2019-2026+ BMW 3 Series / M3 (G20/G21/G80/G81) 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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2019-2026+ BMW 3 Series / M3 (G20/G21/G80/G81) CCB Big Brake Kit — Genuine Brembo GT6 Front + TTSPORT EP4 4-Piston Caliper with EPB Rear Setup
G20/G21 3 Series and G80/G81 M3 owners usually shop carbon-ceramic brakes for one of three reasons: front-axle heat on repeated hard stops, heavy iron-brake dust on open wheels, or the cost of replacing worn or cracked factory carbon-ceramic parts. This StopFlex kit pairs a 405mm front carbon-ceramic rotor with Brembo V6 / GT6 / GTS6 6-piston front caliper options and a 380mm rear carbon-ceramic rotor with a TTSPORT EP4 4-piston EPB rear caliper, so heat capacity, dust reduction, and rear parking-brake function are addressed together. Each kit is engineered after the exact G20, G21, G80, or G81 trim is confirmed, because standard 3 Series and M3 variants can differ in uprights, hub geometry, rotor offsets, and wheel clearance.
- 405mm is the largest rotor in this kit, so 21-inch wheels are the minimum requirement; wheels under 21 inches will not clear, and spoke clearance must still be checked.
- Front choices are 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, each paired with a 405mm carbon-ceramic rotor.
- The rear uses a TTSPORT EP4 4-piston EPB caliper on a 380mm carbon-ceramic rotor, keeping the electronic parking brake layout required by modern G20/G21/G80/G81 BMW rear brake systems.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | BMW 3 Series / M3 (G20/G21/G80/G81) |
| Model years | 2019-2026+ |
| Front setup | Brembo V6 / GT6 / GTS6 6-Piston Caliper Options / 405mm |
| Rear setup | TTSPORT EP4 4-Piston Caliper with EPB / 380mm |
| Page type | Complete CCB kit upgrade |
| Minimum wheel size | 21" (for the 405 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 405 mm front rotor, so the minimum wheel size is 21". Wheels under 21" 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 is built around Brembo V6 / GT6 / GTS6 6-Piston Caliper Options, giving the buyer a choice among three 405mm front configurations: 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. A 6-piston fixed caliper distributes clamping load across the pad for controlled pedal response and more even pressure on the 405mm carbon-ceramic disc. The Brembo OEM-derived and Brembo GT-family options are credible choices for this chassis because they are real performance calipers, not cosmetic covers or generic cast replacements.
Rear Caliper (Balance)
The rear axle uses the TTSPORT EP4 4-Piston Caliper with EPB on a 380mm carbon-ceramic rotor, adding rear thermal capacity while preserving electronic parking-brake function. Its 4 hydraulic service pistons support rear braking stability instead of leaving the rear axle as an under-braked visual match.
Front & rear, engineered together: This kit is engineered as a front-and-rear system so the 405mm Brembo 6-piston front package and 380mm TTSPORT EP4 rear package are matched for the confirmed BMW trim instead of combining a large front brake with an unchanged rear setup. The EP4 design uses 4 hydraulic service pistons plus 1 dedicated EPB actuator piston, so the car keeps OE-style parking-brake convenience while gaining rear-axle heat capacity.
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 | 405mm |
| 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 | V6 = Genuine Brembo OEM Cadillac CTS-V 6-Piston Caliper — 405 mm rotor GT6 = Genuine Brembo GT | M6 6-Piston Caliper — 405 mm rotor GTS6 = Genuine Brembo GT | S6 6-Piston Caliper — 405 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. |
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 confirmed per exact trim before production. A standard G20/G21 3 Series and a G80/G81 M3 can share a family name but use different uprights, hubs, offsets, and wheel clearance, so StopFlex matches brackets, rotor hats, and caliper mounting to the specific car rather than assuming platform-wide fit.
What wheel size do I need for the 405mm front rotor?
The 405mm front rotor requires 21-inch wheels minimum. Wheels smaller than 21 inches will not clear the rotor, and final approval also depends on spoke shape, barrel profile, offset, and caliper face clearance.
Will the electronic parking brake still work?
Yes. The rear package uses the TTSPORT EP4 4-Piston Caliper with EPB, which has 4 hydraulic service pistons for braking and a dedicated EPB actuator piston for parking-brake function, so the BMW electronic parking brake layout is retained.
Why choose this over factory iron brakes or replacement OEM carbon ceramics?
Compared with iron brakes, the carbon-ceramic rotors reduce brake dust and target repeated-stop heat control while lowering rotating and unsprung mass. Compared with replacing OEM carbon-ceramic parts at dealer pricing, this bespoke StopFlex kit supplies calipers, carbon-ceramic rotors, pads, hats, hardware, and lines as one engineered package for the confirmed BMW trim.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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