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Re surfacing Rotors
I will say this once on the basis of proven practical racing experience and once only and am not prepared to enter into any futile argument.
Provided radial scoring is not excessive and is laterally true and braking prior to pad replacement has been smooth, removal of metal from a rotor is not required. New pads will bed in on the true corrogated surface without a problem or effect on braking performance.
However a shop can show the surface to the customer aptly described as requiring immediate extra expenditure. What is more grinding will bring the customer much closer to the point of having to hand over more money for replacement rotors and this is good business. Furthermore it wiil only be a short time before the scoring is again apparent and the process can be repeated.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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