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Excessive heat can cause resins in your brake pad to vaporize or "outgas." As the brake pad wears, the used friction material turns into a fine dust. This boundary layer of heat, gas and dust builds up between the pad and rotor surfaces and inhibits performance. Here's where StopTech SportStop Drilled & Slotted rotors make a big difference. StopTech SportStop Slotted Brake Rotors are a true performance rotor.