Braking is also used to control weight distribution before cornering, shifting weight to the front wheels to allow for a sharper turn. Optimization occurs when

Braking is also used to control weight distribution before cornering, shifting weight to the front wheels to allow for a sharper turn. Optimization occurs when the centrifugal force's direction is counter balanced by the friction of the tires, which varies with acceleration and braking. Optimal lines depend on the shape of the turn, but max braking always occurring right before the apex and shifts to high acc after. Really though, its max brake/acc without slipping not just 1/0. Traction control/abs simplify the situation at the racer input level, allowing optimal strategy to approach 1/0 by functioning as a micro instance of the bang bang strategy. The abs/tcs is 1/0 due to optimization, not simplicity, since a variable input would not allow the wheels to return to a rolling state anymore quickly.