Stop in for a cup of coffee

Weird, was good last time I drove it. Has to be a adjustment. Hard as a rock, booster has vacuum from the pump. I did add rear disks a few years ago but ran it it was good after adjusting the prop valve. Thinking pushrod adjustment. Just a few other things first a lot of sitting gremlins.
Check for rust inside the master cylinder bowls. Brake fluid loves to absorb condensation.