As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, BRAKES APPLIED UNEVENLY. ACFT PULLS HARD RIGHT. FEELS LIKE THE LEFT MAIN BRAKE INOPERATIVE. INSPECTED ALL FOUR BRAKES AND WHEEL ASSEMBLIES FOR DEFECT. FOUND NR 3 WHEEL ASSY IN POOR CONDITION. R & R IAW AMM 32-45. FOUND THE NR 4 BRAKE ASSY AIR IN HYD SYS. BLEED ALL FOUR BRAKES IAW AMM 32-41.