Line Lock problems!!!!!

might help to know how old a car ur working on. Sounds like u don`t have installed right, or air in the pass side line (which is harder to get out than the short drivers side)) or ur working thru some later model splitting block. Can u post a drawing on here? ( I couldn`t ) , but it would help.
This is the 1970 duster in my avatar. It is the factory porp. valve, original equipment for a disk brake 340 duster