What was found
ON FLIGHT 4057 THE CREW REPORTED THEY RECEIVED A "HYD 1 LOW QTY" AND MFD HYDRAULIC PAGE CONFIRMS HYD SYS 1 QTY IN AMBER LOW RANGE. REPEAT WRITE UP. THE CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NR 4 BRAKE SHUTTLE VALVE IAW EMB AMM 32-49-03. ALSO REPLACED NR 4 SHUTTLE VALVE OUTER BRAKE HOSE IAW EMB AMM 32-49-03. NO LEAKS FOUND AT THIS TIME. OTHER PARTS REMOVED AND REPLACED: PART HOSE BRAKE, PART NUMBER AE713800-1. PART TYWRAP, PART NUMBER PLT4S-M76. PART PACKING, PART NUMBER 68-404. THE AIRCRAFT WAS RETURNED TO SERVICE.