COMMUTER ACFT HAS HYD WARNING LIGHT ACTIVATE DURING INITIAL CLB.

Narrative

AFTER TKOF FROM MIA UPON INITIAL CLB OUT THE MASTER CAUTION (YELLOW LIGHT) CAME ON. THE FO WHO WAS PNF IDENTED THE CAUTION LIGHT AS A HYD BLUE PUMP LOW PRESSURE. AFTER IDENT I DIRECTED THE FO TO COMPLETE THE NORMAL CHKLIST AND THEN TO COMPLETE THE PROPER CHKLIST FOR THE HYD BLUE PUMP LOW PRESSURE. WHILE THE FO ATTENDED TO HIS DUTIES I (PF AND THE CAPT) CONTINUED TO FLY THE ACFT AND COMMUNICATE WITH ATC. I MADE THE DECISION TO RETURN TO MIA INTL ARPT. WE WERE VECTORED BACK AROUND FOR AN ILS TO RWY 9R AND LANDED UNEVENTFULLY. THE WX WAS APPROX 1500-1800 FT BROKEN TO OVCST; VISIBILITY BTWN 5-6 MI AND IT WAS AT NIGHT. THE PROB WAS WRITTEN UP IN THE LOGBOOK PRIOR TO ME ACCEPTING THE ACFT. THE MAINT PEOPLE HAD GND CHKED THE ACFT AND COULD NOT DUPLICATE THE PROB AND CLRED IT. WHEN I TOOK THE ACFT I CHKED THE LOG AND SAW THE WRITEUP AND THAT IT WAS CLRED. SO I ACCEPTED THE ACFT. THE PROB THEN REOCCURRED. CREW INTERACTION AND COCKPIT RESOURCE MGMNT RAN SMOOTHLY AND ALL CHKLISTS AND PROCS WERE COMPLIED WITH.