Quote:
Originally Posted by cossie1600
you should always compare the wet boiling point, not the dry since you should assume there is some type of moisture in the system or bottle already
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If you plan on keeping brake fluid in the vehicle for over two years, then, yes, wet boiling points should be compared. Brake fluid, if made and stored correctly before use, absorbs about
1.5-2.0% moisture per year while in the vehicle. Most of this moisture comes through the OE rubber brake lines -- another argument for upgrading to stainless steel braided Teflon hose. It is also an argument against pressurized brake bleeders that don't have diaphragms.
Since the SAE WERBP (Wet Equilibrium Reflux Boiling Point) test measures wet boiling points at
3.5-4.5% typical moisture content (
the reference fluid is at 3.70% +/-.05%), we should only be concerned with the wet boiling point if we stay with OE rubber lines, use cheap pressure bleeders and aren't that concerned with regular maintenance. If, as enthusiasts, we choose to keep up on maintenance and use better lines and bleeding methods, the
dry boiling point is much more relevant to our use.
Chris
09-22-2010, 12:49 PM
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