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Old 08-22-2012, 08:35 AM   #1
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Brake Pad Wear Sensor ??

I was working on a 2003 330CI the other day and noticed that the rear passenger side brake pad wear sensor wire was snapped in connection. Yet the brake pad warning light on the dash board was not displaying. Other than a fuse problem what else could cause the light not to come on. Your thoughts greatly appreciated
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Old 08-22-2012, 09:15 AM   #2
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It's possible that two metal bare ends are sticking out and are touching, completing the connection. It's also possible that the light is out. Do an instrument cluster test to see if it lights up.
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Old 08-25-2012, 12:13 PM   #3
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I believe it works by wearing through the little nub of the sensor as it reaches the wear limit, and then completing the connection triggering the warning.

If the sensor is missing, or broken as yours is... there is nothing to trigger the light unless the circuit is completed. A broken sensor appears the same to the car as one on a good pad. The sensor itself is consumable and only a few dollars. You should be able to verify the function of the warning light by completing the circuit yourself, but you'll have to follow the reset procedure to get the light to go out.
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Old 08-25-2012, 12:24 PM   #4
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I think it's the other way around, because if you want to skip the sensor all together you place a wire in the socket to complete the connection, therefore keeping the light off your dash.
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Old 08-25-2012, 01:21 PM   #5
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Ahh, yes, looking at the Bentley diagram it looks like you may be right.... think it breaks the circuit once the nub gets worn away, triggering the light.
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Old 08-25-2012, 02:17 PM   #6
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Correct. Sensor grounds out when touching rotor, completing circuit. Broken wire, no way for sensor to complete circuit.
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brake, sensor

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