Just changed out both front brake sensor wires

The actual sensor harness not the short wires that come with new pads...

The yellow light flickers once in a while.

But randomly and intermittently.

By pads have approx 30k miles.

Do these sensors give false positive sometimes?

What could trigger the flickering?

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1983 300CD Turbodiesel

Yeah, it happens to me in the rain. I suspect some disk filings and water get in the wrong place. Then the light turns on and off. I have plenty of meat on the pads. I just ignore it.

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79 300TD “Old Smokey” AKA “The Mistake” (SOLD)
82 240D stick shift 335k miles (SOLD)
82 300SD 300k miles
85 300D Turbodiesel 170k miles

It is easy to diagnose. Unplug the sender wires from the calipers. It should not flicker at all as there is no ground anymore. If it still flickers then you have problem in the wiring. If it stops then problem in sensor. Plug sensor in one at a time to find which one.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

My "worn pad" lamps show a faint glow when driving in the rain. Using LED bulbs requires less leakage current. The pad sensor wire simply shorts to ground (rotor) to light the lamp.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

This may be silly, but double check that the plastic tips are still on the end of the sensor.


Don't ask how I learned that the plastic tips were supposed to stay on the end of the sensor.

MongooseGA is right -- the plastic tips on the ends of the sensor wires that poke down into the brake pad are required. If you pull the sensor wires out of the pad, you lose the tips and then the wire will ground out through the pad material in the rain. Replace them with new wires if you want the false positive indication to go away.

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'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png

Broadband: more lies faster.