As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FIGHT CREW REPORTED THAT WHILE TAXING FOR TAKE OFF. APPROACHING HOLD SHORT. APPLYING BRAKES TO COME TO STOP. WITHIN LAST 5 FT. OF COMPLETE STOP, HEAR LOUD BANG SOUND. THEN ECAM WARNING DISPLAYS BRAKES SYSTEM 1 FAULT. MAINTENANCE REPLACED THE BRAKE STEERING CONTROL UNIT (BSCU) AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 32-42-34.