| The wear is measured in thousandths of an inch. If you install and completely wear out a few sets of pads without turning the rotors, you'll end up with enough taper in the rotors to where the new pads won't contact the full surface area. The reduced surface area generates more heat in the pad when slowing the car. The pad will flex to form fit the rotor when brake pressure is applied. Both conditions caused the cracking. I'm not saying that you turn the rotors at every pad change. I'm saying that the O.P. needed his rotors turned before the last set of pads were installed. If you track your car and replace the pads regularly, you're doing your rotors a favor. My DD cars get cheap mid-grade pads because those high dollar, lifetime guarantee, pads eat up the rotors. Have you only had two cars?
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