As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT BRAKE PEDAL ON LEFT SIDE GOES ALL THE WAY DOWN WHEN BRAKES APPLIED. TROUBLESHOT LEFT BRAKE TO MASTER CYLINDER. REMOVED AND REPLACED PILOT'S LT WHEEL BRAKE MASTER CYLINDER WITH A SERVICEABLE INSPECTED BRAKE MASTER CYLINDER IAW ESSNA 560XL MM CHAPTER 32-42-02. BLED BRAKE SYSTEM IAW CESSNA 560XL MAINTENANCE MANUAL CHAPTER 32-42-00. LEAK AND OPERATIONAL CHECKS SATISFACTORY.