As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WORN BRAKES: ON TAXI OUT NOTICED BRAKES WERE NOT ENGAGING WELL AND HAD A STRONG VIBRATION. FELT LIKE INTERMITTENT APPLICATION AND STRUGGLING TO GRAB. CORRECTIVE ACTION: REPLACED BRAKE CONTROL UNIT IAW EMB PH300 AMM 32-41-01 OPS CHECK GOOD