light in the dash comes on the first time I touch the brake and does not go out. The car is an 87 300D. Fluid level is not low...........any ideas as to what is causing this ... I have checked and replaced all fuses
thanks
joel

I have already unplugged at the resevoir thinking that would kill the light but it stayed on---where could the problem be between the plug and the light?
and why does the light come on when I touch the brake?
joel

Float is just absorbing fluid now so is too heavy, not staying up, needs sensor. Unplugging sensor and light staying on is normal. You jump the 2 wires together for the light to stay out. Low fluid light coming on when braking is just due to the movement of the float, it's just borderline right now.
Gilly

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Gilly
Would the sensor also be called a check valve--I'm trying to look the sensor up on fastlane parts
Joel

Joel,
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1VP11CKBY1YC0TTTA5&year=1987&make=MB&model=300-DT-002&category=P&part=Reservoir+Level+Sensor

As you might be able to make out, the Category is "Body Electrical" and the part name is Reservoir Level Sensor.

Good luck,

-Larry

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09 Jetta TDI
1985 300D

Another possibility would be the "bulb out" indicator bulb being inadvertantly put into the "low washer fluid" bulb position when the dash was out.

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Steve
'93 400E

I really appreciate the helpful suggestions. I have disconnected the sensor(top of the resevoir and the light still comes on. I have placed a wire from one side of the plug to the other as suggested and the light still comes on. I have checked all the lights to see if I have one out and I don't . I have also replaced all fuses with new.
There is another electrical issue with this car. The rear defrost light is constantly on. I replaced the switch and no help.
I will replace the resevoir level sensor tomorrow-------any other suggestions? any ideas about the rear defrost light?
Car has 195k mi
thanks
joel