Can anybody shed some light on anti-lock braking systems? I currently have a model that calculates a vehicle stopping using kinetic sliding friction i.e. it skids to a stop with coefficient of friction at around 0.7 asphalt/tyre or tire which ever you prefer ABS I believe maintains static friction throughout the stopping process through millisecond releases. The coefficient of friction is therefore with the brakepads and discs. Is this true and if so what is the coefficient of friction? All I can find is steel on steel which is 0.4. This is less than the kinetic coefficient and would result in a higher stopping distance or am I wrong?