91 drggn dime
+1y
my 91 still does it. The metal ring that holes the brake light switch in place, over time eats the plastic threads off and it slides back, just reach under there and push it forward till you can buy another one.
As for the bulbs.. s10's are notorious for 1 ground in that entire 'chassis harness' being off, your lights wont blink, or will blink weird, or will stay on, or your brakes will light up, wont light up, etc.. 1 little ground not being perfect, will throw it ALL off.