2012-2018 Ford Focus RS 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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2012-2018 Ford Focus RS / ST CCB Big Brake Kit — Genuine Brembo GT6 Front + Genuine Brembo GT4 Rear Setup
The 2012-2018 Focus ST and 2016-2018 Focus RS put repeated heat into the front brakes on track days, canyon use, and high-speed street driving, especially when sticky tires and added power increase braking load. This StopFlex kit replaces the factory iron setup with 355mm front and 330mm rear carbon-ceramic rotors, genuine Brembo 6-piston front and 4-piston rear caliper options, matched hats, pads, lines, brackets, and hardware. The payoff is higher thermal margin, lower brake dust, reduced rotating mass, and fitment engineered around the buyer’s exact RS or ST trim rather than assumed from the Focus chassis name.
- 355mm is the largest rotor in this Focus RS/ST kit, so 18-inch wheels are the minimum; spoke profile and wheel offset still must be checked before production.
- Front choices are V6, GT6, or GTS6 6-piston Brembo calipers on 355mm carbon-ceramic rotors, matched to the Focus RS or ST knuckle and hat offset after trim confirmation.
- Rear choices are V4, GT4, or GTS4 4-piston Brembo calipers on 330mm carbon-ceramic rotors to keep rear contribution matched to the larger front brake package.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Ford Focus RS / ST |
| Model years | 2012-2018 |
| Front setup | Brembo V6 / GT6 / GTS6 6-Piston Caliper Options / 355mm |
| Rear setup | Brembo V4 / GT4 / GTS4 4-Piston Caliper Options / 330mm |
| Page type | Complete CCB kit upgrade |
| Minimum wheel size | 18" (for the 355 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 355 mm front rotor, so the minimum wheel size is 18". Wheels under 18" 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 Brembo V6 / GT6 / GTS6 6-Piston Caliper Options, giving the Focus RS/ST a six-piston layout for stronger clamp distribution across the pad and a firmer, more controlled pedal under repeated heat cycles. The buyer chooses V6 = Genuine Brembo OEM Cadillac CTS-V 6-Piston Caliper with a 355mm rotor, GT6 = Genuine Brembo GT | M6 6-Piston Caliper with a 355mm rotor, or GTS6 = Genuine Brembo GT | S6 6-Piston Caliper with a 355mm rotor. Each option is a genuine Brembo aluminum performance caliper package, paired here with StopFlex carbon-ceramic rotors, hats, pads, brackets, hardware, and lines for the confirmed Focus trim.
Rear Caliper (Balance)
The rear upgrade uses Brembo V4 / GT4 / GTS4 4-Piston Caliper Options on 330mm carbon-ceramic rotors to add rear thermal capacity and stabilize the car under trail braking and high-speed deceleration. Because this Focus RS/ST generation uses a manual cable parking brake rather than an EPB, there is no electronic parking-brake motor to retain or code.
Front & rear, engineered together: StopFlex engineers the 355mm front and 330mm rear package together so caliper piston layout, rotor diameter, hat offset, and bracket geometry work as a system instead of adding rear hardware around a mismatched front-only conversion. That matters on a short-wheelbase, high-grip Focus RS/ST because rear brake contribution affects stability, ABS behavior, and pedal consistency.
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 | 355mm |
| Rear calipers | Brembo V4 / GT4 / GTS4 4-Piston Caliper Options |
| Rear CCB rotors | 330mm |
| 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 — 355 mm rotor GT6 = Genuine Brembo GT | M6 6-Piston Caliper — 355 mm rotor GTS6 = Genuine Brembo GT | S6 6-Piston Caliper — 355 mm rotor |
| Rear caliper option mapping | V4 = Genuine Brembo OEM Cadillac CTS-V 4-Piston Caliper — 330 mm rotor GT4 = Genuine Brembo GT | M4 4-Piston Caliper — 330 mm rotor GTS4 = Genuine Brembo GT | S4 4-Piston Caliper — 330 mm rotor |
FAQ
Will this kit fit my exact Focus RS or ST?
Fitment is confirmed against your exact year, market, trim, hub/upright package, and wheel data before the kit is built. StopFlex does not treat the Focus RS and ST as one generic platform because knuckle geometry, hat offset, and wheel clearance can differ by trim and market.
What wheel size do I need for the 355mm front rotor?
The 355mm front rotor requires at least an 18-inch wheel. Barrel clearance, spoke shape, offset, and spacer use still need to be checked because a wheel can be 18 inches and still interfere with the Brembo 6-piston caliper face.
Does this Focus RS/ST kit retain the parking brake?
This generation Focus RS/ST uses a manual cable parking brake, not an EPB system. Rear parking-brake compatibility is handled during the bespoke rear package specification, but there is no factory electronic parking-brake motor to preserve.
Why switch from iron rotors to carbon ceramic on this car?
Carbon-ceramic rotors reduce brake dust, cut rotating and unsprung mass versus comparable iron hardware, and hold a wider thermal margin during repeated hard stops. On a Focus RS or ST used with performance tires, that helps pedal consistency and steering response while keeping the 355mm/330mm brake package visually and thermally matched.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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