As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT DEPARTURE. AIRCRAFT STARTED ROLLING ON TAXIWAY AND BRAKE TEST PERFORMED. BRAKE PRESSURE LOW AND ANTISKID FAIL ALARM WARNING ON. FLIGHT CREW NOTICE THAT THE NORMAL BRAKING IS INOPERATIVE, THE CBD ACTIVATES THE EMERGENCY BRAKING, RETURN TO BLOCKS. AIRCRAFT SET TO THE TECHNICAL SERVICE FOR ANALYSIS AND RESOLUTION OF THE FAILURE. PRELIMINARY TECHNICAL CHECKING SHOWS THE ELBOW SWIVEL ON THE HYDRAULIC BRAKING SYSTEM FOR THE RT MLG BROKEN. ALL HYDRAULIC FLUID LOST.