i had a couple pinched brake lines up front just after the proportioning valve the lines are right under that hole in the crossmember where you can wrap a chain. any how i cut out part of the line that was pinched front and back. and was told that i messed up proportioning valve by not pressing the button on it so i removed it thinking auto zone would have one but they dont stock that part mine looks ok i think i got lied to by mechanic and want to know how i should go about fixing this major fing problem. i need my truck on the road