As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CREW RUN UP CHECKS PARKING BRAKES AND TOE BRAKES WILL NOT EFFECTIVELY HOLD AIRCRAFT. MAINTENANCE TROUBLESHOT THE DISCREPANCY TO LEFT AND RIGHT OUTBOARD MAIN BRAKES APPROACHING THE MAXIMUM WEAR LIMITS. BRAKES WERE REPLACED. OPERATIONAL AND LEAK CHECKS COMPLIED WITH. AIRCRAFT WAS RETURNED TO SERVICE.