Hi Joerg,
You can easily switch between silicon brake fluid and your current glycol
(DOT3/4) based brake fluid.
It doesn't matter if some is left behind it may be mixed, although some
benefits of silicone based fluid will be reduced.
The advantage is that silicon fluid doesn't absorb moisture unless
conventional brake fluid which is hygroscopic.
However if you change the conventional brake fluid every two years corrosion
in the brake pipes should also be no problem.
Preventing corrosion is the main reason why silicon brake fluid is used.
But it also has its disadvantages:
first,silicone brake fluid will compress a bit more easily when the fluid
gets hot this will give a somewhat spongy feeling.
second, it is harder to bleed and dearate than normal brake fluid
third, it is more penetrative and may seep past seals on a worn brake system
which were tight when using the old brake fluid.
So generally I think it is best to use silicon fluid when you don't use the
car a lot otherwise stick with conventional brake fluid
and change it regularly.
Greetings
Adriaan Briene
http://members.tripod.com/RoverSD_1/index.html
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