Here's a small snippet from a tech site I subscribe to. Not a bad idea to
believe it!
Paul A
As for brake fluid, every brake job (complete or not) should include a fluid
change. But surveys have found that half of all cars and light trucks that are
10 or more years old have never had their brake fluid changed!
You can't really judge the condition of the brake fluid by its appearance.
Brake fluid may darken as it becomes contaminated with moisture, but some
fluid does not. The most accurate way to check the condition of the fluid is
to use an electronic tester that boils a small sample of fluid, or to use
chemical test strips that react to the corrosion inhibitors and trace copper
in the fluid.
Tests have shown that after only a year of service, the brake fluid in the
average vehicle can contain as much as 2% water. After 18 months, the level of
contamination can reach 3%, and continue to climb to as much as 8% or more as
time goes on.
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