Emergency brake light on 92 chevy blazer

Their must be switch somewhere at the back of the pedal that touches earth when you apply the brake ,put you glasses on get a torch and have a look.Never worked on one or evan seen one of these motors so i cant tell you where it is but it will have one and on an old vehicle like this it will be simple

There is a problem with the switch on your parking brake. my suggestion is, disassemble the switch and test with a multimeter if it's busted then replace it or repair the switch if you can.

There is a pressure switch, that gets depressed or released due to pedal position. When you engage the PB the arm is depressed...releasing the pin-like pressure switch.

Examine the pedal itself...looking where it 'touches' the car.
Depress the pedal....while watching this place. Look for a 'pin-like' switch that is allowed to extend when the parking brake is engaged, and that would be depressed in when the arm is released/disengaged.

Once you have found this, it is likely that either the:

1. arm is slightly misaligned and does not depress the button..ie. the light stays on
2. if it is lined up...then perhaps it does not depress the button far enough...press it to see if they light now goes out
3. once you confirm that the light will go out..then you can adjust the physical location of the switch so that the brake pedal arm, more fully engages it