As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS BRAKE CHATTERING DURING TAXI, SHAKING AIRCRAFT AT LOW SPEEDS, DIFFICULT TO STOP AIRCRAFT SMOOTHLY. MAINTENANCE REMOVED AND REPLACED THE NR 3 AND 4 BRAKE ASSY. IAW AMM 32-41-41. PREFORMED TAXI CHECK, NO DEFECTS NOTED AT THIS TIME, IAW AMM 32-41-41.