BearTranserv@aol.com wrote:
>
> Randall, this seems to conflict with what I have heard on other lists.
> While DOT 5 is not water soluble, and will not absorb water like the other
> fluids, any water that accumulates in the MC and makes it's way to the brake
>lines
> can linger there a separate bubbles of water and rust the components from
>the
> inside out.
>
It's my understanding that water absorbed in DOT 3/4 not a problem. The problem
is caused by the
water that is not absorbed. That is, when the DOT 3/4 absorbs enough moisture
to become saturated,
then the rest becomes liquid and rusts the brake system components. Since the
DOT 3/4 becomes
saturated in a few months, it seems there isn't any difference (in that
respect) between, silicone
and DOT 3/4.
The absorption thing also beings up a point that has always troubled me. Why
are the DOT 3/4
manufacturers so hyper about not using fluid from a once opened can. The MC is
vented to the
atmosphere, so it absorbs moisture until it's saturated anyway. Seems after a
couple of months the
DOT 3/4 in car has a lot more moisture in it than a can that was opened for a
few seconds and
resealed. I understand there is now air in the can, but there is air in the MC
as well and it's vented.
Don Malling
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