<VV> Brake Fluid Tech tip

[Richard Gebhardt]

Chris & Bill Strickland wrote:
> Wonder if this works to test gas tanks for fuel condition and corrosion 
> --- ???  Or coolant systems in water pumpers They all sound like 
> batteries of various sorts.
>
> Remove the brake fluid reservoir cap, and set the DVOM to read voltage 
> on the lowest voltage range of the meter. Place one of the DVOM probes 
> into the brake fluid, and the other against the body of the master 
> cylinder. The voltage should be no greater than 0.3 volts. If the 
> voltage is higher, this indicates a galvanic reaction, and means that 
> there is an unacceptable level of moisture in the brake fluid.
>
> The majority of today's braking systems use a combination of dissimilar 
> metals. Manufacturers use aluminum in pistons and housings, steel in 
> some wheel cylinders and brake lines. [and copper inside lines]
>
> When moisture mixes with brake fluid a galvanic action can occur. 
> Galvanic action is similar to the operation of a battery. The more 
> moisture in brake fluid, the higher the galvanic reading and the greater 
> the corrosion it causes.
>
> from http://www.cdxetextbook.com/brakes/brake/brakes/repbrakefluid.html
>
> Bill Strickland
>
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>   
Thanks for explaining why a  small voltage  may register .


Richard  Gebhardt

CORSA
NTCA
MCC
69Group
Corvanactics