What was found
DURING DECENT, CREW NOTICED LOW LT AND RT HYDRAULIC PUMP PRESSURE ANNUNCIATORS ILLUMINATED. CREW EXTENDED GEAR AND FLAPS AND DECLARED EMERGENCY BEFORE LANDING. CREW USED NITROGEN BOTTLE FOR BRAKING. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND A SPLIT ORING ON THE LH BRAKE ASSEMBLY FORWARD SIDE PLUG. MAINTENANCE REPLACED BOTH PLUG ORINGS ON LH SIDE, REPLACED BOTH HYDRAULIC PUMPS, REPLACED BOTH HIGH PUMP PRESSURE FILTERS WITH NEW AND INSPECTED THE REMOVED FILTERS AND DID NOT FIND ANY DEBRIS TO NOTE. SERVICED HYDRAULIC SYSTEM AND BLED. MAINTENANCE ALSO CONDUCTED A SATISFACTORY OVERSPEED INSPECTION DUE TO GEAR AND FLAPS BEING EXTENDED AT 230 KNOTS. ALL FUNCTIONAL CHECKS SATISFACTORY.