B757-200
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Landed in Emergency Condition; General Maintenance Action
Aircraft
20 Minutes prior to landing; the L HYD ENG PUMP EICAS message illuminated.  The Captain; pilot monitoring; complied the QRH procedures.  Once flaps 1 was selected the L HYD QTY EICAS message illuminated.  The Captain verified on the EICAS that the left hydraulic quantity was low and then complied  with the QRH procedures.  The configuration of the airplane continued as we approached the airport.  Flaps 30 was selected; but the flaps remained at 25 degrees and the TE FLAP ASYM EICAS message illuminated.  Additionally; the RUDDER RATIO EICAS message illuminated. The Captain complied with the QRH procedures and the airplane was landed.  Upon touchdown; it was discovered that the nose wheel steering was inoperative.  The Captain took control of the airplane at  around 40 knots and was able to get the airplane safely off of the runway and stopped.   ATC was notified that we were unable to taxi and needed to be towed into the gate. Maintenance towed the airplane to the gate. A hydraulic line in the left hydraulic system split causing the hydraulic fluid to drain out of the system.
B757 First Officer experiences a L HYD ENG PUMP EICAS message during descent; followed by a L HYD QTY EICAS message when Flaps 1 is selected. The approach is continued and when flaps 30 is selected; a TE FLAP ASYM EICAS and a RUDDER RATIO EICAS message appear. After landing the nosewheel steering is discovered to be inoperative and the aircraft is towed to the gate.