can a brake sensor go bad??? My brake lining light when on, i checked brakes and my rear were getting low. i changed pads and new sensor. is there a way to test sensor? did i put sensor in wrong? i'd appreciate any help as the lining light is bugging me again. or is my front sensors bad, but the linings look good.

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1996 E320- 18" Chrome AMG, Bling Bling Mirrors

Brake sensors a cheap to buy and I would change the front too just to be safe anyway.

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89 190E
2.6L
Arctic white
Grey leather
Sunroof
Pirelli P400 rubber
Smoked corners

The sensors on my 1991 300CE are pretty simple, they produce a signal when shorted.

Even after you get your warning light , there is plenty of pad life left.

I had a signal from newly installed rotors, pads and sensors. I failed to tuck the excess wire under and it was quickly shorted by the turning wheel.

glenmore
1991 300CE
1990 LS400

As Glenmore notes, all these do is provide a grounding path for the light bulb. When the pad wears to the point that the rotor chafes off the insulation on the wire, the circuit is completed and the bulb lights up. Any point of ground contact will also light it up, so you'll need to check them all to locate the point(s) of contact, assuming the pads aren't yet worn that far..
I've been successful in reusing the front ones by dabbing the wire ends in RTV sealant, to 're-insuate', before inserting into the new pads.

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1986 560SL
2002 Toyota Camry
1993 Lexus

They are cheap, and some kits include them anyway, so I don't bother with r&r-ing the old sensors...and yes, from experience, improper install can set off the light easily...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car

the rear was bad and I did replace, when I still got that lining light I then disassebled the front pads and wala....... the front pads were wearing at the sensors too. Funny both wore out at same time. It looked good still visually. Thanks anyways for the help.

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1996 E320- 18" Chrome AMG, Bling Bling Mirrors

Can anyone tell me why my light lites up when I start the car, but now that I'm getting a grinding from my rotor, I still don't have a warning light?

Maybe they didn't put them in?

84 300SD and on Sunday all was good, now here it is the following Saturday and I have front and rear drivers side grinding when I press the pedal.

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1998 W202 C230 - The money pit of late.
1984 W126 300SD (356,800 miles) Gone to the wrenchapart
1984 W123 300D Gone to the wrenchapart
1972 W108 280SE 3.5 (sold but not forgotten)
1986 Buick Grand National 3.8l Turbo (86k miles)
1966 Glassic Model 'A' Replica http://www.glassicannex.org

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Maybe you've worn thru the sensor and the pads are almost totally gone?

Pull the wheels off and take a look.

glenmore

1991 300CE
1990 LS400