For the past few months now, my brake light will come on and off. At first I thought it was just my handbrake freezing in the cold weather, but took a 1600 mile trip to OBX last week and notice it come on and stay on, then go away, then come on, etc. I checked the brake fluid it's below the halfway point between high and low, so that should be enough. Brakes feel fine despite the horrible vibration from my slotted 06 rotors(Blehmco BBK). Any ideas?