As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THAT THE LEFT MAIN BRAKE IS INOPERATIVE. MAINTENANCE INSPECTED THE BRAKE ASSEMBLY AND NOTED THAT A BRAKE ASSEMBLY GUIDE PIN BOLT HAD BROKEN AND CAUSED THE BRAKE ASSEMBLY TO BECOME INEFFECTIVE. REPLACED THE LEFT BRAKE ASSEMBLY, TORQUE PLATE, TIRE ASSEMBLY.