1950 Ford Thunderbird have to press very hard to get the brake lights to come on
If I remember right these old birds used a hydraulic switch out by the master cylinder, you can try loosening up the switch as someone slowly pushes the brake pedal down and watch for any air bubbles that may appear around it and then tighten it up when the bubbles stop, just make sure the person doesn't release the pedal until you get it tight or you will get air in the brake system, then see if the lights act better, if not then the switch will have to be replaced.
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