[whitty]

The power (brake) assist apparently works with vacume from the engine on my 86 Wrangler. I had the same problem but it seemed to be mostly solved by replacing a few vacume hoses. Then again it may be a little different on newer models... but my pedal doesn't have nearly as much travel as it used to. By the way, my brake pedal was fine when the ignition was off, as soon as the truck was started the pedal would sink right to the floor.