On top of the brake pedle there is a a swith, with a connector going to it. You can adjust the switch by screwing it further down so it makes better contact with the pedle arm. Its suposed to be set so that the switch is pushed in right on the edge of turning off the lights, so that any tiny movement of the pedle will have the lights come on.
I would guess your switch isnt making good contact, so get under there and screw it further in.
Hope that helps.
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