What was found
LEFT & RIGHT MAIN GEAR BRAKES ARE INOPERATIVE. ON INITIAL BRAKE CHECK, BRIEFLY LOCKED. ON TAXI, THE BRAKES CHATTER LOUDLY & ARE INEFFECTIVE. BRAKES FULLY APPLIED GIVE VERY WEAK CHATTERING BRAKING. TECHS PERFORMED CMC AND CVDR DOWNLOAD ADDED ON THE SHARE POINT FOR REVIEW. GAIN ACCESS TO THE BCU. REMOVED & REPLACED BCU. PERFORMED SYSTEM OPS CHECK, NO DEFECTS NOTED. TAXIED THE ACFT & PERFORMED VARIOUS BRAKE TEST, NO DEFECTS NOTED. GAINED ACCESS TO THE FDR AND PERFORM A DOWNLOAD. AFTER THE DOWNLOAD, UPLOADED FILES TO THE SHARE DRIVE THAT AS PROVIDED. REINSTALLED LAVATORY PANELS ACESSED. ALL WORK PERFORMED IAW AMM 32-41-00 & 31-33-00.