Re: Brake light stays on
check your existing switches with a multimeter.
I have just checked the manual and the switches are NO (normally open) contacts and the lever changes the state to closed, therefor...there should be continuity when the lever is pulled in or the rear pedal pressed.
if you release the lever or pedal, there should be no continuity through the switch.
i would also say its something to do with your integrated tail light as if you have disconnected all the switches the light should be off