2012-2019 BMW M140i / M135i (F20/F21) Carbon Ceramic Brake Kit
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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2012-2019 BMW M140i / M135i (F20/F21) Carbon Ceramic Brake Kit — OEM-Size Replacement
The F20/F21 M135i and M140i are hard on front brakes when the 340 mm M Sport package is used repeatedly on fast road or track, and iron rotors leave heavy dust on the open factory wheels. This StopFlex OEM-size carbon-ceramic kit replaces the listed 340 mm or 370 mm front and 345 mm rear rotor setup with carbon-ceramic rotors, matched pads, hats, and floating hardware. The payoff is higher thermal stability under repeated stops, lower brake dust, and reduced rotating unsprung mass without converting away from the listed M135i/M140i rotor sizes.
- Built only for 2012-2019 BMW M135i/M140i F20/F21 applications using the listed 340 mm or 370 mm front rotor and 345 mm rear rotor configuration.
- Includes carbon-ceramic rotors, matched pads, hats, and floating hardware so the kit replaces the OEM-size disc package rather than requiring a big-brake conversion.
- Targets the common F20/F21 M135i/M140i use case: repeated high-speed braking where iron discs generate heat fade, pad transfer, and heavy wheel dust.
Fitment Hard Lines
| Field | Specification |
|---|---|
| Vehicle | BMW M140i / M135i (F20/F21) |
| Model years | 2012-2019 |
| Front rotor reference | M140i/M135i: 340mm, 370mm |
| Rear rotor reference | M140i/M135i: 345mm |
| Page type | OEM-size carbon ceramic replacement |
| Minimum wheel size | 15" (for the 140 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 140 mm rotor, so the minimum wheel size is 15". Wheels under 15" 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 fit my 2012-2019 BMW M135i or M140i F20/F21?
It fits only the F20/F21 M135i and M140i trims covered by this page and only when your current brake package matches the listed rotor sizes: 340 mm or 370 mm front and 345 mm rear. Confirm your front rotor diameter before ordering because BMW performance brake packages can vary.
Do I need different calipers or brackets?
No big-brake conversion is intended for this OEM replacement page. The StopFlex kit is built around the listed M135i/M140i rotor diameters and includes the carbon-ceramic rotors, pads, hats, and floating hardware needed for that replacement package.
Will the parking brake still work?
Yes, the kit is designed around the rear 345 mm M135i/M140i brake package and does not delete the factory parking-brake function. Verify rear rotor size and parking-brake hardware condition during installation.
Why switch from iron rotors on an F20/F21 M135i or M140i?
Carbon-ceramic rotors reduce brake dust, resist heat-related fade better during repeated stops, and remove rotating unsprung mass compared with iron discs. That matters on the short-wheelbase F20/F21 chassis because front-end response and brake consistency are noticeable during fast road and track use.
Need Fitment Confirmation?
Send the exact vehicle details, current rotor sizes, and caliper type before ordering.
More Contact Information
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