What causes tail lights to burn with switch off?

I hired a mobile mechanic to come and check out the problem. On the brake pedal above the line of sight there is a small plastic button that pushes the switch on the brake light module to disengage the connection. (It's like flipping am off/on light switch for a room.) Of course being a 92 model the mechanic didn't have the plastic button so we took gorilla instant glue and glued the button back together. It worked for 2 weeks and the button broke again (so much for instant gorilla glue). I found a plastic pin that holds up upholstery and put it through the hole on the brake pedal arm and it works. If this thing doesn't last long I will use a small carriage bolt until then I was able to repair my own issue.