As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING TAXI THE RIGHT BRAKE IS STICKING. WHEN RELEASING BRAKES THE RT-SIDE TRIPLE INDICATOR SHOWS RESIDUAL PRESSURE. WHEN BREAK PEDAL PRESSED THE BREAK RELEASES ALLOWING THE AIRCRAFT TO MOVE. THE BREAK GRABS WHEN BREAK PEDAL IS RELEASED. MAINTENANCE REPLACED THE SHUTTLE VALVE 2578GM PER AMM 32-45-16. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.