The most important pedal, for reasons that really need no description, is the throttle. Without it, the car is a really slick static advertising panel worth a couple hundred thousand dollars. The clutch is important because it links up the 800-plus-horsepower engine to the transmission and turns it from slick advert panel to moving billboard.
The third pedal, while not as sexy as the other two, is absolutely essential: the brake pedal.
With Bristol Motor Speedway on the horizon, the brake pedal is going to be even more important than it already is. Richmond in a few weeks is the same way. Any short track is going to put a premium on braking, and even 1-mile tracks like New Hampshire are a brake tech’s worst nightmare.