Actually, The question came up in relation to the clutch slave rather than
brakes. The delimma I had was whether to use a larger or smaller slave
cylinder. The explanation I got is that since the pressure exerted by the
master cylinder was constant, the smaller slave cylinder would receive that
constant pressure spread out over a smaller area and therefore give more force
than a larger cylinder.
Think about it this way: If the master and slave cylinders were the same size,
the force of your foot would be what is driving the clutch. As the
size of the slave is reduced and the master left alone, the resulting pressure
on the clutch would increase. Therefore, smaller creates more pressure
in relation to the master. I can't find any fault with that argument.
oe
Randall wrote:
>
> Joe :
>
> It gets confusing here, since there are many different places to measure
> pressure.
>
> The force exerted by a hydraulic piston is the hydraulic pressure times
> the area of the piston. So, if the system pressure stays the same, a
> larger slave piston means more force applied to the shoes.
>
> Perhaps your authority said the _pedal_ pressure (or the hydraulic
> pressure), would be higher with a smaller cylinder (for the same braking
> force). Or, perhaps he was talking about the master cylinder (where a
> smaller piston gives you more braking force for the same pedal
> pressure).
>
> Randall
>
> Joe Curry wrote:
> >
> > Someone (who is supposed to know these things) once told me that if you use
>a smaller wheel (or slave) cylinder, you will actually get a higher
> > pressure than if you use a larger one. It makes sense to me since the
>ratio between the size of the master and slave cylinders is what determines the
> > pressure exerted on the thing that the hydraulics are driving.
> >
> > So, would going to a smaller wheel cylinder give you lower pressure?
>According to this source, it would be greater.
> >
> > Anyone care to weigh in on this issue?
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