A B777 HAD A #1 FORWARD BRAKE ASSEMBLY REPLACED ON MAY WED 2000. 7 FLTS LATER ON MAY FRI 2000 THE BRAKE HYD LINE WAS FOUND DISCONNECTED.

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WORKED ACFT XYZ (B777); 'DEFERRED INOP' FOR #1 BRAKE ASSEMBLY FOUND LEAKING. HYD PRESSURE LINE DISCONNECTED AND SECURED WITH TIE WRAPS. I REPLACED THE BRAKE ASSEMBLY PER ACR MAINT MANUAL 32-45-07; REMOVED TIE WRAP FROM LINE AND SECURED ON BRAKE ASSEMBLY WITH FITTING. PRESSURE LEAK CHK AND SET BRAKES. CONFIRM BRAKES WERE SET AND ACTUATION WITH CO-WORKER. NO LEAKS FOUND ON FITTING CONNECTION. NOW; 7 LEGS LATER IN XXX FLT ABC; MAY/FRI/00; MECH FOUND LINE DISCONNECTED. I SUSPECT THE SPRING TENSION ON QUICK DISCONNECT OR 'TANGS' (PINS) THAT SECURE FITTING; ON BRAKE ASSEMBLY AT FAULT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE QUICK DISCONNECT FITTINGS ON THE BRAKE AND HYD LINE APPEARED AND ACTED NORMAL ON INSTALLATION. THE RPTR SAID THE BRAKE WAS PRESSURIZED AND ACTUATED SEVERAL TIMES FOR LEAK CHKING. THE RPTR STATED NO LOGBOOK RPTS WERE NOTED IN THE 7 FLTS ON BRAKING OR ABNORMAL TEMP INDICATION. THE RPTR STATED IT IS POSSIBLE THE DISCONNECT COULD HAVE BEEN STRUCK BY SOME OBJECT OR THE SPRING TENSION ON THE LINE CONNECTOR WEAKENED OR BROKE.