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#1
03-08-2009, 09:35 PM
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Brake pad sensor(s).
Plain and simple. Did ALL 123s come with them? Mine has a spot on the cluster for it, but there is no bulb behind the legend. Was it my PO's way of 'fixing' a problem, or did some not come equipped with them.
Thanks! 78 240D4spd 129K 
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#2
03-08-2009, 09:48 PM
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My 78 240d 4spd has them. Have you checked behind the wheels? If it came equipped with them, there should be a plastic bracket on the back of the caliper that the sensors plug into. It would be kind of weird to remove that bulb though, since if you don't have the sensors plugged in, nothing happens. Maybe the PO took the bulb out to change it and never got around to it?
__________________
1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car)
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#3
03-09-2009, 03:07 AM
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For what it's worth, my automatic '78 240D (August birth-month, I believe) has one.
The FSM mentions the sensors in the section on removing the front calipers, without qualifying model year variations. The presence of a clear icon to be illuminated suggests there should be a light to illuminate it.
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'Betsy the Getaway Car' : 1978 MB 240D, 582k 'The Mistress of the Sea' : 2001 Giant Boulder, 10.30k
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#4
03-09-2009, 03:20 AM
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My '79 has them too. If it did not come with a car there would not be a picture for the warning light, it would be blank.
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#6
03-09-2009, 12:05 PM
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Answer
The rotor cuts into the sacrificial sensor grounding the circuit = lighting the bulb.
This is why they are replaced with each brake pad service.  Have a great day.
__________________
ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#8
03-09-2009, 12:27 PM
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It is easy to check. Insert the correct light bulb in the dash. The ground the brake sensor but touching to chassis. The brake warning light should come on.
__________________
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.
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#9
03-09-2009, 12:29 PM
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I meant "Then ground the brake sensor by touching to chassis". Too early in the morning in CA.
__________________
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.
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