Brake lights don't brighten when press down brake petal on 1998 Mazda B3000

Rear brake lights come on when I turn on the lights but do not brighten when I press down the brake petal. Not bulbs or fuse, please help?

Asked by for the 1998 Mazda B3000
My first thoughts are it is either a fuse or the brake light switch.
1 more answer
I'd say the brake light switch located behind the pedal arm