Space Bar is the actual brake if you aren't using the reverse. Also with the W (forward), S (reverse), A (left turn) and D (right turn)as your basic moving controls...the space bar for brake and Shift for boost, there's really nothing else to know. Just spend time adjusting and you'll pick it up.
I'm with Ensu. I love the WASD character controls because I prefer using my mouse to camera around my character to look at the sides and behind without having to turn while moving. But in the end, we all play differently so not everyone will be appeased.