As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CO-PILOT RIGHT BRAKE PEDAL LOST PRESSURE DURING TAXI. BLEED OFF CAUSED A SOFT PEDAL. INSPECTED SYSTEM FOUND, CO-PILOTS RT MASTER CYLINDER LEAKING FLUID. REMOVED AND REPLACED O-RINGS. BLED BRAKE SYSTEM. OPERATIONAL CHECKS AND LEAK CHECKS GOOD. MAINT PERFORMED IAW CC560 MM CHAPTER 32-42-00.