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Old October 20th, 2016   #1
echo
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Default Read What Valvoline Says About Storing Brake Fluid

As far as they are concerned you dont throw out unused brake fluid.

They make it, they ought to know.

Or maybe they are Trolls?
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Old October 20th, 2016   #2
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Default Re: Read What Valvoline Says About Storing Brake Fluid

Thanks for the info but I'll stick with unopened products, only.
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Old October 20th, 2016   #3
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Default Re: Read What Valvoline Says About Storing Brake Fluid

Since they make brake fluid in quart containers and larger (which dealers and shops buy) I have to believe those people don't throw out brake fluid either.
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Old October 20th, 2016   #4
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Default Re: Read What Valvoline Says About Storing Brake Fluid

When you put the cap back on a container of brake fluid it IS sealed and airtight.

Heres how brake fluid is sold to businesses who service our vehicles.

Think theyre gonna throw the remainder away after they change your brake fluid? Would they do anything to endanger their customers and incur liability?

http://petroleumservicecompany.com/a...ontent=Coastal

As for air let into an opened brake fluid container and resealed.....point 5% of 25cc of air (the amount of water VAPOR in air) is a very small number. So small its probably meaningless. Id like to see a measurement!
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Last edited by echo; October 20th, 2016 at 09:49 AM.
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Old October 20th, 2016   #5
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Default Re: Read What Valvoline Says About Storing Brake Fluid

Echo, you have my blessing. You can put whatever you wish into YOUR bike.

Well... If you still had a bike you could.

As for me, I save that old brake fluid for when I have to help someone I don't like.
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Old October 20th, 2016   #6
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Default Re: Read What Valvoline Says About Storing Brake Fluid

Garages will use the left overs in a short space of time.
I'd just not bother Paul. ::
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Old October 20th, 2016   #7
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Default Re: Read What Valvoline Says About Storing Brake Fluid

Many years ago, gas stations and auto shops had brake fluid in 1 gallon pump cans.
ABS and better research, cured that.
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Old October 21st, 2016   #8
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Default Re: Read What Valvoline Says About Storing Brake Fluid

Lets do some math....

Lets say after using our new bottle of brake fluid we took 25cc out of it and now that volume has been displaced by air. With nasty water vapor in it!

Water vapor at standard atmospheric pressure and temperature has .8 grams of water per 1000cc according to Wikipedia. 25/1000 = .025 gram of water now inside our bottle of brake fluid. Since there are~ 28 grams in an ounce that means theres .025/28 =.0009 ounces of water in there to be absorbed by the brake fluid.

This is a problem?

In spite of the fact that the tin foil is gone the bottle is still air tight. So no more water vapor can get in.
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Old October 21st, 2016   #9
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Default Re: Read What Valvoline Says About Storing Brake Fluid

Quote:
Originally Posted by echo View Post
Lets do some math....

Lets say after using our new bottle of brake fluid we took 25cc out of it and now that volume has been displaced by air. With nasty water vapor in it!

Water vapor at standard atmospheric pressure and temperature has .8 grams of water per 1000cc according to Wikipedia. 25/1000 = .025 gram of water now inside our bottle of brake fluid. Since there are~ 28 grams in an ounce that means theres .025/28 =.0009 ounces of water in there to be absorbed by the brake fluid.

This is a problem?

In spite of the fact that the tin foil is gone the bottle is still air tight. So no more water vapor can get in.
It could be. If the temperature of the brake fluid gets hot enough to vaporize the air you now have gas bubble in your brake line. 0.8 grams of water will vaporize to 1,360cc at 100 degrees C. that means that 0.0009 ounces of water absorbed into brake fluid will expand to approximately 42cc at 100C.

What is the volume of a motorcycle's brake system? 50 - 100cc? 42 seems like pretty significant vapor volume to me.
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Old October 22nd, 2016   #10
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Default Re: Read What Valvoline Says About Storing Brake Fluid

But its not .8 grams. Thats per liter of air. Since theres only 25cc of air in the opened bottle of brake fluid you have to divide 25cc by 1000cc and multiply by .8 gram. Which means theres only .02 grams of water in there, not .8.

And the entire contents of the braking system arent going to be heated to 100 C, just the much smaller amount in the calipers.

Now if youre RACING motorcycles the brake fluid is going to get a lot hotter than 100c. You MIGHT have a problem there but Id have too see the math with actual figures before conceding that.

And you have to start with....what temperature is the brake fluid at the caliper at and how much is a thousandth of an ounce of water going to expand at those temps.

But wait! A thousandth of an ounce is water is whats in the ENTIRE system. Which isnt going to be at caliper temperature. The actual volume of water vapor at caliper temperature is much less than that.

This is probably why the idiot engineers at BMW have gone to mineral oil based (or whatever it is) brake fluid maybe 15 years ago. That cant absorb water. This is a solution in search of a problem which doesnt exist. (except at extreme limits of operation) As far as I know no other manufacturer has gone to that.
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Last edited by echo; October 22nd, 2016 at 04:26 AM.
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