I know there is a lot of different info out thefe but this is worth a read if you get 5 minutes. Explains to an extent the colour of my discs after 10 minute sessions round Donington. :coffee:
http://www.essexparts.com/learning-center/cat/brake-pads/post/Bed-in
http://www.essexparts.com/learning-center/cat/brake-pads/post/Bed-in