I recently fitted new Zimmerman rotors and Bendix Ultima pads to my 94 E36 M3, two weeks later I did some track work, actually it was a racing driver training course.
As the day progresed and my speed increased, braking distances got shorter until at the end of a downhill straight (190kmh) into a 90degree right hand bend, I found to my suprise I had very little stopping power and almost ended up into the kitty litter, fighting to stay on the track.
I proceeded to do a cooling off lap and when I returned to the pits all four rotors were blue. I have only driven the car for 1-2 days since and the rotors are still slightly blue. My question is do I need to remove the rotors and skim them, or will they bed in within time and return to the metalic shiny surface?