2019-2026+ BMW 3 Series / M3 (G20/G21/G80/G81) CCB Big Brake Kit | Brembo BMW M5 F90 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 Brembo BMW M5 F90 6-Piston Front + TTSPORT EP4 4-Piston Caliper with EPB Rear Setup
G20/G21 3 Series and G80/G81 M3 owners shop carbon-ceramic brakes when repeated high-speed stops, track sessions, heavy front-axle heat, or iron-brake dust make the factory setup the limiting part of the car. This StopFlex kit pairs a Genuine Brembo OEM BMW M5 F90 6-Piston Caliper with a 400mm front carbon-ceramic rotor, then matches it to a 380mm EPB rear package so the brake system gains thermal capacity without deleting factory parking-brake function. Brackets, rotor-hat offsets, and caliper mounting are built for the confirmed trim, because a G20 330i, G20 M340i, G80 M3, and G81 M3 Touring can differ in upright geometry, hub position, and wheel clearance.
- 400mm front carbon-ceramic rotors require 20-inch or larger wheels; wheels under 20 inches will not clear this kit, and spoke clearance must still be measured.
- Front braking is handled by the Genuine Brembo OEM BMW M5 F90 6-Piston Caliper, supplied as the OEM BMW M5 (F90) caliper option for this kit.
- Rear braking uses a TTSPORT EP4 4-Piston Caliper with EPB on a 380mm carbon-ceramic rotor, preserving electronic parking-brake function on G20/G21/G80/G81 applications equipped with factory EPB.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | BMW 3 Series / M3 (G20/G21/G80/G81) |
| Model years | 2019-2026+ |
| Front setup | Genuine Brembo OEM BMW M5 F90 6-Piston Caliper / 400mm |
| Rear setup | TTSPORT EP4 4-Piston Caliper with EPB / 380mm |
| Page type | Complete CCB kit upgrade |
| Minimum wheel size | 20" (for the 400 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 400 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 Brembo OEM BMW M5 F90 6-Piston Caliper, a proven OEM-derived Brembo unit selected for high clamping stability, consistent pad support, and a firmer high-load pedal than the smaller factory iron-brake packages. For this page, the front option mapping is the OEM BMW M5 (F90) caliper, supplied as the Genuine Brembo OEM BMW M5 F90 6-Piston unit with StopFlex carbon-ceramic rotors, hats, pads, hardware, and lines. Its OEM performance-car origin gives the buyer a known caliper architecture instead of an unverified universal casting.
Rear Caliper (Balance)
The rear axle uses the TTSPORT EP4 4-Piston Caliper with EPB on a 380mm carbon-ceramic rotor to add rear thermal capacity and support stable brake balance under repeated deceleration. The EP4 uses 4 hydraulic service pistons plus a dedicated EPB actuator piston, so the car retains electronic parking-brake convenience rather than relying on a separate workaround.
Front & rear, engineered together: This kit is engineered as a front-and-rear system so the 400mm front rotor and M5 F90 6-piston caliper are not paired with an undersized rear package. StopFlex matches brackets, hat offsets, rear EPB integration, and hydraulic hardware to the buyer’s confirmed G20/G21/G80/G81 trim to avoid the bias, clearance, and mounting problems that can come from mixing front-only upgrades across standard and M chassis variants.
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 Brembo OEM BMW M5 F90 6-Piston Caliper |
| Front CCB rotors | 400mm |
| Rear calipers | TTSPORT EP4 4-Piston Caliper with EPB |
| 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 | OEM BMW M5 (F90) caliper, supplied as the Genuine Brembo OEM BMW M5 F90 6-Piston unit. |
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. |
TTSPORT EP4S rear caliper specification (the EP4 shares the same engineering, slightly more compact):
| Specification | EP4S |
|---|---|
| Axle position | Rear |
| Piston count | 4 hydraulic + 1 EPB actuator |
| Piston type | Two-piece heat-insulated, dust boots + EPB actuator |
| Piston diameter | 28 mm × 4 / 27 mm × 1 |
| Total piston area | 30.4 cm² per caliper |
| Manufacturing process | Two-piece forged aluminum body |
| Net weight | 4.50 kg per caliper (no pads) |
| Surface finish | High-temperature gloss coating |
| Recommended wheel size | 18 in or larger |
FAQ
Will this kit fit my exact G20, G21, G80, or G81 trim?
Fitment is not assumed from the chassis code. StopFlex confirms your exact model, trim, factory brake package, hub/upright configuration, wheel diameter, wheel offset, and spoke clearance before engineering the brackets, rotor hats, and caliper mounting for that car.
What wheel size do I need for the 400mm front rotor?
This kit requires 20-inch or larger wheels because the largest rotor is 400mm. A 20-inch barrel is the starting point only; spoke clearance must also be checked against the Genuine Brembo OEM BMW M5 F90 6-Piston Caliper.
Will the electronic parking brake still work?
Yes, the rear package uses the TTSPORT EP4 4-Piston Caliper with EPB, which includes hydraulic service pistons for braking and a dedicated EPB actuator piston for parking-brake function. This is why the rear is engineered as an EPB-compatible package instead of a race-only rear caliper.
Why switch this BMW from iron rotors to carbon-ceramic?
Carbon-ceramic rotors reduce brake dust, improve repeated-stop heat resistance, and cut rotating unsprung mass compared with typical iron rotor packages. On a fast G20/G21 3 Series or G80/G81 M3, the 400mm front and 380mm rear setup is aimed at owners who want stronger thermal capacity without treating the car as a universal platform fitment.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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