Physics of Braking

Download this excellent White Paper discussing all the Physics involved in Disc Braking Systems. Although written by an engineer at Delphi for Automotive applications, everything applies to Mountain Bike braking systems from the Rotors to the Wheels to Hydraulic Fluid to Weight Transfer. Even if you don't like the math or the equations, it's a good explanation of why Front Rotors should be bigger than Rear Rotors on a Mountain Bike.

Braking Physics