All the manufacturers of high performance brake pads have specific bedding-in procedures for their new pads that require new or resurfaced rotors. I'm pretty certain that they wouldn't waste their time recommending that if it didn't make a difference. Have you ever done a measured braking test on your vehicle to compare stopping distances with bedded pads on a fresh surface vs. non-bedded pads on an old rotor surface? I'm willing to bet the brake pad manufacturers have done quite a few of them, which is why the procedure is recommended.
http://www.hawkperformance.com/sites/default/files/downloads/Motorsport_Pad_FAQ.pdf
http://ebcbrakes.com/articles/how-to-bed-in-new-rotors/
http://www.powerstop.com/brake-pad-break-in-procedure/
http://www.pfcbrakes.com.au/techtips.php?pageId=18
http://www.stoptech.com/technical-s...ions-and-procedures/stock-brake-system-bed-in
http://www.hawkperformance.com/sites/default/files/downloads/Motorsport_Pad_FAQ.pdf
http://ebcbrakes.com/articles/how-to-bed-in-new-rotors/
http://www.powerstop.com/brake-pad-break-in-procedure/
http://www.pfcbrakes.com.au/techtips.php?pageId=18
http://www.stoptech.com/technical-s...ions-and-procedures/stock-brake-system-bed-in
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