Re: [DucatiST] Re: Brake question AKA why did this (seem) to work?

As a brake specialist is concur with Nick's assessment. Tricks don't
work only good solid physics. Bleed your brakes properly and you will
have no problems. Except of course when the fluid boils which is a
subject for a whole other discussion.

Gary '01 ST4 Gaston, OR

On 8/9/2011 11:18 PM, Nick Woods wrote:
>
>
>
> --- In st2_owners@yahoogroups.com
> <mailto:st2_owners%40yahoogroups.com>, Will Fulford
> <williford112000@...> wrote:
> >
> >
> >
> > It should hold up for you Huss. There was still a tiny bit of air in
> your system and the pressure you held on it overnight either allowed
> the bubble to release into the reservoir or dissipate into the fluid
> more evenly which is why it feels firm now.
>
> Sorry Will, I don't buy that! There is no way that air mysteriously
> finds it's way back into the reservoir, since all exits are barred
> when you do this trick. The only possible answer is that the
> compressible air actually dissolves into the fluid under sustained
> pressure, just like nitrogen does into the blood during deep diving.
> So, at least to start with, there is no more compressible air in the
> system, so the brake feels firm. However, just as in the bends in
> divers, releasing the pressure can allow the air to come back out of
> solution and make it's presence known again. I'm pretty sure that Good
> ol' Fariborz commented that riding at highish altitude had his brakes
> go soft again, which confirms this hypothesis.
>
> So, the trick works, but not in the way that 99.9% of bikers think it
> does, and it isn't a substitute for proper bleeding!
>
> NickW, UK
>
>

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