The only thing i could think of is that you bought a bad switch(happend to my TWICE), or that you didnt adjusted the switch close enough to contact with the plate or that the bolt that presses in the switch when not braking is loose and need to be tightend which is a bitch to do. Its also good to have some one standing behind your car to tell you when the switch activates and deactivates when adjusting the switch.
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SUSPENSION>Power
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