2023-2026+ BMW XM (G09) CCB Big Brake Kit | Akebono 10N 10-Piston
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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2023-2026+ BMW XM (G09) CCB Big Brake Kit — Genuine Akebono OEM Porsche 10-Piston (10N) Caliper Front + Genuine Brembo OEM Porsche 19Z 4-Piston Caliper Rear Setup
The BMW XM G09 is a heavy plug-in hybrid M SUV, so repeated high-speed stops put real heat into the factory brake system and make rotor mass, brake dust, and pedal consistency noticeable. This StopFlex kit pairs a 420mm front carbon-ceramic rotor with the Genuine Akebono OEM Porsche 10-Piston (10N) Caliper and a 380mm rear carbon-ceramic rotor with the Genuine Brembo OEM Porsche 19Z 4-Piston Caliper. Each kit is built around the customer’s exact XM trim, wheel package, hub geometry, bracket position, rotor-hat offset, and caliper clearance rather than assuming one G09 layout fits every vehicle.
- 420mm front and 380mm rear carbon-ceramic rotors give the G09 XM more thermal capacity than a front-only cosmetic caliper swap.
- The front axle uses the exact Genuine Akebono OEM Porsche 10-Piston (10N) Caliper, selected for broad pad support and stable pressure distribution across the large front rotor.
- The 420mm front rotor requires 21-inch or larger wheels; factory 21-, 22-, and 23-inch XM wheel packages still require spoke-clearance verification.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | BMW XM (G09) |
| Model years | 2023-2026+ |
| Front setup | Genuine Akebono OEM Porsche 10-Piston (10N) Caliper / 420mm |
| Rear setup | Genuine Brembo OEM Porsche 19Z 4-Piston Caliper / 380mm |
| Page type | Complete CCB kit upgrade |
| Minimum wheel size | 21" (for the 420 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 420 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 uses the Genuine Akebono OEM Porsche 10-Piston (10N) Caliper with a 420mm carbon-ceramic rotor. Its 10-piston layout spreads clamping load across a larger pad area, which supports pedal stability and even friction use on a high-mass XM. Because it is a genuine OEM-derived Porsche caliper rather than a generic aftermarket casting, the upgrade is built around known production brake architecture, proven serviceability, and StopFlex vehicle-specific mounting hardware.
Rear Caliper (Balance)
The rear axle uses the Genuine Brembo OEM Porsche 19Z 4-Piston Caliper with a 380mm carbon-ceramic rotor to keep rear brake contribution proportional to the front upgrade. Rear fitment is engineered to retain factory electronic parking brake operation where the vehicle’s EPB hardware and final configuration allow it.
Front & rear, engineered together: The 420mm front and 380mm rear package is engineered as a complete brake system so the XM does not gain front clamp and heat capacity while leaving rear bias, pedal travel, and stability behind. StopFlex matches brackets, rotor hats, lines, pads, and hardware to the confirmed trim so the front and rear upgrades work as one system.
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 Akebono OEM Porsche 10-Piston (10N) Caliper |
| Front CCB rotors | 420mm |
| Rear calipers | Genuine Brembo OEM Porsche 19Z 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 2023-2026+ BMW XM G09?
Fitment is confirmed against your exact year, trim, and wheel package before production. The brackets, rotor-hat offsets, caliper mounting, and line routing are built for that confirmed XM configuration, not assumed from the G09 chassis name alone.
What wheel size do I need for the 420mm front rotor?
The 420mm front rotor requires 21-inch or larger wheels. Factory 21-, 22-, and 23-inch XM wheels can be candidates, but spoke shape, offset, and inner barrel clearance must still be checked before the kit is finalized.
Will the electronic parking brake and Auto Hold still work?
The BMW XM G09 has a factory electronic parking brake, so the rear package is specified with EPB retention in mind. StopFlex confirms the rear caliper layout and parking-brake interface during the vehicle-specific fitment review.
Why choose carbon-ceramic rotors on an XM instead of another iron big-brake kit?
Carbon-ceramic rotors reduce rotating and unsprung mass compared with same-size iron rotors, produce very low brake dust with the correct pads, and handle repeated heat cycles with more consistent friction. On a heavy plug-in hybrid M SUV, those gains show up as cleaner wheels, less heat soak, and more stable braking during fast road or track use.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
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