Every time i turn on my car in the morning the brake light comes on & wont turn off even if I released the hand brake. I checked my brake fluid & its in maximum level. Mechanic told me there maybe a short. What you guys think? The light turns off when im going slow to my parking area. Then if I start the car again eveything is fine. It didnt have this problem before. Only after removing the brake disc rotor. What you think is the problem? Thanks.