Hi. I started out driving and my power brakes worked great, but sometimes the pedal gets hard after I drive it for a while. I can drive it for ten miles or more and it works perfectly. Is there any way to ID to power brake boosters if I need to get one and where is the best place to get one? Also, does anyone know where I can get a check valve? The one I have has two fittings. One fitting to a vacuum gauge. And the gauge says I have thirteen to fourteen lbs. of vacuum. Thanks. I have a 1970 GTX btw.

“Working on cars teaches you patience... and every curse word imaginable.”

1970 Plymouth GTX -- A true gentleman's coupe, but a serious muscle machine.