Brake Question

[MyDream55]

Hello all-

Recently I purchased a power disc brake upgrade kit and installed it.. The only problem I am having now is the brake pedal will not come back up when pressed in. It is a new booster, master cylinder, prop. valve, disc brakes up front, and new brake lines. I ran a vacuum hose from the back of carburator.

I also re-installed the spring and greased the fitting the pedal is attched to. The brakes stop perfect but I keep having to pull it back up with my foot. Anybody have any ideas what it could be or what I can check?

Thanks for the help.

Also , it is a 56 stepside with a 350.