As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI-OUT, CO-PILOTS RIGHT BRAKE PEDAL GOES TO THE FLOOR WITH MINIMAL BRAKE EFFECTIVENESS. AFTER PUMPING BRAKE PEDAL, FULL PRESSURE RETURNS TO BRAKE PEDAL. HOWEVER A SHORT TIME DELAY RETURNS RIGHT BRAKE PEDAL TO SAME CONDITION. BLED BRAKES & ANTI-SKID SYSTEM TO REMOVE ALL AIR IAW CE560 M/M CHAP 32-42-00. BRAKES OPS CHECK & LEAK CHECK GOOD.