In reply to a message from digdoug2 sent Fri 5 Jun 2009:
I am with Carl on this one. I have replaced many a pad without
turning the rotors, as long as the rotors are not heavily grooved.
I have noted no ill effects, even on my cars that are used at road
racing tracks. If we change pads at the track we do not change or
turn the rotors while doing so. It takes a short time to seat the
new pads to the surface of the rotor so the early braking is
slightly lessened but after seating the brake performance is normal.
I have used organic, semi-metallic, and ceramic pads in these
changes, with no obvious differences in reaction of the different
Removal or rotor material by grinding also removes a portion of the
heat sink capability of the rotors and makes them more prone to
warping if they become quite hot, as on the track. I have had
rotors turned in the past to correct warping and it was not too
long afterward that they were warped again and I just ended up
I will agree that new rotors or newly turned rotors is the ideal
situation when changing pads but feel very strongly that it is not
necessary in many cases. The typical repair shop will always
suggest turning or replacement for two reasons: 1. They make more
money on the job. 2. They do not want comebacks.
Since I do all my own brake work, these reasons are not relevant to
Harold, if you are going to park your cars in the garage if either
Carl or I come to your area, that is wonderful! There will be less
cars with which we have to share the road and fewer traffic
I do believe that you are being overly conservative in your
opinion, however, and I am speaking as an automotive engineer with
about 45 years experience in the OEM, aftermarket, and competition
Just my $ .04 (After inflation).
91 Classic Collection Convt. (NCHNTRS)
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