A BA4100 FLC EXPERIENCES A PRIMARY SYS HYD FLUID LOSS. PIC REQUESTS DELAYING VECTORS FOR ARR AND REQUESTS EMER GND EQUIP. HE ALSO FILLS IN APCH CTLR WITH ALL THE OTHER INFO RELATED TO AN EMER SIT BUT NEVER DECLARED AN EMER SIT.

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DURING PREFLT INSPECTION; DEP AND CRUISE; NO PROBS FOUND AND ALL THE ACFT SYS PERFORMED NORMALLY. ABOUT 25 MI FROM OUR DEST (PIT); DSNDING THROUGH 11000 FT; WE NOTICED THE HYD RESERVOIR CONTENTS GAUGE WAS FLUCTUATING BTWN EMPTY AND 1/8. WE RAN THE CHKLIST AND FOLLOWED THE PRESCRIBED PROCS. ATC WAS ADVISED WE HAD A HYD PROB; AND DELAYING VECTORS WERE REQUESTED TO ACCOMMODATE THE VARIOUS CHKLISTS AND CREW/ACMP/CABIN CREW/PAX BRIEFINGS. EMER WAS NOT DECLARED; AS WE DID NOT REQUIRE PRIORITY TO THE ARPT. THE FOLLOWING WAS COMMUNICATED TO ATC: NATURE OF THE PROB AND THE POSSIBLE EFFECT ON OUR NORMAL BRAKING SYS; THE NEED FOR THE RESCUE AND FIRE VEHICLES TO WAIT FOR US UPON LNDG; SOULS AND FUEL ONBOARD; AND THE FACT THAT WE WILL NOT CLR THE RWY AFTER LNDG. THE GEAR HANDLE WAS SELECTED DOWN (NORMAL HYD SYS) AND WE HAD 3 GREENS. CONSIDERING THE UNCERTAINTY OF THE HYD SYS AND THE RWY LENGTH (10500 FT) A ZERO FLAP LNDG WAS EXECUTED UNEVENTFULLY. PAX WERE DEPLANED ONTO A BUS. DURING POSTFLT INSPECTION HYD FLUID WAS NOTICED DRIPPING FROM THE L ENG. LATER; MAINT ADVISED US THAT THE L ENG DRIVEN HYD PUMP HAD FAILED AND THAT WAS THE SOURCE OF THE LEAK.