From: W. J. Buzz Szarek (buzz@toast.net)
Date: Sat Jul 06 2002 - 21:21:35 PDT
Most brake fluids are hygroscopic. They attract and retain water. This
causes the brake components to rust, especially if neglected.
Dot 5 is not hygroscopic.
It has a lower boiling point and is more elastic (compressible) so in heavy
duty applications it's not recommendend.
It's taken the modern world by storm simply because it protects brake
components from rust. In a vehicle that isn't used often this is a major
plus. If the vehicle is used often and in severe environments where every
ounce of stopping ability is required then it's ill advised unless the brake
system is specifically designed to accommodate its elasticity (additional
margin required in the design).
Does that help?
-=-
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