AN ACR F100 FLC HAD A LOSS OF HYD FLUID IN THE #2 SYS AND THEY DECLARED AN EMER.

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FLT WAS OPS NORMAL UNTIL APPROX 20 MINS OUT OF YYZ. I NOTICED THE SYS #2 HYD QUANTITY WAS AT 39. WE BOTH WATCHED THE QUANTITY INTENTLY FROM THAT POINT ON. WE DISCUSSED POSSIBLE REQUIRED CHKLISTS IF THE QUANTITY WERE TO CONTINUE TO DROP TO AN ANNUNCIATED LOW HYD QUANTITY CONDITION. THE QUANTITY SLOWLY DROPPED TO 35. WE THEN WERE GIVEN AN EFC FOR YYZ; WHICH WOULD HAVE DELAYED OUR ARR AT YYZ BY 30 MINS. WE ALSO WERE GIVEN HOLDING INSTRUCTIONS AT WAYPOINT 'LINNING' 26 MI FROM YYZ ON THE ARR. AS WE ENTERED HOLDING; THE QUANTITY DROPPED QUICKLY FROM 35 TO 31. I DECIDED TO INFORM ATC OF OUR SIT AND I DECLARED AN EMER. YYZ ATC CLRED US DIRECT TO THE FIELD FOR APCH RWY 6R. WE DID ALL NORMAL CHKLISTS AND LNDG WAS UNEVENTFUL. WE CANCELED CFR AFTER CLRING RWY AND TAXIED TO THE GATE. TOTAL TIME FROM DECLARATION OF THE EMER TO LNDG WAS APPROX 10 MINS. YYZ AND APCH CTL WERE VERY HELPFUL IN HANDLING OUR ACFT WITH PRIORITY. THOUGH WE NEVER GOT A SYS #2 HYD QUANTITY INDICATION OF THE MFDU PANEL; I BELIEVE IT WAS NECESSARY TO GET OUR ACFT ON THE GND ASAP; NOT KNOWING WHETHER WE HAD AN ACTUAL HYD LEAK OR NOT.