As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, AFTER LANDING, CREW NOTED LOSS OF BRAKING ACTION FROM THE PILOTS AND COPILOTS RT BRAKE PEDAL. BRAKING ACTION WAS RETURNED AFTER REPEATED PUMPING OF THE PEDAL. MX FOUND POWER BRAKE ANTI-SKID CONTROL VALVE FAILED. THE UNIT WAS REPLACED.