I'll bet Tom is correct in his assumption that the brakes will loosen up, when you pull the booster away from the firewall. I know for a fact that the rods vary in length, so you might just have to pull the booster away, measure the difference in relation to the firewall, and take some length out of the rod. I'm sure I"ve made this reply clear as mud, but I hope it helps in some way...lol
TJ