I work at an autoshop with the name called Brake Specialists Plus. Once my own pads on my Z are at discard, I'm replacing the rotors. I drive my car hard and brake hard. Keep in mind that rotors are relatively cheap if they are stock OEM. They're only about $80-120 each wherever you buy them from. My rule is that if one of my customers bring in slotted rotors to machine/cut, I won't lathe them. I wouldn't want to waste their time or mine. Now for other "passenger" cars, I measure out the rotors and determine if they can be cut or discarded. Alot of European cars require replacement of pads AND rotors during a brake job.
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