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Old 07-20-2005, 09:23 AM
skiier3_9's Avatar
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Brake pad wear indicator light troubles

In my 94 w124 e320 I removed, cleaned, and painted all of my calipers last week. After re-installation the brake pad wear indicator light is on. Last night I attempted to trouble shoot the problem by unplugging all the sensors at the connection on the caliper. To my dismay the light did not go away with all of the sensors disconnected. I found the cause of the light to be the connector that bolts to the (front only) calipers. Without the connectors bolted into place the light is off. As soon as the connector is secured (ie. touching the caliper) the light comes on. Upon further examination it appears that when the connector touches the caliper the light comes on. Can someone tell me how this circuit is suppose to function? Is there suppose to be an insulation washer between the connector and the caliper? It only seems to be affecting the front calipers at the moment.

TIA

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Old 07-20-2005, 09:48 AM
Ali Al-Chalabi's Avatar
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Whenever any part of the sensor wire circuit is grounded to the vehicle, it completes the circuit and turns the light on. From what you describe, it seems like the connector is completing the circuit to ground and is your problem.
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Old 07-20-2005, 10:42 AM
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So is there suppose to be a insulating washer between the connector and the caliper. The part i'm talking about is pictured here:
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Old 07-20-2005, 05:03 PM
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Any ideas? I'm confused as I didn't think that the retaining connector touching the caliper was a problem.

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