What was found
NLG: ON TAXI NOSE WHEEL SHIMMY OBSERVED AT LOW AND HIGH TAXI SPEEDS. RIGHT MLG BRAKE: ON TAXI OUT DOING THE BRAKE CHECK IT WAS OBSERVED THAT THE BRAKES ARE EXTREMELY GRABBY, FURTHER ON TAXI THE RIGHT BRAKE SEEMS TO BE MAKING A SHRILLING/ GRINDING SOUND THAT IS QUIET DISTINCT. SOUNDS LIKE METAL RUBBING ON METAL . SOUND MORE PROMINENT FROM THE RIGHT SIDE . REMOVED AND REPLACED TORQUE LINK UPPER AND LOWER ATTACH BOLTS. IAW CE-680A CMM 32-20-02. REMOVED AND REPLACED THE #3 & #4 BRAKE ASSY. IAW AMM 32-40-05. OPS CHECK GOOD.