As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI PILOT APPLIED BOTH BRAKES. THE RIGHT PEDAL WENT THROUGH FULL TRAVEL AND THE LEFT PEDAL ACTIVATED THE BRAKE. THE AIRCRAFT SPUN QUICKLY TO THE LEFT AND WENT OFF OF THE TAXI WAY. THE MAINTAINERS DISCOVERED A BROKEN O-RING IN THE RIGHT BRAKE MASTER CYLINDER.