A technique where the driver uses the left foot for braking while the right foot stays on or near the throttle. This eliminates transition time between pedals, enables smoother weight transfers, and allows overlapping brake and throttle inputs.
Bentley explains in Ultimate Speed Secrets why the technique is superior: "Left-foot braking allows you to alter the speed of the car, which is what you use the brakes for, without upsetting the balance as much. It is easier to drive smoother. Anytime you can drive smoother, upsetting the car's balance less, the higher its traction limits will be. And that means you can drive faster." He identifies the specific advantage at corner transitions: "If you cannot make the transition from brake to throttle in the corner seamlessly, you will never carry good midcorner speed. This is another area where left-foot braking has an advantage, as it is much easier to make a seamless transition. In fact, when using your left foot on the brake and right on the throttle, there is usually a little bit of overlap, making it much smoother." The technique eliminates the dead time of moving a single foot between pedals — time where the car is effectively coasting.