On 2/10/06, gary freeman <riven2649@yahoo.com> wrote:
> I don't want you to think that I disagree with you because I don't like you
> as I don't even know you; but when I see something that I know is incorrect,
> I've got to speak up.
I'm not sure where you disagree. But, synthetic DOT 3, 4, 5.1/4+
fluids exist, and are fine in most automotive applications. None of
the above are silicone based.
I can think of any number of valid reasons why silicone is not used. Namely:
- Silicone doesn't work with ABS systems
- Silicone can be aerated extremely easily (see above) and doesn't
give a great pedal feel
- Silicone won't eliminate rust problems. Instead of mixing with the
water, it'll separate out (to the bottom) where it will corrode
whatever's at the bottom of the brake system unless you bleed it
appropriately.
> I've never had to do it, but I think you use an alcohol to flush the lines.
Glycol *is* alcohol, and yet you wouldn't flush a system with it.
David, you're absolutely right to look beyond boiling points. I'm
pretty sure that the absorption rates among common samples are quite
different between DOT 3, 4, and 5.1/4+. Rumour has it that DOT 3 will
eat away at the natural rubber in some older British cars. No idea
how true that is, I don't own one.
--
alex
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Received on Fri Feb 10 16:47:30 2006
