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Old 11-13-2003, 04:09 PM
3 MB's and counting!
Join Date: Apr 2001
Location: Toronto, Canada
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Question w126 Brake Pad wear indicator light going nuts!

Yesterday while driving in rain...I noticed the brake pad wear light is now pulsating as the speed of the wheel going around.....being...the faster I go the fater it will pulsate so it must be a point on the pad thats triggering the light to go on.

The thing is my brake pads are fine so why would it do this all of a sudden?

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Old 11-13-2003, 04:25 PM
Q Q is offline
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Have you checked the sensor wires to make sure they are not rubbing the rotor?
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Old 11-13-2003, 05:45 PM
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no havent checked it just happened last nite.
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Old 11-14-2003, 02:25 AM
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Brake Pad Light

It is a simple system. The sensor touches the rotor and bingo, the light comes on. I must admit, I have never seen one pulse as fast as yours does.
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Old 11-14-2003, 07:57 AM
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Oh yeah, they do that when the pads are getting down close to the sensors. It will go on like that in the rain for awhile. Then you will start to get a solid indication when you step on the brake hard. Then you will get some flashing going along, and an indication every time you step on the brakes.

Then it will stop. At that point the wear indicators are gone.

You get lots of warning of pad wear. Really a great system - it allows you to plan a long time in advance for pad replacement.

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Old 11-14-2003, 11:19 AM
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The indicator on my W124 flashes when the sensors begin to make contact with the rotor. Wet brakes complete the circuit more effectively than dry (hence light coming on during rainy days).

Also, slight rotor warpage is the reason why it "flashes" instead of staying completely lit.

When I do pull the pads, there is still over a third of the pad left, even after driving 2K or so miles after the light first comes on...

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