Question about brakes.

[Ltcrazyx]

I probably already know the answer to this but was just wondering. I am thinking about replacing everything on my truck for the braking systems the line the drums you name it. Do you think think that possibly I could get away with using some of the older parts and keeping them so I save some money? I mean I know this the trucks been sitting sense 71 and hasn't run. So I just naturaully figured I should replace everything on the brake system. Does anyone have any tips of telling how I wouldn't have to replace something and possibly save money? Thanks in advance.