If all the brakes are binding up when hot, it's the master cylinder not fully returning.
Inside the master cylinder, there is a tiny hole that opens the system to the fluid reservoir when the pedal is released. If the MC piston fails to fully return, that hole remains closed, and the system builds pressure from the fluid heating and expanding.
It can be caused by a mechanical binding or improper adjustment of the pedal, or the master cylinder piston binding in the bore due to corrosion, or the wrong fluid has been introduced to the system and has swollen the cups.
If it has been stored, or just been many years that the brakes have had any service, chances are they will all need to be taken apart and gone through. Do it now and save the shoes/pads from getting fluid soaked.
If it's had the wrong fluid introduced, bad news! Everything will have to come apart and be flushed. ALL rubber components, including hoses, replaced.
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