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Because they tell you when your brakes are out? It's one of those "I drive a BMW and are lazy features" I dont see why if you have it why you wouldn't want to use it. The sensor should be plugged INTO the brake caliper. At least that's how it was on my E46, basically as it wears it gets to the point were the pads dont cover the sensor anymore and the rotor wears away a little of the sensor and it trips the signal.
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