As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MLG BRAKE: UPON LEAVING THE CHOCKS I APPLIED BRAKE PRESSURE AND THE BRAKES CONTINUOUSLY VIBRATED AND BECAME VERY "GRABBY". CORRECTIVE ACTION: BLEED BRAKE AND EMERGENCY/PARKING BRAKE SYSTEM BLEED IAW TC-E50-32-1001, REV 0 AND EMB505 AMM TASK 29-10-00-910-806-A AND TASK 32-40-00-870-801-A