Quote:
Originally Posted by ZED SLED
Probably depends on type of car, but these days rotors are typically cheaper and thinner making them throwaways. You might get by with one turning but likely with the rotor even thinner now you stand a good chance of warping. For do it yourselfers there's also the time involved of removing the rotor, taking it to a shop, picking it back up, then reinstalling. Easier to just replace.
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Quote:
Originally Posted by CamaroDreams76
Yes you are supposed to but my advise is to just replace the rotor. This is supposed to be performance car, why cheap out. The throw away thickness is pretty close if not met when the pad life done. Then performance aspect, your making the rotors thinner so the heat resistance is less if tracking or doing any sort of performance driving.
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Sorry, but I have to add some color to this advice. Let's look at stock ZL1 front brake rotors as an example: these 390 mm diameter rotors have a new thickness of 36 mm, a minimum allowable thickness after refinish of 35 mm and a discard thickness of 34 mm.
First of all, it is
very unlikely that the stock pads on a street driven car would abrade a full 2 mm off the rotor after both either start out new or are replaced together.
Second, these units are pretty hefty even at discard thickness, there is absolutely no way they would warp even down to 34 mm thickness (this sounds more like an urban legend to me); and third, the MSRP for one of these rotors is $800-900, and while one can get them at half price from other online sources, even that is almost a grand just for front rotors.
So yeah, replacing rotors and pads together is a very convenient and elegant option, but also a preeeetty expensive proposition that can very well be unnecessary, so IMO it's a bit flippant as a general suggestion.