A MIL SABRELINER-40 (T39B/D) ACFT BRAKE LINES WERE RE-INSTALLED IN REVERSE (CROSSED). LEFT PEDAL OPERATED R BRAKE AND R OPERATED LEFT BRAKE.

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THE ACFT INVOLVED IS A MIL SABRELINER THAT OUR COMPANY HAS A MAINT CONTRACT TO DO ACFT CONDITION INSPECTIONS ON. THIS INVOLVES DISASSEMBLY OF THE ACFT WITH A COMPLETE WING DEMATE; SYS OVERHAUL AND STRUCTURAL OVERHAUL. I WAS GIVEN THE ASSIGNMENT TO REINSTALL HYD LINES THAT WERE REMOVED FOR ACCESS FOR MAJOR STRUCTURAL WORK THAT HAD BEEN COMPLETED. THE ENDS OF EACH HYD LINE HAD BEEN CAPPED AND TAGGED WITH AN IDENT TAG MARKING IT TO ITS PROPER PORT. I HAD ATTACHED EACH LINE TO ITS PROPER PORT AND DOUBLE-CHKED EACH ONE BEFORE REMOVING THE TAGS. THE SABRELINER MAINT MANUAL DOES NOT CLRLY SHOW WHICH LINE GOES TO WHICH PORT. 4 MONTHS LATER THE ACFT HAD COMPLETED ITS OVERHAUL AND REASSEMBLY AND HAD GONE THROUGH ALL OF ITS POST OPERATIONAL CHKS AND HAD COMPLETED ITS TAXI TEST. THE ACFT WAS TURNED OVER TO THE MIL TEST PLTS FOR LIGHT TEST. ON THE THIRD TEST FLT DURING THE LNDG ROLLOUT THE BRAKES WERE FOUND TO BE OPERATING IN REVERSE; MEANING THE R BRAKE PEDAL OPERATED THE L BRAKE AND THE L BRAKE PEDAL OPERATED THE R BRAKE. THE ACFT LANDED AND RETURNED TO OUR MAINT FACILITY UNDAMAGED. FROM THE TIME I INSTALLED THE HYD LINES IN QUESTION; I WAS ASSIGNED TO ANOTHER ACFT AND THE ACFT IN QUESTION CONTINUED THROUGH 4 MONTHS OF MAINT; OVERHAUL AND REASSEMBLY. THERE IS THE POSSIBILITY THAT THESE LINES HAD BEEN TAGGED INCORRECTLY AND THE POSSIBILITY THAT THESE LINES HAD BEEN DISCONNECTED AND RECONNECTED FOR OTHER MAINT AFTER I HAD INSTALLED THEM. IT IS OUR COMPANY POLICY BEFORE HYD LINES ARE DISCONNECTED THAT EACH END BE TAGGED WITH A METAL IDENT TAG TO PROPERLY IDENT WHAT PORT IT GOES TO. ACFT MAINT IS SOMETHING THAT I TAKE VERY SERIOUSLY AND I KNOW THAT I HAD CHKED AND DOUBLE-CHKED TO MAKE SURE THAT THESE LINES WERE CONNECTED TO THE PROPER PORTS AS THEY HAD BEEN TAGGED. IT'S HARD TO BELIEVE THAT AFTER ALL THE FINAL POST OPERATIONAL CHKS AND THROUGH SEVERAL TAXI TEST THIS PROB WAS NOT DETECTED UNTIL THE ACFT RETURNED FOR LNDG ON ITS THIRD TEST FLT. I FEEL THE SABRELINER MAINT MANUAL NEEDS TO BE UPDATED TO CLRLY SHOW IDENT OF HYD LINES AND PROPER PORTS. ALSO OPERATIONAL CHKS NEED TO BE CALLED OUT FOR TESTING THE BRAKES FOR PROPER OP. THESE CHKS NEED TO BE REVIEWED TO SEE WHY THIS PROB WASN'T DETECTED.