[Healeys] Silicone vs Glycol (natural or otherwise) brake fluid

Bob Spidell bspidell at comcast.net
Wed Jun 9 12:44:31 MDT 2010

Since at least 2 Listers (myself and another) have had problems with 
DoT4 crystallizing in brake systems in cars that sat for extended 
periods (a couple years), I'm wondering why this is, and why cars that 
don't sit don't seem to have the problem.  My guess: the heat and 
agitation from using brakes keeps whatever tends to crystallize in 

FWIW, one of the few/only ways to determine antifreeze 
poisoning--antifreeze being another form of glycol--is to examine liver 
and kidney tissues for crystalline precipitation.  I believe the 
substance is an oxalate.


"The United States armed forces have standardised on silicone brake 
fluid since the 1990s."--http://en.wikipedia.org/wiki/Brake_fluid

What a bunch of snobs.

Bob Spidell           San Jose, CA            bspidell at comcast.net


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