BMW X4M / Competition (F98) Carbon Ceramic Brakes Kit
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
2019-2024 BMW X4M / Competition (F98) Carbon Ceramic Brake Kits
The F98 X4M / Competition is a heavy, very fast S58 coupe-SUV that sees a lot of aggressive street driving and occasional track use. Buyers usually want stronger repeat-stop confidence with less dust and rotor wear than the stock 395/370 iron setup.
- Body style: SUV Coupe
- Front rotor reference: X4M: 395mm
- Rear rotor reference: X4M: 370mm
This is an OEM-size replacement kit. The rotors are built to the factory rotor spec and install with the factory caliper when the front caliper is a fixed design and the rotor spec matches. The included pad shape matches the OEM pad shape. If the car uses aftermarket calipers such as Brembo, AP Racing, Alcon, or Wilwood, provide the exact caliper model and StopFlex can supply the matching pad shape. Direct replacement is not confirmed if the front caliper is floating, or if the car already runs a non-OEM-offset rotor and the actual rotor dimensions cannot be supplied.
Why StopFlex CCB
Lightweight
Half the Weight, Sharper Handling. StopFlex carbon-ceramic rotors shed roughly half the mass of equivalent iron discs. This massive drop in unsprung weight instantly transforms your chassis, delivering sharper turn-in response and a significantly more refined road feel.
High-Temp Resistance
Minimal Brake Fade at 900°C (1652°F). While traditional iron rotors severely fade under heavy track loads, our CCB matrix holds a stable 0.30μ friction coefficient even at 900°C (1652°F). You get consistent, predictable stopping power when things get dangerously hot.
Corrosion Resistance
100% Rust-Free Durability. Say goodbye to flash rust after a car wash or heavy rain. The carbon-silicon carbide material is naturally impervious to corrosion, ensuring your brake rotors look completely clean and pristine no matter the weather conditions.
Long Lifespan
250,000+ km (155,000+ mi) Lifespan. Iron rotors typically require replacement around 100,000 km (62,000 mi). In normal street driving conditions, a StopFlex CCB rotor can easily last 250,000 to 300,000 km (155,000 to 186,000 mi), effectively outlasting the vehicle itself.
Ultra-Low Dust
Ultra-Low Visible Brake Dust. Heavy black dust destroying your wheel finish is a thing of the past. When paired with our matched StopFlex pads, these rotors generate virtually zero visible brake dust, keeping your premium wheels spotless for much longer.
Premium Visual Finish
Premium Mirror-Like Finish. StopFlex utilizes a patented ceramic formula that cures with a distinct crackle pattern. The surface is machined dead-smooth for high reflectivity, providing a premium aesthetic behind open wheels under the right lighting.
High Normal-Temp Friction
Strong Initial Bite (0.40μ+). With matched StopFlex pads, normal-temperature friction can exceed 0.40μ for a firmer pedal feel and strong initial bite.
Long-Fiber Construction
Continuous Long-Fiber Strength. StopFlex utilizes a continuous long-fiber 3D matrix. This structure is significantly stronger and offers higher thermal conductivity than standard chopped-fiber OEM CCM discs.
Cold First-Stop Confidence
Reliable Cold-Bite at -20°C (-4°F). Coated street rotors still deliver normal first-stop braking at -20°C (-4°F). Uncoated motorsport rotors are the exception.
Important heat note
Carbon ceramic does not shed heat as fast as steel. Long hard driving can heat-soak the rest of the brake system, including fluid, seals, and nearby parts. Unless the car already has strong brake cooling, or you plan to upgrade brake cooling, prolonged aggressive driving is not recommended.
Rotor options
Street Spec
Ceramic coating + cross-drilled face + large cooling channels.
Street-focused F98 builds usually suit the smallest StopFlex carbon ceramic option that clears your wheels and matches your calipers.
Track-Day Spec
Ceramic coating + blank face + honeycomb cooling channels.
For mixed street and trackday use, choose the next size up to add heat capacity and keep pedal consistency in a heavy X4M.
Motorsport Spec
No coating + blank face + honeycomb cooling channels. Not for normal street use.
For repeated hard sessions or high-power builds, use the largest proven front-biased StopFlex setup your wheel package supports.
Pads
| Item | Details |
|---|---|
| Pad shape | The included StopFlex pad shape matches the OEM pad shape used by the retained caliper. |
| Aftermarket calipers | Provide the exact caliper model and StopFlex can supply the matching pad shape. |
| Pad details | For compound details and pad-specific parameters, see the StopFlex Ceramic Brake Pad for CCB Rotor product page. |
What’s included
| Item | Included |
|---|---|
| CCB rotors | Full-car set |
| CCB brake pads | Full-car set |
| 7075 aluminum floating rotor hats | Full-car set |
| Stainless floating hardware | Full-car set |
| Order scope | Default listing includes front set + rear set. Front-only or rear-only can be ordered separately. |
FAQ
Can I upgrade my BMW X4M / Competition (F98) to a StopFlex carbon ceramic brake kit while keeping the factory calipers, or do I need aftermarket calipers?
That depends on the exact StopFlex kit version for the F98 and the caliper mount pattern it is built around. If you want to keep the factory X4M calipers, confirm the kit is explicitly designed for the OE front and rear calipers before ordering.
What is the correct StopFlex carbon ceramic size choice for my BMW X4M / Competition (F98) with the stock 395mm front and 370mm rear brakes?
Use the stock 395mm front and 370mm rear dimensions as your starting reference for this chassis. If your X4M is mostly street-driven, stay close to stock-equivalent sizing; if it sees repeated hard use, step up only if wheel clearance and caliper compatibility are confirmed.
Is a StopFlex carbon ceramic brake kit a good daily-driver upgrade for the BMW X4M / Competition (F98), including cold first stops?
For a daily-driven F98, the key question is pad and system tuning, not just rotor material. If StopFlex offers a street-biased setup for the X4M, it can make sense, but buyers sensitive to cold bite should ask specifically about first-stop behavior before ordering.
Will a StopFlex carbon ceramic brake kit on the BMW X4M / Competition (F98) handle prolonged hard driving, or do I also need brake cooling upgrades?
A carbon ceramic kit adds thermal margin, but the X4M is still a heavy, fast SUV that can stress brakes on long downhill or track sessions. For repeated hard use, it is smart to pair the brake upgrade with good pads, fluid, and airflow management rather than expecting the rotors alone to solve heat.
Need fitment confirmation?
Send the exact vehicle details and current brake setup before ordering.
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