BMW Z4 M40i (G29) Carbon Ceramic Brakes Kit
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
2019-2026 BMW Z4 M40i (G29) Carbon Ceramic Brake Kits
The G29 Z4 M40i is a light, rear-drive roadster that mixes B58 straight-line pace with open-top street use more than full-time track duty. Buyers upgrading brakes usually want sharper pedal feel, cleaner wheel presentation, and more heat margin without upsetting daily drivability.
- Body style: Roadster
- Front rotor reference: Z4 M40i: 348mm
- Rear rotor reference: Z4 M40i: 345mm
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: stay near the listed 348mm/345mm footprint if you want the most straightforward daily-driver balance for this Z4 M40i.
Track-Day Spec
Ceramic coating + blank face + honeycomb cooling channels.
Trackday: a larger front-focused setup makes the most sense if your G29 sees repeated hard downhill or track braking.
Motorsport Spec
No coating + blank face + honeycomb cooling channels. Not for normal street use.
Motorsport: choose the most heat-capable front and rear package only if the car is consistently used for prolonged hard sessions.
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 Z4 M40i (G29) 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 configuration for the G29 and your current M Sport brake hardware. Because G29 owners also retrofit other BMW big-brake parts, confirm caliper mount pattern, hat offset, and parking-brake compatibility before ordering.
What is the correct StopFlex carbon ceramic brake size for my BMW Z4 M40i (G29) with the listed 348mm front and 345mm rear brakes?
For this vehicle row, the safe starting point is a kit built around the listed 348mm front and 345mm rear dimensions. Move to a larger setup only if you have verified wheel clearance and you truly need more front heat capacity for hard use.
Is a StopFlex carbon ceramic brake kit a good daily-driver upgrade for the BMW Z4 M40i (G29), including cold first stops and normal street use?
Yes, if your priority is a cleaner, lighter-feeling roadster with stronger consistency than the stock iron setup. Daily drivers should still choose the most street-biased StopFlex setup, since G29 use is often road-focused rather than full track duty.
Will my BMW Z4 M40i (G29) need extra cooling or other changes when upgrading to a StopFlex carbon ceramic brake kit for repeated hard driving?
For spirited street use, usually no major cooling changes are the first priority. For repeated high-speed or track braking, the smarter approach is to pair the kit with proper pads, fluid, and airflow management because G29 owners report stock-brake heat limits under harder use.
Need fitment confirmation?
Send the exact vehicle details and current brake setup before ordering.
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