Had the same problem with my '79 (sat for abt. 2 yrs. before I purchased it)
Could be the master cylinder, power assist booster, vacuum pump, or maybe just the calipers stuck with a little rust on the piston. Don't fork out a lot of money just replacing parts....
If you are in the US, and have an Autozone nearby, they stock or can get most of the brake components overnight to their store... relatively cheap, too!
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