helping a friend with his fox body. car had power front brakes. now manual front disc brakes. car has all new hard lines and braided lines. car has a proportioning valve only on the rear brakes. car has a dual manual new master cylinder. when he called me, his hurst line lock was not disengaging the left front when you release the button. . only way to make it disengage was to open the bleeder. using the brakes normally, no sticking of any kind. replaced the line lock with another Hurst. same issue. left front stays locked after engaging the LL and then releasing the button. first line lock had one line split to the two front brakes. new line lock has separate lines to each front brake coming out of the LL. we determined that left front caliper was sticking after the line lock had been engaged.. took it to the maker and it was rebuilt. reinstalled the caliper, still only the left front would not disengage the caliper after the LL had been activated. we noticed that all the brakes lines had been replaced except one older rubber line on the left front from the hard line coming out of the LL to the caliper. got a new braided line and installed it. bled the brakes, pedal good, brakes working correctly. activated the LL. now the left front kind of disengages, meaning it drags more than it should. but the right front now does not lock up at all. we haven't changed anything on the right side since this started. it always worked like it should with the LL, meaning, it locked with the LL engaged and released when releasing the button. only the left stayed locked after releasing the button. now, having not changed anything on the right side, the right side will not lock at all with the LL engaged and the left now releases some. this is driving us nuts. Ideas???