As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: BRAKE HAS NO RESISTANCE. WHEN FULLY DEPRESSED IT WILL LOCK COMPLETELY. MAINTENANCE FOUND RESERVOIR 2624GM LOW. PERFORMED FILLING AND BLEEDING OF THE LOW PRESSURE CONTROL SYSTEM OF THE ALTERNATE BRAKING SYSTEM PER AMM 32-43-00. PERFORMED SUCCESSFUL TAXI CHECK OUT, NO DEFECTS NOTED.