What was found
HYD QTY LOW C AT 4:21 INTO FLIGHT FOLLOWED BY RESERVE BRAKES/STRG. HYDRAULIC QUANTITY CENTER DECREASED FROM .41 AT TIME OF EICAS TO .30 BY END OF FLIGHT. ALL SYSTEMS FUNCTIONED NORMALLY ON APPROACH, LANDING AND TAXI. ON BLOCK IN FOUND #5 BRAKE LINE LOOSE AND LEAKING AT BRAKE, HYD FLUID POOLED IN LEFT WHEEL WELL WHERE #5 WHEEL RESTS WHEN STOWED. CLEANED ASSOCIATED AREA TIGHTENED BRAKE LINE, RESET ANTISKID VALVE FUSE, SERVICED HYDRAULIC SYSTEMS TO FULL, PRESSURIZED HYDRAULICS AND PERFORMED LEAK CHECKS WITH NO LEAKS NOTED, BRAKES OPERATE NORMALLY REFERENCE B777 AMM 12-12-01-3, 32-41-00-2, 32-45-07-4. OK FOR SERVICE.