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post #1 of (permalink) Old 12-16-2004, 11:18 PM Thread Starter
 
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Pitted or scored brake rotors

The standard rule that I have seen in various manuals (and elsewhere) is that "pitted or scored brake rotors should be resurfaced or replaced." The problem is they never say how bad the pitting or scoring needs to be to require the rotors to be resurfaced or replaced. I guess that only comes with experience. I know there are probably some guys out there who would say you should resurface or replace the rotor even for minor pitting or scoring (or even just "glazing"). On the other hand, I know of other people who say that you should never "turn" rotors unless it's absolutely necessary, because you often end up with warped rotors.

I've seen pitting on a rotor that did not seem to have any obvious adverse effects. How bad does pitting have to be to cause problems? And what problems would it cause?


Phil
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post #2 of (permalink) Old 12-17-2004, 08:05 AM
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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.

~daxe
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post #3 of (permalink) Old 12-17-2004, 03:02 PM Thread Starter
 
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Re: Pitted or scored brake rotors

My impression is that minor defects in the rotor surface aren't a big issue. About two years ago I had to have a front manual hub rebuilt. The rotor was scored, but not severely. A Chevy dealership did the work, and they just left the rotor the way it was. Initially, they told me it needed to be replaced. But when I picked up my Tracker, the old rotor was still on there (I checked). They didn't even resurface it because the score line was still clearly visible. I was a little angry at first because I thought they had charged me for a new rotor, but then I checked the invoice and saw that they hadn't.

Of course, just because the Chevy dealership didn't replace the rotor doesn't mean it didn't need it. But I am assuming that the mechanic who did the work is more knowledgeable about this than I am.

Phil
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post #4 of (permalink) Old 12-17-2004, 03:06 PM Thread Starter
 
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Re: Pitted or scored brake rotors

> 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.
>
> ~daxe

Thanks for the reply, daxe. If you can find a citation or two regarding this, I will definitely be interested in seeing them.

Phil
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post #5 of (permalink) Old 12-17-2004, 05:47 PM
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