Or your trying to induce a spin.
Brake and throttle are common control methods if the driver wants to use it. It doesn't do the car any good and does nothing for longevity in the race if your continually using it. And it's also inefficient use of fuel. You should be either braking, or throttling. Not both at the same time. But sometimes, if you want to balance the car, or you have found the car/tracks responds to that input at a certain point, then it's another tool in the drivers arsenal. Damn difficult to do if your not a racer. Not that you would want to do it on the road.