Quote:
Originally Posted by afterburn 549
If they are not warped (pulsating pedal), there is no reason to machine them true as they are.
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Correct, outside the rustbelt and salty air locations. No reason is too broad a statement to me. Normally?
Porsche uses good material that does not corrode easily which is another plus. However, refaced rotors will give a nice surface to bed the pads into.
There are several reasons in the rust belt to reface rotors. One is the outer rotor lip rusts and when you put new stainless retaining clips in for new pads the rust may rub on the retainers.
Also, I usually remove the caliper bracket and remove the rust on the retaining clip faces so they (and the pads) fit properly. Since the bracket is off the rotor can come off "easily" and I use a needle scaler to smooth the mounting surface for the lathe. There is usually plenty of rust scale to remove (mainly on the side walls up into the fins). I pay $12 per rotor to get turned.