Well, I'm no auto expert, but I would highly suggest taking it in to a reputable mechanic (you don't necessarily have to go to the Big Guys, but please don't go to some fly-by-night jack-leg who'll rip you off). It could be something as simple as a glitch in the electrical system making the light come on (false alarm; my mom's oil light does that on occasion) or it could be that you need brake fluid. At the very least, your brakes need to be inspected to rule out something major happening and a lot of places will do that for free. Good luck!