If I'm not mistaken, the way the brake sensor works is when your brake pads get too low the red covering is sheared away by the rotor completing the circuit and triggering the brake wear light on the dash. If you install non-OEM pads without the notch, tie back the sensor and the indicator light will not be triggered ( at least this is what it looked like when I did my brakes a couple of months ago - hence the reason that if the light is triggered you need to replace the sensor ).
Hope this helps...
Nick
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