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Originally Posted by GarySheehan
The state of a rolling tire versus a locked tire is dependant on the coefficient of friction between the road surface and the tire versus the braking force applied to the rotor based on pedal pressure. It is a linear progression that rolls off as the tire adhesion is exceeded. As a matter of fact, maximum braking occurs when the tire is rotating just slightly slower than road speed.
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It's also dependant on the instantaneous normal (downward) force on the tire, from weight and any aero download, since the normal force acting with the coefficient of friction is what enables the longitudinal braking force at the tire/road to be developed. F
braking = CF * F
normal. A tire with the same CF with the road obviously won't be able to sustain the same braking force over the crest of a sharp rise at 100mph as it will on a level road, since there's less normal force on the tire.