As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 7202: LOSS OF NORMAL BRAKING UPON LANDING: UPON LANDING AT SITKA, FIRST OFFICER'S RIGHT HAND BRAKE FAILED TO ENGAGE AND BRAKE PEDAL WENT TO FLOOR. CAPTAIN'S BRAKES OPERATED PROPERLY AND HE CONTROLLED THE AIRCRAFT DURING TAXI TO THE RAMP. FAILURE WAS DETERMINED TO BE THE ASSOCIATED DUAL BRAKE MASTER CYLINDER. ASSOCIATED DUAL BRAKE MASTER CYLINDER WAS REMOVED AND REPLACED WITH A SERVICEABLE UNIT IN ACCORDANCE WITH ATR JOB INSTRUCTION CARD 32-42-13 RAI10000. CAUSE OF MASTER CYLINDER FAILURE UNKNOWN AT THIS TIME.