Teamspeed.com - :: ECS Tuning :: E46 M3 ECS 2-Piece Brake Rotors|Reduce weight. Reduce heat.

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Ready for something new that'll stop you dead in your tracks? Say hey to our new ECS 2-Piece brake rotors. These great looking semi-floating rotors combine the braking efficiency of cast iron with the weight savings and rapid heat dissipation of aluminum. Lighter, two-piece construction reduces unsprung weight and rotational inertia. That ain't all, folks. Drilling and slotting let brakes run cleaner and cooler. Precision ground faces with non-directional finish run true, and bed pads easily.

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Aluminum hats: To save weight, each rotor ring is bolted to a lightweight aluminum hat made from high quality 6061 aluminum, and hard anodized with an attractive matte black finish that is both durable and corrosion resistant.
Gray cast iron rings: Long known for its wear resistance and stable friction characteristics, cast iron is favored for brake rotors due to its ability to absorb and dissipate large amounts of heat.
2-Piece construction: Conventional rotors are unable to cope with the stress of drastic heat fluctuations and are prone to warping. ECS 2-Piece semi-floating rotors allow the radial expansion of the rotor ring - preventing warping.
Drilled and slotted: 2-Piece rotors are cross drilled to promote cross ventilation for improved cooling as well as slotted to clean brake pads and carry away water and brake dust. Cleaner brake pads result in faster, more consistent stopping. Drilled holes are chamfered while slots are machined with a ball end mill - both to prevent cracking that may be present on improperly machined rotors.
Overall weight savings: This particular ECS 2-Piece rotor weighs only 15.3 lbs compared to a stock E46 M3 rotor at 18.5 lbs. Lighter rotors reduce unsprung weight and rotational mass to improve both braking and suspension performance.
Manufacturing quality: Non-friction ring surfaces, including internal vents, are painted to resist salt and other corrosives. Ground braking surfaces ensure rings run parallel, and pads bed easily.

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For vehicles without CSL or Competition Package (ZCP) brakes.