This is actually backwards, Dot 5 does not absorb water. Dot 5 is silicon based and was developed to be used in cars where excessive moisture would cause problems. Dot 5 also has a higher boiling point and offers better corrosion, rust resistance and generally lasts longer than Dot 4. I don't see any advantage to changing. Incidentally, I'm running the Wilwood brakes on mine with no issues.
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Originally Posted by bobcowan
Why? You've been driving it like that 17 years. What makes you want to change now?
The big problem with 5 is that it can attract water, which then ends up in the calipers. And that's bad for a number of reasons. As long as you flush the system with new DoT 5 fluid regularly, it won't be an issue.
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