As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, LOW BRAKE PRESSURE ANNUNCIATOR LIGHT ILLUMINATED FOLLOWED BY LOSS OF BRAKES. THRUST REVERSERS DEPLOYED AND EMERGENCY BRAKES USED TO SUCCESSFULLY STOP THE AIRCRAFT. CREW REPORTED POWER BRAKE CIRCUIT BREAKER WAS EXTENDED. MAINTENANCE REPLACED THE POWER BRAKE MOTOR AND HIGH PRESSURE SWITCH. BRAKE SYSTEM WAS BLED FOLLOWED BY A SUCCESSFUL OPS AND TAXI CHECK. AIRCRAFT WAS RETURNED TO SERVICE.