2014-2025 Lexus IS (XE30) CCB Big Brake Kit | Brembo GT350 6-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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2014-2025 Lexus IS (XE30) CCB Big Brake Kit — Genuine Brembo OEM Ford Shelby GT350 Mustang 6-Piston Caliper Front + TTSPORT EP4 4-Piston Caliper with EPB Rear Setup
The XE30 Lexus IS owner shopping this kit is usually trying to solve repeated iron-rotor heat stress, heavy brake dust, and soft pedal feel after aggressive street or track use. This StopFlex upgrade pairs a 390 mm front carbon-ceramic rotor with the Genuine Brembo OEM Ford Shelby GT350 Mustang 6-Piston Caliper, then matches it to a 380 mm rear carbon-ceramic package using the TTSPORT EP4 4-Piston Caliper with EPB where the car is equipped for it. Each kit is built around the buyer’s confirmed IS year, trim, drivetrain, and wheel package so the hats, brackets, and mounting geometry match the specific car instead of a generic XE30 assumption.
- 390 mm front and 380 mm rear carbon-ceramic rotors give the XE30 IS more thermal headroom than a factory-size iron brake package while reducing brake dust on open-spoke wheels.
- The front axle uses the exact Genuine Brembo OEM Ford Shelby GT350 Mustang 6-Piston Caliper, selected for high clamp stability and a firm pedal under repeated high-speed stops.
- The 390 mm front rotor requires 20 inch or larger wheels; spoke profile and wheel offset still must be checked against the GT350 Brembo caliper template before production.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | Lexus IS (XE30) |
| Model years | 2014-2025 |
| Front setup | Genuine Brembo OEM Ford Shelby GT350 Mustang 6-Piston Caliper / 390mm |
| Rear setup | TTSPORT EP4 4-Piston Caliper with EPB / 380mm |
| 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 upgrade uses the Genuine Brembo OEM Ford Shelby GT350 Mustang 6-Piston Caliper, a production OEM Brembo performance caliper designed around high-load front-axle braking. Its six-piston layout spreads pad pressure across a larger swept area than a small factory sliding caliper, helping the 390 mm carbon-ceramic rotor deliver stable clamping force and a more consistent pedal during repeated stops. StopFlex mounts this caliper with IS-specific brackets and rotor-hat offsets based on the customer’s confirmed trim and wheel data.
Rear Caliper (Balance)
The rear package uses the TTSPORT EP4 4-Piston Caliper with EPB on a 380 mm carbon-ceramic rotor to add rear-axle thermal capacity without treating the rear brakes as cosmetic fill. Its four hydraulic service pistons support brake-bias stability, and its dedicated EPB actuator preserves electronic parking-brake function on XE30 IS trims equipped with factory EPB.
Front & rear, engineered together: This kit is engineered as a front-and-rear system so the large 390 mm front rotor and 380 mm rear rotor work with matched caliper mounting, rotor offsets, and line routing. Pairing the GT350 Brembo front caliper with an EPB-capable TTSPORT rear caliper avoids the common front-only problem of adding front torque and heat capacity while leaving the rear axle undersized for repeated braking.
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 Ford Shelby GT350 Mustang 6-Piston Caliper |
| Front CCB rotors | 390mm |
| 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. |
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 every 2014-2025 Lexus IS XE30?
No platform-wide fitment is assumed. StopFlex confirms the exact IS year, trim, drivetrain, hub/knuckle details, wheel size, wheel offset, and spoke clearance before machining the brackets and rotor hats for that car.
What wheel size is required for the 390 mm front rotor?
The 390 mm front carbon-ceramic rotor requires 20 inch or larger wheels. Diameter alone is not enough; the Genuine Brembo OEM Ford Shelby GT350 Mustang 6-Piston Caliper also needs spoke-clearance verification before the kit is built.
Will the electronic parking brake still work?
On 2021-2025 XE30 IS trims equipped with factory EPB, the TTSPORT EP4 rear caliper keeps EPB function by using four hydraulic service pistons plus a dedicated EPB actuator piston. Earlier foot-pedal parking-brake cars require separate confirmation because their parking-brake architecture is different.
Why choose carbon-ceramic rotors instead of another iron big brake kit?
Carbon-ceramic rotors are chosen to reduce rotating mass, cut visible brake dust, and improve heat stability during repeated high-energy stops. On this Lexus IS package, the payoff is tied to the 390 mm front and 380 mm rear rotor sizing, not just the material change.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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