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AutoMD ... 2/15/2014
2004 Chevrolet Impala LS 6Cyl3.8L - Brakes
Why does my "Low Brake Fluid" light keep coming on?
After driving approximately 12-15 miles, the "Low Brake Fluid" light comes on (also the "abs" light) and I naturally check the level, and add more brake fluid (DOT4). Same thing happens again after driving about the same distance. My Impala has less than 80,000 miles on it.
2 Answers
  • HouseCallAuto
    HouseCallAuto 2/15/2014
    I would guess that the fluid height sensor within the master cylinder reservoir is sticking and giving a false reading. The abs light turning on at the same time might be a result of the low brake fluid indicator, in other words it may disable the abs (turns on the abs light) if the abs module is being told its low on fluid, even if it is a false reading. Try excercising the float with a suitable tool / pencil or whatever works.
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    HouseCallAuto
    AutoMD Member 2/16/2014
    Thanks, but my question would be why do I have to keep adding fluid, and why does the brake pedal go to the floor each time the light comes on if it's just a false reading. Where does the extra fluid go, and where is the float I'm supposed to exercise?
  • HouseCallAuto
    HouseCallAuto 2/16/2014
    I misunderstood. I missed where you said that the fluid was actually disappearing and needed to be replenished. OK, you have a leak plain and simple. Brake fluid does not evaporate. If I were to look it over I am certain I would find a leak, either from a rusted porous steel line or a caliper piston seal or whatever. There is a leak. It can be diagnosed by someone that knows where to look.
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    HouseCallAuto
    AutoMD Member 2/16/2014
    Thanks a lot for the help, and sorry about the misunderstanding. At least now I have some idea what the problem is.
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