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      01-31-2013, 02:39 PM   #4
TitanLH8
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Drives: 07 E90 335i
Join Date: Feb 2011
Location: Los Angeles

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From my understanding, the brake pad sensor has two wires for resistive feedback. When the brake pad wears down enough to the point the sensor grinds on the rotor, it wears out one of the wires, hence the yellow warning light. If you leave it, it will continue to grind as the brake pads wear down until the second wire is tripped and a red warning light will be displayed. Once you trip the brake sensor, you have to replace it otherwise, the computer will always see the sensor as being worn down, even if you replace the pads.
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