B737-800
Flight Crew Last 90 Days 200; Flight Crew Total 13000; Flight Crew Type 8500
Aircraft Equipment Problem Critical
Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport; General Declared Emergency; General Maintenance Action
Aircraft
At cruise flight 38;000 FT; 130 west of ZZZ Master Caution light came on Engine # 2 hydraulic low pressure light. Ran the QRH and declared an emergency. Diverted to ZZZ and landed overweight at 135;000 LBS. Upon arrival at the gate the Hydraulic System B quantity indication showed RF [Re Fill].
B737-800 reports loss of B Hydraulic System fluid and a resulting low pressure indication at FL380. Flight diverts to the nearest suitable airport.