EBC GD7511 09-12 Chevrolet Colorado 2.9 GD Sport Front RotorsEBC GD7511 09 12 Chevrolet Colorado 2. 9 GD Sport Front Rotors Product Information EBC Sport Rotors feature wide aperture slots that draw cool air into the braking contact area and reduce temperatures preventing brake fade. Dimple drilling avoids stress cracks and the anodized EBC finish provides a great look while preventing corrosion. EBC Sport Rotors now feature reduced 3 slots venting which provides slightly less air noise under heavy braking