At first symbol on dash came and went. Took to my mechanic and brake fluid was only about 2 oz. low. He filled. Two weeks later, light comes on and stays on. Tried setting and releasing parking brake, no change. Changed burned out brake light, no change. Added brake fluid, no change. Brakes were completely checked by mechanic and all good. Has anyone encountered this problem? Last resort is to take to dealer to see if computer hookup can solve.