Brake wear message-how to turn off - Mercedes-Benz Forum
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#1 (permalink) Old 03-21-2012, 10:16 PM
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Brake wear message-how to turn off

Replaced front pads and rotors but brake wear message still on 350 CLK. How do I reset this message?
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#2 (permalink) Old 03-21-2012, 10:58 PM
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I'd imagine removing the negative battery cable for a minute and re-installing would do the trick.
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#3 (permalink) Old 03-22-2012, 09:45 AM
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You should have a brake pad sensor on at least one of the front brakes. It is inserted in the brake pad itself. This needs to be replaced anytime the warning message comes on. Once the sensor comes in contact with your brake rotor it turns the warning message on and is no longer usable. They are cheap at Autohaus
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#4 (permalink) Old 03-22-2012, 03:01 PM
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Brake wear warning

In reading the related topics, I see that the sensors need to be replaced. I just pulled my old one out and the message stayed on. I'll get a new one. Thanks
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#5 (permalink) Old 03-22-2012, 07:45 PM
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The sensor is basically a ground loop. When circuit is completed to ground, the warning is activated. It's possible your sensor wire insulation is worn off and grounding against the caliper or other suspension parts. In this case, you just need to replace the sensor (it comes with a new wire). Mine was doing this when it was raining and it ended being a loose connection where the sensor plugs into the wiring harness.

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#6 (permalink) Old 03-22-2012, 08:14 PM
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Rodney,
I currently have no sensor and the warning is on so maybe a reset is necessary.
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#7 (permalink) Old 03-23-2012, 05:55 AM
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Caldecott

Be aware that you do not have a brake wear sensor on EVERY brake. Generally one at the front and one at the rear. See the sensor layout in the WIS drawing below for several models. Not sure where your CLK 350 fits in...
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File Type: pdf brake wear sensors.pdf (808.3 KB, 600 views)
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#8 (permalink) Old 03-23-2012, 09:15 AM
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Not sure I understand.

In BMW products (at least I know, MINI Cooper, specifically) the brake sensors...also one per axle, alternate side...consist of a wire loop to complete a circuit. Ie: the circuit is "normally CLOSED". When the circuit is broken, or the sensor is unplugged (removed...whatever), the warning is triggered. The business-end of the sensor consists of a small exposed wire loop inserted within the pad, that when exposed to the rotor surface via pad-wear, breaks, opening the circuit and must then be replaced (or "cheated" at the connector).

What I think I'm understanding is that the Benz wear sensors work on the opposite principal...triggering the warning only when an exposed wire touches the rotor, thereby completing the circuit to ground ("normally OPEN"). If this is the case, my question becomes what is to prevent someone from simply unplugging the sensor at the connector and calling it done (never to be grounded/triggered again). Also--where the BMW system forces you to replace the sensors once broken, by design--can the Benz sensors be reused?

Last edited by ellcapitan; 03-23-2012 at 09:22 AM.
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#9 (permalink) Old 03-23-2012, 09:24 PM
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Yep, it's normally open, so if the sensor fails, you can unplug it and you'll never get an error. Of course you can then wear your pads down to the metal with no worries about those annoying messages!

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#10 (permalink) Old 03-23-2012, 09:41 PM
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The old pads did not wear to the sensor. I tried to reuse it but broke it and it triggered the warning. I pulled it and the warning stayed on. Btw, I have never replaced the pads and not have to replace the rotors..
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