2019-2023 Mercedes-Benz CLS-Class / AMG (C257) 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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2019-2023 Mercedes-Benz CLS350 / CLS450 / CLS53 (C257) CCB Big Brake Kit — Genuine Brembo GT6 Front + Genuine Brembo GT4 Rear Setup
The 2019-2023 Mercedes-Benz CLS C257 is heavy, fast, and often driven on open-spoke wheels where iron rotor dust and repeated high-speed heat cycles are easy to notice. This StopFlex Kit Upgrade replaces the factory brake package with 380mm carbon-ceramic rotors, Brembo V6 / GT6 / GTS6 6-piston front caliper options, and matching Brembo V4 / GT4 / GTS4 4-piston rear caliper options to reduce unsprung mass, improve heat stability, and control front-to-rear brake balance. Each kit is engineered for the confirmed CLS350, CLS450, or CLS53 trim, not treated as a generic C257 bolt-on.
- 380mm front and rear carbon-ceramic rotors require 19-inch or larger wheels on the C257 CLS; spoke clearance still must be verified against the selected Brembo caliper profile.
- Front choices are V6 = Genuine Brembo OEM Cadillac CTS-V 6-Piston Caliper, GT6 = Genuine Brembo GT | M6 6-Piston Caliper, and GTS6 = Genuine Brembo GT | S6 6-Piston Caliper, each paired with a 380mm rotor.
- CLS350, CLS450, and AMG CLS53 C257 trims can differ in uprights, hub offsets, and wheel clearance, so StopFlex machines the brackets and rotor hats for the buyer’s exact trim and wheel data.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Mercedes-Benz CLS350 / CLS450 / CLS53 (C257) |
| Model years | 2019-2023 |
| 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, giving the C257 CLS a six-piston fixed-caliper layout for stronger pad support, controlled clamping force, and a firmer pedal under repeated braking. The buyer chooses among V6 = Genuine Brembo OEM Cadillac CTS-V 6-Piston Caliper, GT6 = Genuine Brembo GT | M6 6-Piston Caliper, or GTS6 = Genuine Brembo GT | S6 6-Piston Caliper, all paired with 380mm front carbon-ceramic rotors. These are genuine Brembo calipers, selected for proven motorsport and OEM-performance architecture rather than generic castings.
Rear Caliper (Balance)
The rear axle uses Brembo V4 / GT4 / GTS4 4-Piston Caliper Options with 380mm carbon-ceramic rotors to keep rear torque contribution matched to the upgraded front system. The C257 CLS uses an electronic parking brake, so rear integration is handled as part of the trim-specific engineering review.
Front & rear, engineered together: The 380mm front and 380mm rear package is engineered as a system so pad area, rotor diameter, hat offset, and caliper position work with the CLS stability-control and ABS behavior. Matching the rear conversion to the front upgrade avoids the bias shift that can occur when a high-torque front big brake kit is installed without rear-system planning.
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 |
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?
Fitment is confirmed per vehicle before production. StopFlex does not assume all C257 CLS trims share the same knuckles, hub geometry, rotor-hat offset, or wheel clearance; the brackets and hats are specified for your exact year, trim, and wheel setup.
What wheel size is required for the 380mm setup?
The 380mm rotors require 19-inch or larger wheels. Wheel diameter alone is not enough; spoke shape, barrel profile, offset, and the chosen Brembo V6, GT6, or GTS6 front caliper must be checked before the kit is built.
Will the electronic parking brake still work?
The C257 CLS uses a factory electronic parking brake, and rear-kit planning accounts for EPB retention. StopFlex verifies the exact rear configuration during order review so the Brembo V4, GT4, or GTS4 rear option is integrated correctly.
Why choose carbon-ceramic over the factory iron brakes on this CLS?
Carbon-ceramic rotors reduce brake dust, resist heat-related fade during repeated high-speed braking, and cut rotating unsprung mass compared with iron rotors. On a CLS450 or CLS53 with open wheels, the cleaner wheel face and more stable pedal feel are often as important as the heat capacity.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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