This work is on a 74 scout ii with 345/727 auto. I recently installed new power brake booster/master cylinder and rear brakelines as well as wheel cylinders and shoes. I bled the vacuum off of booster and then bled all 4 wheels in order from rear passenger to front driver. When i start it up the pedal sucks down and is hard. But when i turn off scout the pedal releases...does anyone have any info to help? I have owned 7 various scouts before this old girl, doing 90% of repairs myself and never had these issues. Any help is appreciated