Even a tiny air bubble can make brakes feel spongy. On trials bikes,
where instant solid brakes are real important, they use water because
it makes it easy to bleed the brakes. If you are using water, you just
put the whole brakes in a bucket and work it, tap and turn, to get out
that last tiny bubble.
However, proper brake fluid will feel just as good, if they have zero
air in them. It just takes more skill then the "bleeding them in a
bucket of water" method, to get all the air out.
I see one other possible advantage. Brake fluid absorbs water from the
air. On motorcycles, we change the fluid every year to avoid wheel
lock, if the water contaminant boils. But then again, I guess the
brakes on uni's and bikes don't get as hot. If they did you couldn't
use water.
--
feel the light
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