Skeeve Posted July 26, 2010 Share Posted July 26, 2010 As mentioned, but to elaborate, the dry boiling point accurately reflects the boiling point of the fluid. But being hygroscopic, it absorbs water.[snip] A lot to be said for some of the push-bike disc brake systems settling on mineral oil; actively repels water, keeps the parts lubed! Of course, it may have too great a coefficient of expansion to be used in a brake system that heats up a lot; push-bikes aren't known for heat-related brake fade... Link to comment Share on other sites More sharing options...
GuzziMoto Posted July 26, 2010 Share Posted July 26, 2010 A lot to be said for some of the push-bike disc brake systems settling on mineral oil; actively repels water, keeps the parts lubed! Of course, it may have too great a coefficient of expansion to be used in a brake system that heats up a lot; push-bikes aren't known for heat-related brake fade... Some KTM's use mineral oil in the hydro clutch. Not sure how well it would cope with the 400 plus degrees that can be generated by stopping a 500 lb Guzzi, but you do not want to mix and match the two. DOT 5 is the same way with water, but it is not incompressible (is that a word?). That results in a soft lever. No one wants a soft lever, do they? Link to comment Share on other sites More sharing options...
gavo Posted July 28, 2010 Share Posted July 28, 2010 Breakfluid is hygroscopic. So the dry boiling point applies as long as the fluid is freshly filled up from a sealed container only. When the B/F will have become wet depends on several things. The climate you're located in, how well sealed your brake system is and so on. I think changing the fluid every two years or so is a proper interval to keep you on the safe side. But remember - the B/F is hygroscopic also in the can you bought it in. The water saturation level can be determined by a good shop, by the way. Hubert Yea I know it's hygroscopic, so how do they arrive at the wet boiling point , must the fluid contain a certain pecentage of water to be classed as unsafe , how do the calculate it Link to comment Share on other sites More sharing options...
Dan M Posted July 28, 2010 Share Posted July 28, 2010 Yea I know it's hygroscopic, so how do they arrive at the wet boiling point , must the fluid contain a certain pecentage of water to be classed as unsafe , how do the calculate it Measured at 3% water content. Link to comment Share on other sites More sharing options...
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