<VV> Brake Fluid Tech tip

[Scott Trunkhill]

Here is the link to the entire post.

http://workshop.search-autoparts.com/_Tech-Tip-Testing-Brake-Fluid-With-Your-DMM/blog/209152/31710.html

Note the text from the end.

I played with the DMM method I described, and noticed that voltage readings were not affected by whether or not the engine was running, and what electrical accessories were on.  It was almost as if the fluid and contaminants in it were acting as a voltaic cell, creating voltage potential of it's own.  I won't state that as fact... merely conjecture.   But could this be a measure of copper/iron in the fluid?  Could this chemical catalytic process result in such a reading?

I'll leave that up to the scientists and engineers to figure out...




On May 24, 2010, at 1:43 PM, vair140 at aol.com wrote:

> I don't understand why there would me voltage showing.  Where is the positive voltage coming from thru the brake fluid.
>  
> Regards,
>  
> Guy Brandes
> 65 VAIR 140
>  
> ps it is so pleasant to see tech stuff and most of the negative stuff going away.
>  
> g
> 
> 
> 
> We all know that brake fluid is hygroscopic, able to draw in moisture like a 
> sponge.  It is no wonder, then, that the brake fluid in the master cylinder is 
> often dark, almost black in appearance.  But does that mean it has to be 
> changed?
>  
> Not always.  And while there are test strips to test the moisture content, here 
> is a method that works just as well.  Use your DMM (Digital Multimeter) to test 
> the fluid!  The procedure is easy enough.  Hook up your negative meter lead to 
> the negative battery post, and then insert your positive meter lead into the 
> brake fluid while avoiding contact with the reservoir itself.  Any reading over 
> 0.30 volts is too much, and the fluid should be flushed.  This test is a result 
> of an SAE paper showing a distinct relationship between moisture content and the 
> voltage measured.  It is also a great demo to share with your customer when 
> selling the repair!
> 
> > > 
> >> I attended a local car show yesterday. It was hosted by a local Auto Parts
> >> & machine shop. On the wall next to the parts counter, they had a printed
> >> tech tip. Most of us know that brake fluid is hygroscopic - it attracts
> >> water,  and it brings it into the fluid solution.
> >> 
> >> Seth  Emerson
> >> 
> >> C's the Day! - Corvair, Camaro,  Corvette
> 
> 
> 
> >> 
> 
> Scott Trunkhill
> CORSA, Corvair Atlanta, SECC, CORSA SC
> 66 Corsa, 65 Convertible, 65 Corsa Autocrosser, 63 Greenbrier
> scott at trunkhill.com
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Scott Trunkhill
CORSA, Corvair Atlanta, SECC, CORSA SC
66 Corsa, 65 Convertible, 65 Corsa Autocrosser, 63 Greenbrier
scott at trunkhill.com
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