As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT REPORTED AS HE WAS TAXIING N763FE BACK TO THE PARKING SPACE AND MAKING A LEFT TURN THE LEFT BRAKE PEDAL WENT ALL THE WAY DOWN TO THE FLOOR. HE STATED HE WAS ABLE TO CONTROL THE AIRCRAFT WITH LEFT BRAKE AND A LITTLE REVERSE. AIRCRAFT WAS INVOLVED IN A RIGHT BRAKE FAILURE THE WEEK PRIOR AND IS SUSPECTED AIR MAY HAVE ENTERED THE LEFT BRAKE SYSTEM DURING PREVIOUS MAINTENANCE.