same here.
I'm going to try to unplug the sensor on my splitter block. if the light goes off, then I know somethings up re: my brakes (I'm about to go under it and check for line leaks and such) but if it stays on, then its something else.
BTW: if I hit a bump, it flickers a bit then goes out, hit anothe bump and back it comes.
It sounds like it's the parking brake pedal switch causing your problem. The parking brake might not be fully disengaged or the pedal is hanging down a little bit causing the light to be on as if the brake is on. Try pulling up on the parking brake pedal with your hand when the light is on and see if it goes out. If it doesn't go out also try pulling the parking brake release and pulling up on the pedal at the same time just incase the pedal is still on one click or so which won't allow you to pull it up and see if the light goes out then. Hope this info helps.