LoL I won a race years ago just by luck a caution was called & under yellow I noticed the leader's rotor wasn't turning at times. On the restart I just dove under him on corner entry. His key had fallen out & every time he touched his brake under caution the rotor would stop butt he kept on rolling.Is the key in the axle? Just kidding. Chances are you're not bleeding the brakes right, seen it before. (hint: don't pump the pedal and make sure the bleeder screw is the highest point in the system).