1973 roadrunner brakes
 

I have a 1973 roadrunner big project ill upload some pics later, but ive been working on my brakes for over a month now replacing the master cylinder brake booster brake lines calipers. My pedal does not return back to normal position, the car stops and all but the pedal stays to the floor i have to lift it with my foot. I cant find the reason for this and its not a return spring since its all vacum.
any help would be great
thanks

have you checked the brake booster for any leaks?