Childishly simple in design, the brake is simply a half-moon of metal situated over the real wheel. You step on it, you stop. You don't step on it, you don't stop. The only complaint that I have is that the steering column could be a little taller. I know that there are size limitations because of the design, but taller riders will be a bit hunched over.
Fat riders are fine, though.
I weigh a hefty 475 pounds and the board didn't even buckle during my ride, not even on the half pipe. Most exciting is the Razor MS-130A2, which features front suspension, a wheelie bar, flashing LED pods, and a multi purpose clip. And that's that. Buy this thing if you want a scooter. It kicked my ass.