Well, these guys are left-foot braking on purpose. That is to say being on the throttle and brake at the same time. It can make a huge difference in a front-wheel drive car, as you can help tame the understeer by braking the rear end. I'm not sure of the dynamics of what happens in an F1 car when the brakes are applied while still under throttle, but these drivers really know their cars, if there is something that'll get another 1/10 of a second out of a lap, they'll find it.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris