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Brakes slow a car down by converting kinetic energy to thermal energy, so a larger rotor improves a brake system's ability to both absorb and dissipate heat. The 13-inch front rotors included in the Track-4 kit provide plenty of thermal capacity for our Cutlass. Cross-drilling is primarily for aesthetic purposes, but brake slots promote even pad wear and prevent gas building between the pad and rotors. Whenever installing new rotors, they should be sprayed down with brake parts cleaner to remove machining oils and debris.