As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SPRING AROUND MASTER CYLINDER SHAFT HUNG UP TO BURR AND DID NOT EXTEND TO HOLD THE PARKING BRAKE LEVER DOWN AGAINST TOP OF CYLINDER. PREVENTING APPLICATION OF PARKING BARKE BY NATURAL MOTION OF RUDDER PEDAL IN FLIGHT. BRAKE LOCKED DURING FLIGHT UNKNOWN TO PRIOR.