Just put an ohm meter on the switch and check when pushing the pedal. Usually these switches have the reverse problem. Brake light on all the time. When you tighten the wire on the side of the switch it sometimes moves the contact on an angle not allowing the points to open.
I have been trying to get the light switch to work. Cleaned all the connection. Checked all the wires. Ran all wires direct and all lights work. When I get the switch plate back on the switch I can get the headlights to work playing with the switch on low beam. Horn works and brake light works...