What was found
ON FINAL APPROACH TO MCI, EICAS INDICATION MESSAGE HYD QTY 2 LOW. CREW CHECKED QTY SAW IT WAS ERRATIC BUT STABLE. CREW OPTED TO GO AROUND AND RUN THE CHECKLIST. THE CHECKLIST STATED ITS JUST AN ADVISORY MESSAGE, ALSO RAN THROUGH THE NO FLUID QUANTITY JUST AS A PRECAUTION TO BECOME FAMILIAR WITH IT IN CASE SYSTEM WAS COMPLETELY LOST. LANDED FLAPS FULL AND ONCE THE REVERSE AND SPOILERS DEPLOYED STEERING BECAME REALLY SLUGGISH BUT STILL WORKED. DISCREPANCY WROTE UP, MAINT WAS DISPATCHED AND SERVICED NR 2 HYD SYSTEM PER EMB AMM. AC RELEASED FOR FLIGHT.