[alfa] Re: Clutch Master Cylinder Rebuild Questions- 69 Spider

["Dean W. Cains" <dwc@xxxxxx>]

Hi Peter:

Silicone fluid is completely non-hygroscopic, i.e. it absorbs no 
water.  Problem is it's about 15% dissolved air, and I've never been able 
to get a firm enough pedal for my tastes.  I used to drive British cars and 
tried it on a few XKE's with no success.  Also tried it in my M3, and still 
had the soft pedal.  DOT 3/4 fluids can also have very high boiling points, 
but as soon as any water is absorbed, it lowers dramatically, while DOT 5's 
stays the same.  So, it's a lesser of two evils kind of choice.  I'd rather 
have the firm pedal, and change DOT3/4 fluid quite often.

Regards,

Dean
Lutz, FL
'74 & '87 Spider Veloce's


At 09:09 PM 9/14/2003, you wrote:

> Date: Sun, 14 Sep 2003 14:09:38 -0500
> From: "Peter Webb" <webb.p@domain.elided>
> Subject: RE: [alfa] Clutch Master Cylinder Rebuild Questions- 69 Spider
>
> From all I've read, silicone DOT5 fluid is more hydroscopic than DOT4
> mineral and DOT5.1 synthetic.  Do you get less moisture absorption from the
> silicone?   I always understood it was for higher temperatures.
>
> - -Peter
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