Narrative:

At the gate we were delayed as maintenance troubleshot a 'gushing' hydraulic leak - their description. They found a nut loose; repaired and sent us on our way. The leak was in the left system; which had dropped to .85; so it was serviced before we departed.[in flight] the antiskid light and EICAS message illuminated. Status page showed norm and altitude system had failed. We ran the QRH and tried to get hold of [dispatch]. Satcom did not work on either radio; multiple frequencies. We sent an ACARS message; and [dispatch] responded; was finally able to get through. By this time quantities had dropped from 1.0 to .93 (left) and 1.01 to .94 (right); hyd systems. Center hyd system remained 1.06 steadily. We ran the antiskid QRH; did the landing distance performance calculations; and talked to [dispatch] about where we could put it down on a dry runway. ZZZ was still looking and forecasting dry runways which held up.we reviewed options if quantities continued to fall.monitored the situation; watched quantifies drop to .92; but no further on left and right systems. [Advised ATC] and landed on the longest runway (13;000 ft) which allowed me to brake effectively with reverse and minimize use of brakes.QRH warned about potential for blowing tire; so we asked for equipment. After coming to a complete stop on runway; we were inspected and told nothing unusual. All indications were good in the cockpit so we taxied to gate and parked.

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Original NASA ASRS Text

Title: A B767 Captain reported that Maintenance repaired a hydraulic leak prior to departure; during cruise the hydraulic quantity started dropping.

Narrative: At the gate we were delayed as maintenance troubleshot a 'gushing' Hydraulic leak - their description. They found a nut loose; repaired and sent us on our way. The leak was in the left system; which had dropped to .85; so it was serviced before we departed.[In flight] the ANTISKID light and EICAS message illuminated. Status page showed NORM and ALT system had failed. We ran the QRH and tried to get hold of [dispatch]. SATCOM did not work on either radio; multiple frequencies. We sent an ACARS message; and [Dispatch] responded; was finally able to get through. By this time quantities had dropped from 1.0 to .93 (Left) and 1.01 to .94 (Right); hyd systems. Center Hyd system remained 1.06 steadily. We ran the ANTISKID QRH; did the landing distance performance calculations; and talked to [dispatch] about where we could put it down on a dry runway. ZZZ was still looking and forecasting dry runways which held up.We reviewed options if quantities continued to fall.Monitored the situation; watched quantifies drop to .92; but no further on L and R systems. [Advised ATC] and landed on the longest runway (13;000 ft) which allowed me to brake effectively with reverse and minimize use of brakes.QRH warned about potential for blowing tire; so we asked for equipment. After coming to a complete stop on runway; we were inspected and told nothing unusual. All indications were good in the cockpit so we taxied to gate and parked.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.