69 Brake lights

[coach34]

Thank you all for having such a great forum. I have only had my truck for two weeks, but I already have fallen in love with this site. I have recently purchased a 69 c10. I have front and rear lights, all turn signals but I can't seem to get the brake lights working. My father in-law said I should have a switch that is pushed when the brake pedal is pressed, but the only switch I find at all is located just off the master cylinder. Any help would be greatly appreciated.