<VV> Brake Fluid Tech tip

[Scott Trunkhill]

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!

> 
> ----- Original Message ----- 
> From: <Sethracer at aol.com>
> To: <virtualvairs at corvair.org>
> Sent: Sunday, May 23, 2010 7:21 PM
> Subject: <VV> Brake Fluid Tech tip
> 
> 
>> 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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