Not ignorance just have not had experience with the problem.  The brake
master cylinder in our Westy Syncro used to leak fluid on the floor mat in
subzero temperatures do to differential contraction.  It was fine in warmer
weather but when cold leaked.  The replacement does not and the pedal feels
much more firm now.

Mark in AK
On Tue, Feb 2, 2010 at 5:01 AM, Dave Mcneely <mcneely4@cox.net> wrote:

> differential contraction of parts can allow fluid bypass more readily, I
> think.  Though I have heard it suggested that if bypass is a sometime
> problem, cold will make it less likely because the cylinder itself
> contracts, while the piston is rubber and doesn't.  But I guess my ignorance
> is showing.  David Mc
>
> >
> >>
> >
> > Ryan
> >
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