Because I am not a rally driver with lots of Ks in my name, I do not left-foot brake much. You know the technique: pushing a brake pedal with your ‘wrong’ foot while the right foot hovers on or around on the accelerator.
Racing and rally drivers do it all the time, to slow a car while simultaneously maintaining a preferred cornering balance. Or perhaps there’s engine lag and they want to make sure it spools more quickly. Or perhaps a car is running wide and they want to just brush the pedal to bring it back into line. And sometimes they like to blur the line between slowing for a corner and picking up the throttle on the way out.
I’m sure there are other reasons, too, but I don’t really understand them much, which is why I don’t do it often.
The other week, though, I felt compelled. The Lamborghini Aventador SV has a great big brake pedal seemingly set up perfectly for the job, and it also seems to like to be told precisely what to do at any given moment, because it feels notably wayward should you find yourself in the middle of a corner while not touching either of the pedals, and even more lively if you jump from the throttle to the brake.