No the caliper is not sticking , no leaks , brand new rotors. The truck does have ABS the wheels don't lock up seems to be working. How do I go about checking the proportioning combo valve ?

One guy said that if the frontend was out of line that it would pull like this , but the guys at the Ford garge said that it shouldn't pull even if the wheels were out of line. But I had the frontend checked and the machine said its in the green so its close.