Don't the pedals all fit to the cross bar with a nylon bush? It could be that is worn maybe?
Ah ok... well in that case what on earth is causing them to be stuck on? Basically at the moment whatever pushes down on the plunger/switch is not pushing down far enough to turn the lights off when not braking so any ideas what the problem could be?
Shouldn't there be a return spring where the the pedal shaft rotates on the main lateral shaft? Maybe its broken or dislodged:dunno:
You'll need to pull on the switch further out of the housing. It's selve adjusting in the other direction Just pull the stem.
Kara if the plunger is out of adjustment, glue a small washer on top of the mating face of the pedal, this will give you some more adjustment