total brake failure 70 impala

I was given a 70 impala 2dr with 350 2brl, it needed a tune up and has no brakes I cant find any leakage from the cylinders nor from master cyl. anyone have any suggestions, I'm desprete .

I have a 1970 Impala Custom also 2 dr 350. I almost at brake failure myself. Was wondering if anyone knew of a good 4 wheel disc brake kits for a 70 Impala or a website I can check out. Spread the knowledge my sons