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Brake Fluid Testing
#1355708 Fri Apr 17 2020 03:08 PM
Joined: Dec 2018
Posts: 517
A
Apache1 Offline OP
Shop Shark
Is there a kit out there available to test MC brake fluid for acidity....etc.?





Re: Brake Fluid Testing
Apache1 #1355715 Fri Apr 17 2020 03:42 PM
Joined: Dec 2001
Posts: 15,201
Boltergeist
Curious minds what to know.....May I ask why?


1937 Chevy Pickup
1952 Chevy Panel
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52 Chevy Panel

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Re: Brake Fluid Testing
Apache1 #1355719 Fri Apr 17 2020 03:56 PM
Joined: Apr 2005
Posts: 9,003
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Saw one somewhere, don’t remember where though.


Martin
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‘39 Dodge Businessmans Coupe
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Re: Brake Fluid Testing
Apache1 #1355738 Fri Apr 17 2020 05:27 PM
Joined: Jan 2016
Posts: 567
S
Shop Shark
Moisture tester:

Amazon:
PTE Tester Calibrated for for DOT 4 Brake fluids
by PTE
4.2 out of 5 stars 467 ratings | 22 answered questions
List Price: $8.49
Price: $6.99 & FREE Returns
You Save: $1.50 (18%)
Get $100 off instantly: Pay $0.00 $6.99 upon approval for the Amazon Prime Store Card. No annual fee.
Color: Calibrated
Quick and easy way to test for moisture content in the brake fluid; results appear in seconds
LED light indicators show percentage of water in the brake fluid
Calibrated for cars using DOT 4 brake fluid only (found in most cars produced since 2006)


Acidity and moisture test strips

https://www.acustrip.com/res/pdf/61000_SS.pdf

https://www.acustrip.com/cgi-bin/proddesc.cgi?s=61000

Takes 1 x AAA/1.5V battery (included)
Only takes seconds to know t

Last edited by showkey; Fri Apr 17 2020 05:33 PM.
Re: Brake Fluid Testing
Apache1 #1355740 Fri Apr 17 2020 05:35 PM
Joined: Jan 2017
Posts: 133
D
Shop Shark
I go by the old adage " If in doubt change it out"


38 Chevy 1/2 ton being resto-moded
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Re: Brake Fluid Testing
Apache1 #1355742 Fri Apr 17 2020 06:00 PM
Joined: Mar 2002
Posts: 9,030
Master Gabster
Some garages use the moisture checker on a regular basis. Dealerships like to change the fluid every few years.


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1951 1 Ton Completed


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Re: Brake Fluid Testing
Apache1 #1355749 Fri Apr 17 2020 07:30 PM
Joined: Feb 2004
Posts: 21,005
H
Boltergeist
DOT 3 and 4 brake fluid is made with alcohol and glycerine as the basic components. It's "hygroscopic", meaning it will absorb moisture from the humidity in the air. I'd recommend flushing the brake system every couple of years with fresh fluid, rather than try to test it. A couple of cans of new brake fluid and a little time spent bleeding the system is cheap life insurance. DOT 5 fluid is silicone-based and doesn't absorb moisture, but that stuff opens up a Pandora's box of problems when it's used in a system not engineered for it!
Jerry


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Re: Brake Fluid Testing
Apache1 #1355754 Fri Apr 17 2020 07:58 PM
Joined: Dec 2018
Posts: 517
A
Apache1 Offline OP
Shop Shark
12 year old newer vehicle w/only 1500 miles on the odometer. Garage kept although I suppose it could draw moisture from sitting.





Re: Brake Fluid Testing
Apache1 #1355760 Fri Apr 17 2020 08:09 PM
Joined: Jan 2016
Posts: 567
S
Shop Shark
DOT 5 should NOT be confused with 5.1 brake fluid

Since DOT 4 and 5.1 are both glycol-based brake fluids they are compatible with each other, which means they can be readily mixed without harming your brake system. It is important never to mistake DOT 5.1 (glycol-based) with DOT 5 which is silicone-based and should never be mixed with any other DOT fluid.

https://epicbleedsolutions.com/blogs/faq/whats-the-difference-between-dot-4-and-dot-5-1-brake-fluid

Last edited by showkey; Fri Apr 17 2020 08:11 PM.
Re: Brake Fluid Testing
Apache1 #1355773 Fri Apr 17 2020 08:56 PM
Joined: Feb 2011
Posts: 902
R
Shop Shark
Should I count myself lucky? I've used Dot 5 silicone brake fluid in my 1939 Chevy truck for more years than I can remember. Original Huck brake system. No problems what so ever. I can slam on the brakes and put your nose into the windshield. So what are the problems?

Rick

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