Any insite? 99 mustang gt vert with abs, My driver side front caliper will not release line pressure when brake pedal is released. (locks up tire while driving) will only release from rotor when bleeder screw is cracked and pressure released via that way. Caliper is good, remain just put it in because pistons were locked up in old caliper.( i think the root cause was the same problem as this) Slider moves freely. New rubber line, seen old one was not collasped upon removal. new fluid, bleed line 4 times. What the heck? What do i check from here and how do i check it? thanks a million!