As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING DURING TAXI BACK TO THE RAMP, PILOT EXPERIENCED POWER BRAKE FAILURE. WAS ABLE TO CONTROL THE AIRCRAFT AND RETURN IT TO THE PARKING RAMP SAFELY. MECHANIC'S TROUBLESHOOTING REVEALED THAT THE POWER PACK PUMP MOTOR HAD FAILED. THE POWER PACK ASSEMBLY WAS REMOVED AND THE MOTOR WAS REPLACED. THE POWER PACK ASSEMBLY WAS REINSTALLED AND THE BRAKE SYSTEM WAS BLED. BRAKE SYSTEM RESUMED NORMAL OPERATION. THE AIRCRAFT WAS RELEASED FROM MAINTENANCE AND RETURNED TO SERVICE.