As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RIGHTHAND AND LEFTHAND BRAKES STARTED PULSATING, DURING TAXI AND WHEN STOPPED. THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND REPLACED THE BRAKE METERING UNIT, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 32-42-03. OPERATIONAL AND LEAK CHECKS WERE COMPLETED, AND THE AIRCRAFT WAS RETURNED TO SERVICE.