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Although dot 5.1 has a higher boiling point, it is never reached in a MTB. For that reason and because 5.1 goes stale more quickly than dot 4, is why I choose to use the latter.
Thanks for sharing, Duckman!Osmosis, and water vapour molecles are really small.
Although sealed against the the flow of large-volume liquid, the action of the pistons through the seals leaves a small film of fluid on the sides of the pistons, enough to attract water vapour molecules out of the air and suck them in. DOT 5.1 has a particularly voracious appetite for water vapour.
Although dot 5.1 has a higher boiling point, it is never reached in a MTB. For that reason and because 5.1 goes stale more quickly than dot 4, is why I choose to use the latter.