What was found
PILOT REPORT - CAPTAINS LEFT BRAKE PEDAL LOOSES PRESSURE AND GOES TO FLOOR - NO BRAKE. MAINTENANCE REPLACED THE CAPTAINS LEFT BRAKE MASTER CYLINDER.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
PILOT REPORT - CAPTAINS LEFT BRAKE PEDAL LOOSES PRESSURE AND GOES TO FLOOR - NO BRAKE. MAINTENANCE REPLACED THE CAPTAINS LEFT BRAKE MASTER CYLINDER.