How many drivers flush their brake fluid annually?

Tom

Maybe it was the corrosion that I was told about, and hmmm I thought
corrosion was a chemical reaction.  :-)

I have a friend who works for USPS as a vehicle technician in CA.  He was
one of the techs that changed over the brake fluid systems over to DOT 5 and
also had to correct the damage that it did to the systems within the year of
the changeover.  He laughed and said "good job security."
AFAIK The military uses DOT 5 more than most.  <g>

Porsche Club of America http://www.pnwr.org/track/driver_ed/rules.asp does
not recommend DOT 5 and states "Silicone (DOT 5) is not recommended for
street or track use."

other sites to read:
http://www.h-e-l.co.uk/HEL_Performance_Brake_Doctor_FAQ.htm

Initially DOT 5 has a higher boiling point that DOT 3 and DOT
4.............but........
You really want to go here and read about a little water lowing the boiling
point more with DOT 5 than with either DOT 3 or DOT 4.  8^o
http://www.school-bus.org/World/US/States/Florida/Vehicle_Maintenance/Vehicle.htm

READ HERE TOO:  http://www.motorspot.com/motulin.html
Interview.... Motorspot talks with Mr. Dave Wolman of Motul USA
" I do not recommend silicone brake fluids at all. They are fine for a car
that is not pushed very hard. One nice thing about silicone is that if you
have a leak, it won't eat up the paint. On the other hand, when silicone
gets warm it starts to be compressible. It is one of the few fluids in the
world that is actually compressible as it gets hot. When you near what the
boiling point is of silicone brake fluid, it actually has become
compressible and you lose your brakes."

Now there may be a DOT 5.1 that might be compatible with DOT 3 and DOT 4,
but with a higher boiling point!
Most DOT 5 fluid has a higher temp rating than the typical DOT 4 fluid
you buy off-the-shelf.  But maybe you can find 650+(?) DOT 4 in racing type
stores.

Be safe!
later,
dave