As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT BRAKE FAILED DURING TAXI. RIGHT COCKPIT BRAKE PEDAL FAILED TO MAINTAIN BRAKE PRESSURE TO RT MAIN WHEEL BRAKE. LT PILOT TOOK CONTROL OF THE ACFT AND BRAKING ACTION APPEARED TO BE SOMEWHAT NORMAL FOR THE REMAINDER OF THE TAXI. RT BRAKE DID SEEM SOFTER THAN THE LT. FLUID LEVELS WERE NORMAL ON POST FLIGHT. R & R CO-PILOTS RT MASTER CYLINDER. TORQUED AND SAFETIED, BLED BRAKES. OPS AND LEAK CHECKS GOOD. DONE IAW MM 32-42-02 AND 32-42-00.