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

["Guy Weller" <Guy.Weller@xxxxxxxxxxx>]

I have been told (on another list) that as DOT 5 fluid, being
non-hygroscopic, does not absorb water vapour.  This is good as regards not
altering the boiling point and therefore not causing SPS (spongy pedal
syndrome)

BUT, any water vapour that does get into the system, is not absorbed and
therefore condenses as water droplets.  These coalesce and collect within
parts of the system where the prescence of water can cause rusting.

 I am not sure of the logic here.. how does water moisture get into what is
essentially a closed system?/  Anyway, that was the tale.  Make of it what
you will.

Guy
----- Original Message ----- 
From: "Dean W. Cains" <dwc@domain.elided>
To: <alfa@domain.elided>
Cc: "Peter Webb" <webb.p@domain.elided>
Sent: Monday, September 15, 2003 5:47 AM
Subject: [alfa] Re: Clutch Master Cylinder Rebuild Questions- 69 Spider


> 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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