You can not adjust the brake light switch, they are self-adjusting after installation.
But maybe the spring in the pedal assembly is weak?

 

Good Day ; Not sure but I Have adjusted switch , If you pull the plastic plunger outward it will click several times depending how for you pull , You might be right , To cold right now to mess with a plastic switch . Hopefully I am right and I dont have to buy new switch . I can always put a Bungie on it , HAHA I just want to GO .

 

If you have a stock switch I do doubt that it was adjustable- take a look at
https://s3.amazonaws.com/cdn.genosga...AA_Install.pdf

 

Good Morning All ; Replaced Clock Spring and adjusted brake light switch and Bingo Cruise is working again Should make Vacation Drive a bit smother , Hope you all have a Merry Christmas