rotors in aggressive road or track-style use. On this kit, the payoff is tied to the 390 mm front and 380 mm rear rotor package, not just a pad change.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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