Originally Posted by Drifty//
I think some street use is highly desirable, prior to bedding. I've read that you want to wear in the pads a little bit, so that they start to conform to the rotors (like 15-25 stops at city speeds). Otherwise, the pads will have microscopic hot spots when you start bedding them. I'm not sure what that does (pad glazing? increased rotor wear?).
What the city driving does is clean the previous pad deposits off. Even after bedding, driving around town for a few weeks will scrub all the material off--just bare polished metal. It takes real heat to transfer pad material (burnish) to the rotor face. Cold brakes (city driving) will act as scrubbers over time.