My dealer is saying my front discs are due for replacing as they are down to 4mm the BMW tollerance. I need pads anyway( apparently) but suspect my Discs would be good for amny more 000' of miles. the bike is 2008 and has covered 40k. The rear disc was replaced last year at 4mm but I felt in hindsight It was an unnecessary expense. Feedback welcome please. Also any ideas about getting Pads and or discs replaced at less cost. I live in Hampshire near Petersfield and Alton. Thanks JJ Jeremy