As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A SHIMMY ON TAXI, AND RETURNED TO GATE. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT, AND DISCOVERED THE RT O/B MLG BRAKE WAS DISINTEGRATED. MAINTENANCE REMOVED AND REPLACED THE RT O/B MLG BRAKE PER EMB AMM. A/C WAS THEN RELEASED BACK INTO SERVICE.