As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COPILOTS BRAKES SPONGY. LEFT PEDAL REQUIRES SIGNIFICANTLY MORE TRAVEL TO ENGAGE BRAKE (ABOUT 2 INCHES). TROUBLESHOT BRAKE SYSTEM A FAULTY CO-PILOT LT BRAKE MASTER CYLINDER. REMOVED AND REPLACED COPILOT'S LT BRAKE MASTER CYLINDER. BLED BRAKES LEAK & OPS CK WAS GOOD IAW CE560 MM CH 32-42-02.