As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI ON CO-PILOTS SIDE, LT BRAKE PEDAL GOES NEARLY TO THE FLOOR BEFORE BRAKING ACTION IS FELT. INSPECTED ALL BRAKE MASTER CYLINDERS, FOUND PILOT LT PEDAL MASTER LEAKING. TIGHTENED B-NUT AND BLED BRAKE SYSTEM, NO LEAKS ON OTHER MASTER CYLINDERS OR ON BRAKES, SERVICED BRAKE RESERVOIR. TAXIED AIRCRAFT WITH PILOTS BRAKES OPERATING NORMALLY IAW 560 MM CHAPTER 32-42-02.