Below (at bottom), I found what should be a picture of your brake light switch.
It could be a defective switch
or
It may just have a "mounting" problem.
My Jeep's switch is similar to yours.
I am linking you to a post where I explain what could be wrong. See my answer's in this link.
https://www.2carpros.com/questions/1979-ford-f-100-brake-light-switch
Return here (this thread) and let us know what you found.
The Medic
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Sunday, January 21st, 2018 AT 5:46 PM