2019-2026+ BMW 3 Series / M3 (G20/G21/G80/G81) CCB Big Brake Kit | Alcon RC6 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+ BMW 3 Series / M3 (G20/G21/G80/G81) CCB Big Brake Kit — Genuine Alcon RC6 6-Piston Caliper Front + Genuine Alcon RC4 4-Piston Caliper Rear Setup
G20/G21 3 Series and G80/G81 M3 owners usually shop carbon-ceramic brakes after seeing iron-rotor heat fade, heavy brake dust on open wheels, or high replacement cost for factory carbon-ceramic parts. This StopFlex kit pairs 380 mm carbon-ceramic rotors with a Genuine Alcon RC6 6-Piston Caliper front setup and Genuine Alcon RC4 4-Piston Caliper rear setup for heat capacity, stable pedal feel, and reduced rotating mass. Each kit is engineered around the confirmed trim, because a standard G20 330i, an M340i, and a G80 M3 can require different brackets, rotor-hat offsets, and wheel-clearance checks.
- 380 mm carbon-ceramic rotors front and rear require 19-inch or larger wheels; barrel and spoke clearance must be verified against the exact wheel, not just the BMW chassis code.
- The front axle uses a Genuine Alcon RC6 6-Piston Caliper, giving the G20/G21/G80/G81 platform a motorsport-grade fixed-caliper clamping layout instead of relying on factory sliding or smaller OE configurations where applicable.
- StopFlex does not treat G20/G21 3 Series and G80/G81 M3 as one universal fitment; brackets and rotor-hat offsets are matched to the confirmed trim, brake package, and hub geometry.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | BMW 3 Series / M3 (G20/G21/G80/G81) |
| Model years | 2019-2026+ |
| Front setup | Genuine Alcon RC6 6-Piston Caliper / 380mm |
| Rear setup | Genuine Alcon RC4 4-Piston Caliper / 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 upgrade uses the Genuine Alcon RC6 6-Piston Caliper, selected to distribute clamping load across a larger pad area and support a firm, repeatable pedal on the 380 mm front rotor. Alcon is a proven performance-brake manufacturer, and this fixed-caliper architecture gives the front axle the stiffness and thermal margin needed for fast road use, repeated highway braking, and track sessions. StopFlex engineers the caliper position, bracket, and rotor-hat offset for the customer’s confirmed G20/G21/G80/G81 trim rather than assuming all 3 Series and M3 variants share the same front hardware.
Rear Caliper (Balance)
The rear axle uses a Genuine Alcon RC4 4-Piston Caliper with a 380 mm carbon-ceramic rotor to keep rear torque contribution and chassis stability aligned with the larger front system. For EPB-equipped builds, rear parking-brake compatibility is addressed during configuration so the customer does not order a rear setup that conflicts with the factory electronic parking-brake system.
Front & rear, engineered together: The RC6 front and RC4 rear package is engineered as a four-corner system, so piston area, rotor diameter, pad selection, and rear torque contribution are specified together. That matters on G20/G21/G80/G81 cars because adding only a large front brake can shift bias, change ABS behavior, and leave the rear axle thermally behind the front.
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 Alcon RC6 6-Piston Caliper |
| Front CCB rotors | 380mm |
| Rear calipers | Genuine Alcon RC4 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 G20, G21, G80, or G81 trim?
Fitment is confirmed per car before the kit is built. StopFlex matches brackets, rotor-hat offsets, and caliper mounting to the exact model, trim, brake package, and wheel setup because standard 3 Series and M3 variants can differ in knuckles, hubs, and clearance.
What wheel size do I need for the 380 mm setup?
The minimum wheel diameter is 19 inches because the kit uses 380 mm rotors. Wheel diameter alone is not enough; spoke profile, barrel shape, wheel width, and offset must also clear the Genuine Alcon RC6 6-Piston Caliper and rear RC4 package.
Will the electronic parking brake and auto-hold functions still work?
G20/G21/G80/G81 cars include EPB-equipped configurations, so rear brake specification must be confirmed during ordering. StopFlex reviews the exact car and rear setup so the kit is not treated as a generic rear-caliper swap that ignores EPB requirements.
Why switch from factory iron brakes or OEM carbon-ceramics?
Compared with iron brakes, this carbon-ceramic kit targets lower brake dust, reduced rotating mass, and better heat control during repeated high-speed stops. For cars already equipped with OEM carbon-ceramics, it can be a controlled replacement path when factory CCB service cost or cracked rotor replacement becomes the purchase driver.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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