brakes are not working properly. diagnosed as left front hub speed sensor. i also understand there can be a problem with a 'pigtail' wire harness connecting the computer to the ABS hub unit. since vehicle was diagnosed, brakes have worked fine. which of these problems would be the most logical? i have purchased the wheel sensors, but i was needing the part # for the pigtail harness. from my research, the pigtail seems to be the most likely culprit. i would appreciate your input.