The power booster runs off vacuum, not air pressure. Either way, if this unit is bad, which I doubt, it won't make your pedal go to the floor. You have air in the brake system. The best way to remove that much air is with a pressure bleeder. A pressure bleeder attaches to the top of your master cylinder and forces fluid through the brake lines as you bleed them one at a time. You can try having someone pump and hold the pedal for you as you bleed each wheel, but it sounds like your master cylinder is airlocked.
Sunday, December 14th, 2008 AT 7:55 PM