Reminds me of a problem I just solved on my beater Dodge Shadow... Upon braking, the car would pull to the right for a second, and then hold straight. Like the left caliper was slightly delayed. So, I tried to bleed the brakes thinking there must be a bubble in its line or something. All was fine until I went to do the left one- with the bleeder wide open, the pedal was WAY firmer than with the others. Clogged line I figured. Replaced it, and no change. Finally I got frustrated, yelled a profanity and smashed my foot on the brake pedal as hard as I could. It resisted for a second, and then gave away. Now the pedal had the same action as for the other three wheels. Bled that line real good until I saw a couple clumps of glop (technical term) coming through the line. Now the car stops straight and true.
Another example where determination, profanity and excessive force solve a problem.