Air carrier technician reported finding a B767-300 tire with a flat spot with a history of several tire changes. During troubleshooting and further inspection; they found the hydraulic lines crossed.

Narrative

No. 4 Wheel Assembly (ASSY) was found flat spotted on arrival to ZZZ [on] Day 0. On investigation the wheel had been changed recently. On further investigation the wheel ASSY had been changed 6 times. After initial troubleshooting the antiskid module was ordered and was due to arrive at XA:30 on the Day 1. The oncoming day shift carried out the normal antiskid function test again to confirm fault before replacement of module. During function test it was noticed the actual brake releasing during the test was the opposite wheel assembly. So; wheel test for No. 3 released No. 4 and vice versa. We proceeded with hydraulic line inspections and found that the forward brake hydraulic lines for Brakes 3 & 4 had been cross-fitted causing the wrong brake to release during normal antiskid operation. The R/H Main Landing Gear Bogie has had over 2 years of high brake temp issues & No. 4 wheel has been changed 8 times in total.