Author Topic: Brake fluid pen tester, how they work?  (Read 424 times)

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Offline rvalente

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Brake fluid pen tester, how they work?
« on: November 11, 2019, 09:43:43 pm »
I'm looking to buy one of these brake fluid pen testers, fairly common in auto shops.

I'm wondering, how they work? Its a know issue for brake fluid to absorb water (hygroscopic) but how is this measured? Increase in voltage? Decrease in resistance?

Is this a conductibility meter?

 

Offline GerryR

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Still learning; good judgment come from experience, which comes from bad judgment!!
 

Offline rvalente

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Re: Brake fluid pen tester, how they work?
« Reply #2 on: November 12, 2019, 10:07:36 am »
The simple stuff is just a conductivity meter
...

Tks!

Any chart describing conductibility x water content available?
 

Offline GerryR

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Re: Brake fluid pen tester, how they work?
« Reply #3 on: November 12, 2019, 02:23:26 pm »
I imagine that because each company has their own "design," they develop their own chart based on proprietary experiments / data.  You might try contacting the company at that link and see if they can tell you if a chart exists.
Still learning; good judgment come from experience, which comes from bad judgment!!
 

Offline rvalente

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Re: Brake fluid pen tester, how they work?
« Reply #4 on: November 12, 2019, 07:52:05 pm »
Ahh, wont bother, they wont reply my with any relevant information.

Just occurred me to check google patents
 


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