I have a question to insert in this thread here. I have a GT6 and
the Master is shot. My options are to find a place to rebuild it or to
replace it. I have toyed with the option of using a MC from a spitfire as
they are more common and relatively the same. The MC from a spit though,
seems to be slightly smaller in diameter. If I were to use the one from the
spit, according to your info here, you say that I will be able to apply more
pressure force at the pads with the smaller diameter MC. Or do I have it
backwards and it will take more pressure to exert the same amount of force
at the pads. Or am I wrong altogether?
> Actually the same pressure over a smaller area would result in a smaller
net
> force applied to the pads.
>
> Brake hydraulic pressure is independent of slave cylinder size. Pressure
is
> given by the ratio of the force applied to the master cylider piston and
its
> diameter. (50 lbs appied to a 1/2 inch square surface = 100 lbs/inch
> square). The force applied to the brakes is that pressure multiplied by
the
> area of the slave cylinder. The ratio of the master to slave cylinders
gives
> the amount of travel required to actuate the system. Thus if the area of
the
> slave is 3 times the master, then the slave will travel 1/3 the amount the
> master travels. However this ratio will have no impact on the pressing
force
> once the slave is tight against the pads and disk. That force, as
previously
> mentioned, is entirely dictated by the pressure from the master multiplied
> by the slave piston area.
>
> The reason that one cannot have enormous forces applied to the disks is
that
> the pedal travel becomes unreasonable. With a tiny master cylinder piston
> and a huge slave cylinder one could press the disks flat. However one
would
> arrive at a ridiculous situation of a multi-foot pedal travel giving a
> micrometer movement of the pads. Bearing movement would soak that up
> immediately.
>
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