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Originally Posted by sdharmani
OEMs cross drill to save weight ... cooling happens through the gap between the two sides of the rotor.
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Weight savings is minimal. Brake pads out-gas under heavy braking and cross drilling allows those gases to escape so the pad maintains contact with the disc. Modern brake pads out gas much less than before so it's not as much an issue but the performance image of drilled rotors sells. The downside to drilled rotors are they eat up pads quicker and if subject to repeated heavy braking, cracks can emanate from the holes.