2019-2026+ BMW Z4 M40i (G29) Carbon Ceramic Brake 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 Kit — OEM-Size Replacement
The G29 Z4 M40i is light enough to make brake feel obvious and quick enough to overheat street iron rotors during repeated canyon or track braking. This StopFlex OEM-size replacement kit keeps the Z4 M40i’s 348mm front and 345mm rear brake layout while replacing the iron friction rings with carbon-ceramic rotors, matched pads, hats, and floating hardware. The result is lower rotating mass, less visible dust on open BMW wheels, and more stable high-temperature friction without changing the car’s basic brake architecture.
- Built around the Z4 M40i G29 rotor references: 348mm front and 345mm rear, not the smaller non-M40i brake package.
- Floating hats and hardware let the carbon-ceramic rings expand under heat while retaining the OEM-size position inside the factory caliper envelope.
- Designed for M40i owners replacing heat-checked or dusty iron rotors while keeping the stock hydraulic system, rear parking-brake function, and wheel fitment checks tied to the factory rotor size.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | BMW Z4 M40i (G29) |
| Model years | 2019-2026+ |
| Front rotor reference | Z4 M40i: 348mm |
| Rear rotor reference | Z4 M40i: 345mm |
| Page type | OEM-size carbon ceramic replacement |
| Minimum wheel size | 18" (for the 348 mm rotor) |
For OEM replacement orders, StopFlex builds around the factory rotor specification shown for this vehicle. Front floating-caliper setups require manual review before production. If the car uses aftermarket calipers such as Brembo, AP Racing, Alcon, or Wilwood, the order can still be built, but the exact caliper model, pad shape, and rotor dimensions must be confirmed before production.
This setup uses a 348 mm 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.
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.
Custom Rotor Hat Color
Every StopFlex OEM replacement order can be built with a custom rotor hat color, giving the carbon ceramic rotor package a cleaner match with the wheel, body color, and overall build style.
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 |
|---|---|
| CCB rotors | Full-car set by default |
| CCB brake pads | Matched for StopFlex carbon ceramic rotors |
| 7075 aluminum floating rotor hats | Vehicle-specific fitment |
| Stainless floating hardware | Full-car hardware set |
| Rotor hat color | Custom rotor hat colors are available for every OEM replacement order. |
| Order scope | Default listing is full-car set. Front-only or rear-only orders can be arranged after confirmation. |
FAQ
Will this kit fit every 2019-2026+ BMW Z4 G29?
No. This page is for the Z4 M40i G29 brake package using 348mm front rotors and 345mm rear rotors. Do not order it for a G29 sDrive30i or any car with a different rotor diameter or caliper package without confirming measurements first.
Does the rear electronic parking brake and auto-hold function still work?
Yes, the kit is configured as an OEM-size replacement for the Z4 M40i rear brake layout, so the rear parking-brake hardware and BMW auto-hold control strategy are retained when installed correctly with the matching rear components.
Why switch a Z4 M40i from iron rotors to carbon ceramic?
Carbon-ceramic rotors reduce rotating and unsprung mass, produce much less dark brake dust, and tolerate repeated high-temperature braking better than conventional iron rings. On the short-wheelbase G29 roadster, that weight reduction is most noticeable in steering response and suspension control over rough pavement.
What should I confirm before ordering?
Confirm the car is a 2019-2026+ BMW Z4 M40i G29, measure or verify 348mm front and 345mm rear rotor sizes, check that the calipers are the M40i package, and confirm wheel barrel clearance if the car has aftermarket wheels or spacers.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
More Contact Information
We’re here to help! Whether you need expert advice on brake setups, have questions about your order, or just want to share feedback, our team is ready to assist you. Reach out via your preferred channel below, or use the inquiry form.
Get in Touch
Business Hours
Monday – Saturday, 9:30 AM – 6:30 PM (GMT +8)
Current Time:
Follow Us
- Choosing a selection results in a full page refresh.