I could not get my dash light to reset after fixing a brake line leak. While having the car turned on my buddy opened a front wheel bleeder valve. Meanwhile I steadily depressed the brake pedal. As it got to the bottom the light went out. My buddy closed the valve -- problem solved, YES! Apparently this centered the pressure differential valve, which caused the light to go out. Just thought that I would share this. Thanks for taking the time to help me.