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  #1  
Old 12-28-2018, 10:15 PM
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bobby bobby is offline
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Longevity of DOT Fluid

We all know that glycol based DOT brake fluid begins to absorb moisture as soon as the container is opened. And that half used containers should not be stored very long. But how much moisture can it really absorb from an air tight container? I live in a very dry climate so it doesn't seem like the small amount air, let's say its a quarter cup, can hold enough moisture to significantly degrade the remaining brake fluid.
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Old 12-28-2018, 10:29 PM
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Re: Longevity of DOT Fluid

I never tossed open containers of brake fluid.Ever....!

Then I bought this a few years ago.Just to make sure.

https://www.amazon.ca/Brake-Tester-I...97275328&psc=1
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Old 12-28-2018, 10:42 PM
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Re: Longevity of DOT Fluid

Great tool. I didn't know there was such a thing. So what's the verdict? How fast and how much moisture will an previously opened container of fluid absorb?
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  #4  
Old 12-29-2018, 01:25 AM
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Re: Longevity of DOT Fluid

It's a good question. The standard line you hear repeated all the time is 'don't store brake fluid' but logically... are we supposed to believe that you need to toss any remaining fluid in a tightly capped brake fluid container immediately after opening because it is somehow contaminated, but the tiny volume of fluid in a motorcycle braking system is somehow good for service for two years? Doesn't make sense.

I purchased one of those testers a few months back but haven't had the chance to use it yet because I don't have any leftover brake fluid hanging around. But when I do I'm going to do test and see if there actually is any problem with properly-stored brake fluid (previously opened but tightly capped) for a reasonable period of time. My guess is no.
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Old 12-29-2018, 12:26 PM
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Re: Longevity of DOT Fluid

Quote:
Originally Posted by bobby
Great tool. I didn't know there was such a thing. So what's the verdict? How fast and how much moisture will an previously opened container of fluid absorb?

None if precautions were taken?Punch a little hole in the seal to pour the fluid.And put cap back on in between pours?

Low relative humidity helps when bleeding...sunny dry day vs foggy/rainy?

Some of them fluids show <1% right out of a fresh container.Not so the Pentosin LV in the metal can it shows 0%.Only comes in quarts(?) so enough for 2-3 system flushes on my i-ABS.

I think I have an open vintage can of DOT3 amongst my shop collectibles? Got to be 30yrs old from the graphics.I'll test it when I see it.

Tester? Twice stuck it into the fluid on 2 different BMWs iABS and both times lit up like a Christmas tree.Never lit up at more than <2% on my bike and that was the clutch side.Brakes are usually at <1% over a year and were at 0% on the last check a month ago.
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Old 12-29-2018, 03:52 PM
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Thumbs up Re: Longevity of DOT Fluid

Great thread!

Thanks.
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Old 12-29-2018, 10:35 PM
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Re: Longevity of DOT Fluid

Good information Pierre. I just bought a quart can of Pentosin Super DOT 4 to change the fluid out this winter.
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  #8  
Old 12-30-2018, 12:36 PM
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Re: Longevity of DOT Fluid

Quote:
Originally Posted by bobby
Good information Pierre. I just bought a quart can of Pentosin Super DOT 4 to change the fluid out this winter.

Super? Check the Pentosin website,they do have crossreferences to OEM part numbers.

Two types of DOT4 from Pentosin,the Super and the LV?The DOT4LV is the one that correspond to BMW OEM unless that changed in the last couple years?I should read it again....!

In any case great technical info from Pentosin on Coolants and Brake fluids.
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  #9  
Old 12-31-2018, 01:12 PM
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Re: Longevity of DOT Fluid

Longevity?

This got to be 30yrs old?I remember that brand from my youth.


2018-12-31_08-35-35 by Pierre Begin - Flickr2BBcode

Failed?

2018-12-31_08-35-52 by Pierre Begin - Flickr2BBcode




Much better that one.Been opened in the plastic container for 3(?) years?I seem to recall that it did test <1% from new.

Recochem OEM DOT4 for German vehicles:


2018-12-31_08-36-35 by Pierre Begin - Flickr2BBcode

Pentosin DOT4 LV in the metal can? Been opened for a good while.Good stuff...tested at 0% then and still does now.


2018-12-31_08-36-54 by Pierre Begin - Flickr2BBcode
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Old 12-31-2018, 03:24 PM
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Re: Longevity of DOT Fluid

Nice Pierre and thanks for enlightening me about the LV. I did some searching and it seems like BMW is recommending the LV for their motorcycles, even though it does not specifically say 'Low Viscosity' on the BMW DOT 4 brake fluid containers or in any BMW fluid specifications I looked at.
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  #11  
Old 12-31-2018, 03:26 PM
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Re: Longevity of DOT Fluid

PS. So are you going to use the Atlas fluid? Might as well...couldn't hurt, right?
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  #12  
Old 12-31-2018, 05:30 PM
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Re: Longevity of DOT Fluid

Quote:
Originally Posted by bobby
Nice Pierre and thanks for enlightening me about the LV. I did some searching and it seems like BMW is recommending the LV for their motorcycles, even though it does not specifically say 'Low Viscosity' on the BMW DOT 4 brake fluid containers or in any BMW fluid specifications I looked at.
BMW sells LV.I think it is in MAX's parts fiche.Pre 2000 or thereabouts BMW DOT4 wasn't LV so OEM was updated then.

Atlas fluid?Petroliana collectables are worth some $$$$.And more if container if full.As is probably close to what they want for Pentosin LV up here.
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  #13  
Old 01-04-2019, 04:36 PM
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Re: Longevity of DOT Fluid

Very interesting post guys! As said, I had no idea such a tester existed. Pretty cool indeed!


Jim
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