Gentlemen, I know I've asked this question before, but I would like to ask again. I have four wheel disc brakes with power booster on the master cylinder. What brakes should lock up first, rear or front? Right now I have the proportioning valve to the rear brakes. I've decided to revamp my brake lines, so before I complete this task I would like some advise on where I should put this valve. Rick, your advise would be well appreicated.