Hi Hannah. I was just working on the brake light wiring on my 29 model 65. You should have a two filament bulb in the back. If you follow the wiring from the back light along the frame toward the front, you will come to an actuator switch. It has a spring leading to it with the other end attached to a rod connected the foot brake. I just had to clean the electrical connections and adjust the spring tension. Good luck with yours.
Where Are You From? Murrieta, CA
Do You own a car built by Durant? 29 model 65 coupe cabriolet