Quote Originally Posted by [1990]525
Has anyone swapped the 850i brakes in front and 540i brakes in the rear and recorded some stopping distance numbers? Just curious...
I wouldn't expect a shorter stopping distance. The factory brakes can already initate the ABS thus demonstrating more than adequate braking torque.

The reason to upgrade would be improved heat dissapation under repeated stops (ie: track use).

Jeff --> M5 front brakes and 540 cooling ducts, stock rear brakes