2013 BMW M3 (F30) testing at Nürburgring

[Setra]

http://www.youtube.com/watch?v=gcIoUdxwHb8&feature=context-cha

[xcore]

rear wheels are deep as a bucket, looking forward to it,

[RAAS al Guggy]

Silly question...why do the rear brake discs look blue while the front brake discs look..."normal"?

[mryakan]

Silly question...why do the rear brake discs look blue while the front brake discs look..."normal"?
It's a prototype, so who knows!