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| Re: [GMCnet] Brake Fluid Moisture Tester [message #297592 is a reply to message #297575] |
Fri, 18 March 2016 09:01   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Les Burt[1 wrote on Thu, 17 March 2016 23:32]Looks similar to a TDS tester.
I seem to recall reading somewhere how to use a VOM to test for moisture in brake fluid. That obviously would require knowing what good fluid has as a resistance vs fluid with excessive moisture.
<snip>
Les Burt
Montreal
Picked off the web....
"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!"
This is what I found. That does not mean that I think that the test is valid. There are way too many variables that are not accounted for. For starters, I don't know where the 0.3V comes from. If there is anything like that stray in the braking system, then electrolytic corrosion is going to run away.
I am going to try to research this more. In the mean time, I may try to acquire one of these.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Brake Fluid Moisture Tester [message #297593 is a reply to message #297592] |
Fri, 18 March 2016 09:10 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Like this?
http://gmc49ers.blogspot.com/2013/12/things-to-do-with-your-free-gmc-meter.html
On Friday, March 18, 2016, Matt Colie wrote:
> Les Burt[1
>> wrote on Thu, 17 March 2016 23:32]Looks similar to a TDS tester.
>>
>> I seem to recall reading somewhere how to use a VOM to test for moisture
> in brake fluid. That obviously would require knowing what good fluid has
>> as a resistance vs fluid with excessive moisture.
>>
>>
>> Les Burt
>> Montreal
>
>
> Picked off the web....
>
> "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!"
>
> This is what I found. That does not mean that I think that the test is
> valid. There are way too many variables that are not accounted for. For
> starters, I don't know where the 0.3V comes from. If there is anything
> like that stray in the braking system, then electrolytic corrosion is going
> to
> run away.
>
> I am going to try to research this more. In the mean time, I may try to
> acquire one of these.
>
> Matt
>
> --
> Matt & Mary Colie - Members GMCMI, GMCGL, GMCES
> '73 Glacier 23 - Still Loving OE Rear Drum Brake with Applied Control Arms
> Now with both true Keyless and remote entry
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Brake Fluid Moisture Tester [message #297594 is a reply to message #297571] |
Fri, 18 March 2016 09:28 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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Ken.
I have a similar moisture meter for brake fluid. I put it into a brake system with new fluid and it says things are O K. Older brake fluid 3 to 4 years old it will show differing levels of moisture depending on vehicle. On cars that are 1 or 2 years old it shows kind of OK.
The question about it working is dificult to say but it seems to follow what I would expect. (I dont have the resouces to calibrate it) One thing is for sure. If it says fluid is bad, I flush the system. It defiantly is a convincing indicator to do the job. (For customer work it stopped arguments because it became a non emotional indicator)
I think it is worth the 10 bux.
But what do I know?
Regards.
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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