As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RIGHT HAND BRAKE PEDALS ON THE PILOT AND FIRST OFFICERS POSITIONS, PULSATED WHEN BRAKES WERE COMMANDED. THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND REPLACED THE BRAKE METERING UNIT IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 32-42-03. OPERATION AND LEAK CHECKS WERE COMPLETED.