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  #1  
Old 11-30-2011, 11:31 PM
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Brake sensor 83 240D

I'm getting ready to replace the front pads on my 83 240D and was wondering about the sensors. How do they work? I worked on one car and the sensors had a wire that was cut when the sensor touched the rotor, requiring replacement. (Toyota i think) My light is coming on when I apply the
Brakes. will I have to replace the sensors also?
Jon J

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Old 11-30-2011, 11:40 PM
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Not necessarily.
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Old 12-01-2011, 12:30 AM
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They are cheap enough. I would do it anyway.
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Old 12-01-2011, 01:17 AM
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USUALLY. the wires are near impossible to remove without breaking them. it can be done, but they are not expensive. also, they get worn when they contact the rotor, so they are likely needing replacement anyway.
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Old 12-01-2011, 10:21 PM
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$1.25 for the sensor. 1983 Mercedes Benz 240d BrakeProduct Subcategories - Peachparts

I'd use the link (or order the sensors) to get an idea of how the connect and where to pull them from.

Read up on cleaning the caliper and lubing the sides of the pads.
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Old 12-01-2011, 10:25 PM
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Quote:
Originally Posted by vstech View Post
USUALLY. the wires are near impossible to remove without breaking them.
That must be the $1.25 versions!!! I still have the original sensors in my '82 300D. They have been in and out a number of times in the past 29 years.
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  #7  
Old 12-05-2011, 07:34 PM
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what I found is,,,,

The sensors work by a wire contacting the rotor after a certain amount of wear, tripping the idiot light. By this time the sensor is damaged. Therefore,

If the light has come on when you replace the pads, you will need to replace the sensor.

If the light has not come on when you replace the pads, you will not have to replace the sensor.

Jon J
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Old 12-05-2011, 07:52 PM
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I have reused my sensors for years and they work fine. Just be careful pulling them out of the brake pad hole. 81 300SD.
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Old 12-05-2011, 08:50 PM
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sensors

Mine were worn through the wires. I was quoted a price of $65 each by the idiot at the authorized stealer. Because of the "price " I thought it was a much more expensive proximity switch . that was the reason for the how does it work question. (unanswered) I have a very limited amount of time to work on my car and its 85 miles to a good parts house. So the more I know the better. Oh well they are cheep and easy to replace. (now I know)
Jon J
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Old 12-05-2011, 10:22 PM
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that was the reason for the how does it work question. (unanswered)
It's real simple. When the pads wear through to the "sensor," the end of the wire makes contact with the rotor, completing the ground circuit for the warning light.

Quote:
Originally Posted by Jon J View Post

If the light has come on when you replace the pads, you will need to replace the sensor.
Like a lot of things, it's a matter of degree. It depends on how long you keep driving after seeing the light for the first time.
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Old 12-06-2011, 08:06 AM
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It was clearly stated in one of the above posts. If you are replacing the pads before the sensor turned on the light it is highly likely that they are easily reusable. If the light has come on, then it has worn through the insulation on the sensor and it would be best to replace it. I've had good luck reusing ones that had not worn through.

Use a thin coat of dielectric grease on the post when securing the connector.

Hope this helps.
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  #12  
Old 12-06-2011, 06:47 PM
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if you are refering to post #7

[QUOTE=LarryBible;2841914]It was clearly stated in one of the above posts. If you are replacing the pads before the sensor turned on the light it is highly likely that they are easily reusable. If the light has come on, then it has worn through the insulation on the sensor and it would be best to replace it.


That was my post I made AFTER i did the brakes. Yep that's me alright I recognize the name. You're right it is clear,,,,, now.
Jon J
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Last edited by Jon J; 12-06-2011 at 06:51 PM. Reason: title
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