What was found
AFTTER NORMAL LANDING AT VREF ON THE PAINTED AIMING POINT MARKERS, NORMAL BRAKING WAS APPLIED AND WORKING. SOMEWHERE BETWEEN 40 AND 50 KNTS, BOTH BRAKE PEDALS WENT TO THE FLOOR, SHORTLY AFTER THAT THE CAS BRK FAIL. EMERGENCY BRAKE WAS APPLIED AND SAFELY STOPPED THE AIRCRAFT ON THE RUNWAY. WORK ON DISCREPANCY STILL IN PROGRESS.