Notice you are in Pensacola Florida. I am in Daytona Beach Florida. I had a new brake system ( rebuilt: Master , Booster, rear cylinders) all ruined after car sat for 3 years. It was the humidity in Florida. Over 80% humidity on a daily basis. Humidty / moisture gets into everything. Internally the booster has a complicated mechanism with bare metal parts that rust easily. When the mechanism doesn't slip and slide right due to a little rust , it won't work right. I've opened up adozen front calipers. These don't rust and bind up- they are Stainless Steel. Here moisture gets in Master cylinder and gets absorbed in brake fluid. Enough moisture rusts the master cylinder & brake lines ( after 40 years) . Particles of rust end up in the caliper to bind up the piston--causing drag. Moral of this is--these beasts need to be driven and driven often. Worst thing is to leave em sit.
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