<VV> brake help

jvhroberts at aol.com jvhroberts at aol.com
Sun Jan 27 10:02:30 EST 2019

 Silicone fluids have about double the volume compressibility of glycol based fluids. So do hydrocarbon fluids. No doubt one of the reasons glycol based brake fluids prevail. 

John Roberts
-----Original Message-----
From: Hugo Miller via VirtualVairs <virtualvairs at corvair.org>
To: virtualvairs <virtualvairs at corvair.org>
Sent: Sun, Jan 27, 2019 7:46 am
Subject: Re: <VV> brake help

It wasn't tongue-in-cheek; most people think you can compress rubber 
into a smaller space. I certainly did, and I found it very 
counter-intuitive when I learned that you can deform rubber but not 
compress it. Try fitting an over-size 'O' ring and you'll see what I 
I am of course talking about practical applications, not theoretical 
physics. In any case, while theoretical physics used to make perfect 
sense in the clockwork universe of Isaac Newton's day, it makes no sense 
whatsoever in Heisenberg's uncertain present, especially when you get 
into the area of quantum physics. I sometimes think they're making it 
all up just to gull us.

On 2019-01-27 02:02, Jay Maechtlen via VirtualVairs wrote:
> On 1/23/2019 7:46 PM, Hugo Miller via VirtualVairs wrote:
>> I decided to see if I could find the basis for some of the claims 
>> against silicone brake fluid. This site had an interesting article, 
>> including some pics of what happens when you mix silicone & 
>> non-silicone fluid; The (purple) silicone fluid sits on top of the 
>> DoT4. But shake it up & let it settle & the colors are reversed! This 
>> is allegedly due to the DoT4 absorbing the purple dye from the 
>> silicone fluid.
>> http://www.buckeyetriumphs.org/technical/Brakes/Fluid/Fluid.htm
>> This site also mentions compressibility in some detail. It blithely 
>> states that silicone fluid is more compressible than DoT4, ignoring 
>> the well-known fact that liquids are not supposed to be compressible! 
>> (nor is rubber, of course).
> Well, obviously rubber and various elastomers are compressible.
> (perhaps the comment above was tongue-in-cheek)
> But so are liquids - just 'not very', compared to gases.
> http://hyperphysics.phy-astr.gsu.edu/hbase/Tables/compress.html
> here's a page with compressability of some liquids.
>> _________________

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