i took a trip to Flint 2 days ago and everything was fine on the way there....but at the time i'm heading back home, when i started the car, the brake warning light went off. i thought it was probably the snow and ice frozed out the handbrake, so i went to a car wash at a gas station to give a try to defrost it, but the warning light still there after the wash.....the brakes still worked, but it took longer stopping distance than it used to stop the car....does anyone have any idea about this? my car is 99 accord ex v6.

thanks!!