Join Date: Feb 2001
Location: socialist lib heaven mASS
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Re: Pitted or scored brake rotors
I am no kind of expert on this, but I generally just replace rotors when I do brake work, now. It's not too much more expensive than having the old ones turned and I don't end up with thinner rotors (in spec or not) that have less ability to dissipate heat and therefore more likelihood of warping.
Pitting (according to what I have read) is a problem because of the integrity of the braking surface having been compromised. An incredible amount of heat is generated during braking and part of the job of the rotor is to dissipate it evenly. Pits and the area around them dissipate heat at a different rate from the rest of the rotor and eventually can lead to breakage, separation of the machined surface, etc. As it is they can cause the rotor surface to harden in those areas, making for an overall uneven surface, which can contribute to premature pad failure and 'brake shake' and all kinds of great stuff.
Sounds pretty minor, but brakes are nothing to trifle with, IMHO. I'll see if I can find a citation for this someplace to back up my opinion.