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Cross drilled rotors are an old school relic. Apparently, old brake pads use to produce lots of gas; this would cause the pads to float on the rotors instead of grabbing them which lead to no braking. So they put in the holes so the gases could escape. That's not a concern anymore really today. By drilling holes in the rotors, you introduce high stress points which leads to them cracking. Good x-drilled rotors will have chamfers which will help relieve the stress but they will eventually still crack. Even the factory Porshce x-drilled rotors crack all the time; makes me wonder why they still use them. Basically, go look at any real race car (F1, CART, IRL, Touring cars, WRC rally cars, NASCAR even) and they all use either solid or slotted rotors. That's what I've heard anywayz...
Khiem
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