Are You Talking About A Disc Lock? Inspect The Caliper And Rotor For Damage, Carefully Inspect The Rotor Mounting Bolts And Caliper Mounting Bolts For Damage And Proper Torque. Bleed The Brakes To Remove Any Air. Most Likely You Damaged To Rotor And May Need To Replace It. Remove The Bike Lock And Soak It In Warm Salt Water For 24 Hours. Discard The Motorcycle.