2019-2026+ Mercedes-Benz AMG GT (X290) 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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2019-2026+ Mercedes-Benz AMG GT43 / GT53 / GT63 / GT63 S / GT63 S 4-Door (X290) CCB Big Brake Kit — Genuine OEM AMG 6-Piston Caliper Front + Genuine OEM AMG EPB Single-Piston Caliper Rear Setup
The X290 AMG GT 4-Door is heavy, fast, and hard on front brakes, especially when a GT53 or GT63 S sees repeated highway deceleration, mountain use, or track-day heat. This StopFlex kit pairs a Genuine OEM AMG 6-Piston Caliper with a 390mm front carbon-ceramic rotor and a 360mm EPB-compatible rear setup to reduce heat fade, brake dust, and rotating mass while keeping the car’s braking hardware matched front to rear. Each kit is built to the buyer’s confirmed X290 trim, so rotor-hat offset, brackets, lines, and caliper placement are specified for that car instead of assumed from the shared platform.
- 390mm front carbon-ceramic rotors require 20-inch or larger wheels on the AMG GT 4-Door X290; spoke clearance still has to be checked against the Genuine OEM AMG 6-Piston Caliper.
- The rear package uses a 360mm carbon-ceramic rotor with a Genuine OEM AMG EPB Single-Piston Caliper, preserving the electronic parking brake architecture used on the X290.
- GT43, GT53, GT63, GT63 S, and GT63 S E Performance variants can differ in brake package, hub geometry, and wheel offset, so StopFlex confirms the exact trim before machining hats and brackets.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Mercedes-GT43 / GT53 / GT63 / GT63 S / GT63 S 4-Door (X290) |
| Model years | 2019-2026+ |
| Front setup | Genuine OEM AMG 6-Piston Caliper / 390mm |
| Rear setup | Genuine OEM AMG EPB Single-Piston Caliper / 360mm |
| 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 Genuine OEM AMG 6-Piston Caliper, giving the 390mm rotor a broad, rigid clamping interface for consistent pedal response under repeated high-speed stops. Because this is an OEM AMG-derived caliper rather than a generic aftermarket casting, it is matched to the type of brake load and wheel packaging Mercedes uses on the GT 4-Door. StopFlex builds the rotor hat, bracket, hardware, and line package around this exact caliper for the confirmed X290 trim.
Rear Caliper (Balance)
The rear axle uses the Genuine OEM AMG EPB Single-Piston Caliper with a 360mm carbon-ceramic rotor to maintain rear brake contribution without upsetting front-to-rear bias. The EPB rear caliper keeps the factory electronic parking brake function integrated with the kit.
Front & rear, engineered together: The 390mm front and 360mm rear carbon-ceramic package is engineered as a system, not a front-only caliper swap. Matching the rear rotor, rear caliper function, hat offsets, and line routing helps maintain braking stability, ABS behavior, and pedal consistency on the AMG GT 4-Door X290.
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 EPB Single-Piston Caliper |
| Rear CCB rotors | 360mm |
| 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 GT43, GT53, GT63, or GT63 S X290?
Fitment is confirmed by exact trim, model year, factory brake package, and wheel setup before the kit is built. StopFlex does not treat all X290 cars as mechanically identical; brackets, rotor-hat offsets, and caliper mounting are specified for the confirmed vehicle.
What wheel size do I need for the 390mm front rotor?
The 390mm front rotor requires 20-inch or larger wheels. Wheels under 20 inches will not clear the rotor, and 20-inch wheels still need spoke-clearance verification against the Genuine OEM AMG 6-Piston Caliper.
Will the electronic parking brake still work?
Yes, this rear setup uses the Genuine OEM AMG EPB Single-Piston Caliper with a 360mm carbon-ceramic rotor, so the kit is designed around the X290 electronic parking brake system rather than deleting it.
Why switch an AMG GT 4-Door to carbon-ceramic brakes?
Carbon-ceramic rotors reduce brake dust, cut rotating mass, and tolerate repeated heat cycles better than conventional iron rotors in aggressive street or track use. For GT63 and GT63 S owners, they also provide a lower-maintenance alternative when replacing worn or heat-stressed high-performance brake hardware.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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