Break light keeps coming on, but the breaks are fine, what could be wrong?

Hang on...

Yeah, ok, I've just realised that we're talking about two different things. When I posted my clarification request, I thought you were talking about your brake lights.

You mean the brake warning, yes?
Right, in which case, how do you know the brakes are fine? Has a qualified mechanic checked them out? If so, then you've got a dodgy connection there. If not, I'd say the brakes aren't fine and do need looked at.