2019-2026+ BMW M135i (F40/F70) Carbon Ceramic Brake Rotors
Official Warranty: 1‑year free replacement for quality defects or coating issues under normal (non-track) use.
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Will This Fit My Car?
Direct Replacement CCB Discs (Retain Factory Calipers) for the 2019-2026+ BMW M135i (F40/F70). Factory rotor specifications and the smallest wheel that clears each trim:
| Trim | Front Rotor (Factory) | Rear Rotor (Factory) | Min. Wheel Size |
|---|---|---|---|
| M135i | 360mm | 330mm | 19" |
Keep Your Factory Calipers?
Keep them if the front calipers are fixed 4-piston or more — the rear axle qualifies regardless. Front 1- or 2-piston floating calipers rule out the disc-only route; choose the Full Upgrade kit instead. Every set is machined to the factory rotor specs listed above, and aftermarket calipers (Brembo, AP Racing, Alcon, Wilwood) only need the caliper model, pad shape, and rotor dimensions confirmed before we build.
Spoke profile and offset also affect clearance — confirm your exact wheels before ordering.
What's in the Box
| Item | Details |
|---|---|
| Product type | Direct Replacement CCB Discs (Retain Factory Calipers) |
| CCB rotors | Full-car set by default, built to the factory rotor specification |
| CCB brake pads | Matched ceramic-compatible compound for StopFlex carbon ceramic rotors |
| 7075 aluminum floating rotor hats | Vehicle-specific fitment; custom rotor hat colors available for every Direct Replacement order. |
| Stainless floating hardware | Full-car hardware set |
| Order scope | Default listing is full-car set. Front-only or rear-only orders can be arranged after confirmation. |
Why Carbon Ceramic — and Why StopFlex
CCB-Specific Pad Compound
A low-metallic resin pad compound reinforced with steel, copper, and aramid fiber, made for ceramic discs: stable to about 750 °C, roughly 0.44 average friction, strong fade resistance, low rotor wear.
Lower Unsprung Mass
A carbon-ceramic rotor weighs roughly half of the equivalent iron disc. Less rotating, unsprung mass lets the suspension follow broken pavement more cleanly and makes steering response noticeably sharper.
High-Temperature Stability
The carbon-silicon-carbide friction matrix keeps working at temperatures that push iron rotors into heavy fade, so the tenth hard stop feels like the first — same pedal travel, same bite point.
Rust-Free Rotor Surface
Ceramic discs cannot flash-rust. After rain, a wash, or weeks of parking, the rotor face behind your open-spoke wheels stays clean — no orange ring on a freshly detailed car.
Long Street-Service Life
In normal road use with matched pads and correct bedding, one StopFlex CCB rotor set is engineered to outlast several sets of iron replacement rotors, recovering part of the up-front cost.
Low Visible Dust
Matched with StopFlex pads, the system sheds a fraction of the dust an iron rotor and pad combination throws. Wheels stay clean for weeks of driving instead of days.
Premium Ceramic-Glaze Finish
StopFlex's proprietary coating gives the disc a bright ceramic-glaze surface with subtle texture — the factory carbon-ceramic look, clearly visible through open wheel designs.
Continuous Fiber Construction
StopFlex discs are built with long continuous carbon fiber instead of chopped short fiber. Continuous strands carry load across the whole rotor body, raising strength and thermal durability under heat cycles.
Bespoke Per-Vehicle Engineering
Every order is machined to the confirmed vehicle and trim. Brackets, hat offsets, and pad shapes are built for that exact car — never pulled from a one-size-fits-all catalog.
Winter & Cold-Weather Braking
A cold, untuned carbon-ceramic disc needs more pedal than iron on the first winter stops — normal material physics. StopFlex engineered the pad formula and disc coating specifically for cold starts, closing that gap: cold-car winter feel is now very close to summer feel. Keep a little extra distance on the coldest mornings; for harsh winters, choose Street Spec.
Choose Your Rotor: Street, Track-Day, or Motorsport
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.
Heat Management Note
Ceramic discs shrug off surface temperatures that would destroy iron, but the rest of the system still heats up: pads, fluid, seals, calipers, and wheels all absorb soak heat during repeated hard stops. For track days, long descents, and sustained hard driving, run brake cooling and high-temperature fluid.
Get Your Fitment Confirmed
Send the exact vehicle details, current rotor sizes, and caliper type before ordering. Every StopFlex order is confirmed against your VIN-level configuration before production.
FAQ
Does this fit my exact M135i, and will it clear my wheels?
This kit is built for the F40/F70 M135i running the factory 360mm front and 330mm rear rotor sizes with the OEM 4-piston front Brembo caliper. Direct Replacement is only valid because that front caliper is a 4-piston unit; the rear is unrestricted. It reuses your factory calipers with carbon-ceramic rotors, hats, and floating hardware. Because rotor diameter is unchanged at 360mm front, your current 18-inch or larger wheels that already clear the stock brake will clear these. Confirm your trim and rotor size before ordering—fitment is limited to the M135i sizes listed here.
How do these behave in winter and on cold first stops?
Physics first: any cold carbon-ceramic disc bites a little less than cold iron until it warms, which is normal and not a defect. We addressed this directly on the M135i kit by tuning both the pad compound and the disc's ceramic coating for cold starts, so a cold-car first stop in winter now feels very close to a warm summer stop. On the coldest mornings, leave a little extra following distance for the first one or two stops while everything comes up to temperature, then the bite is consistent.
Will the electronic parking brake still work with the rear rotors?
Yes. The M135i uses an electronic parking brake acting on the rear caliper, and this kit reuses those factory rear calipers on the matched 330mm carbon-ceramic rear rotor. The EPB motor and actuation are untouched, so parking-brake function, hold, and auto-hold behave exactly as they did from the factory.
What's the real benefit over the stock iron rotors on this car?
The M135i front brake carries a heavy iron rotor at each corner; swapping to carbon-ceramic drops a significant chunk of unsprung and rotating mass at the 360mm front, which sharpens turn-in and ride response on this short-wheelbase xDrive hatch. You also get far higher fade resistance for repeated hard stops and track sessions, and the low-metallic pad produces far less of the black dust that coats M135i wheels. The paired pad runs about a 0.44 friction coefficient with heat resistance to roughly 750 °C.
More Contact Information
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