What was found
WHILE EN-ROUTE FROM KACY TO KTPA, THE FLIGHT CREW RECEIVED A WHITE MAIN HYD QTY LOW ADVISORY. APPROXIMATELY 50 MINUTES LATER, MAIN HYDRAULIC SYSTEM PRESSURE BEGAN FLUCTUATING AND SUBSEQUENTLY DECREASED STEADILY. THE CREW DIVERTED TO KJAX AND DECLARED AN EMERGENCY. A MAIN HYD PRESSURE CAS MESSAGE WAS SUBSEQUENTLY DISPLAYED. AS HYDRAULIC PRESSURE CONTINUED TO DECREASE, THE CREW ACCOMPLISHED THE APPLICABLE QRH PROCEDURES, EXTENDING THE LANDING GEAR VIA THE FREE-FALL SYSTEM AND SELECTING FLAPS 20°. A RED NORMAL BRAKES FAIL CWP WARNING AND A RED BRAKES FAIL CAS MESSAGE WERE THEN DISPLAYED. THE CREW CONDUCTED A VISUAL APPROACH TO RUNWAY 08 AT KJAX. FOLLOWING TOUCHDOWN, NORMAL BRAKING WAS AVAILABLE AND THE AIRCRAFT WAS BROUGHT TO A SAFE STOP WITHOUT FURTHER INCIDENT. THE AIRCRAFT REMAINS AT KJAX PENDING MAINTENANCE INSPECTION AND TROUBLESHOOTING TO DETERMINE THE SOURCE OF THE HYDRAULIC FLUID LOSS AND RESULTING PRESSURE DEGRADATION.