Quote:
Originally Posted by q-authority
Yeah, resurfacing them is definitely cheaper, but also don't expect them to last as long as they did originally, before showing signs of warping again. But you generally get your money's worth out of the deal since it is usually so cheap to do this. Just remember that you guys who buy slotted or cross drilled discs can't have them resurfaced unless you find a specialist who can do those kinds of rotors, and they are very few and far between. The cutting blade on a normal machine would catch on the slot/hole.
I have never noticed brake pad material build-up, and I am surprised I have never read about it before (at least that I can remember). But warping definitely happens, one way or the other.
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I would think that warping (the plate becoming deformed so that it is no longer "flat") could be confirmed by testing runout using a fixed feeler gauge. I don't have it in front of me but I remember that the BGB has a description of this test and acceptable tolerance numbers for runout on the rotors.
Sorry for asking a stupid question, but if the rotor is really not flat anymore, why would resurfacing fix it? I assume that to get it flat the cutter would take off more material from one portion of each surface than other portions and the result would be a plate that does not have the same weight/balance all the way around. Just curious since I usually get slotted rotors so when they go bad I have to replace them.
And the pad material buildup that I have been aware of on my brakes has been very obvious since I will have visible pad outlines on the rotor. I have even tried fine sandpaper to see if I can get any off and they don't come off.