The prop valve has NPT threads and takes the correct adapter to mate the brake line to. The brake line fitting doesn't go directly into the PV. Any good auto parts store should be able to hook you up. Once your leaks are history, you need to go out to a safe area of road and do some maximum effort braking, while dialing in more rear brake bias, until you just start to lock the rears; then back off to where the lockup stops.