I think the problem with slide arm setup is the flex that you get. This leads to
more pressure exerted at the outer edge of the rim than the inner (maybe better
for cooling!), with opposing pistons the caliper body would be a lot stiffer
than the effective body of the sliding arm type. The step from 2 to 4 piston
calipers (and 6 piston) allows the pressure to be distributed more evenly across
the area of the pad. Resistance is not exactly equal to the normal force
multiplied by the coefficient of friction. High pressure spots would lead to
localised regions of overheating on the pads, which could reduce the
effectiveness of the part of the pad that is doing the most work. Just my
thoughts on the debate. Remember most race cars use 4 and 6 pot calipers for a
good reason. The amount of force developed is still down to your leg (plus
booster) pushing the fluid hard enough to create the desire pressure, the rest
is just ratios of cylinder areas and a trade off between peddle drop (smaller
m/c = larger pressure for the same leg generated force) and the feeling of a
hard brake peddle.
Luke Clough
Brad HALLETT wrote:
> Thrill seekers
> I too agree that the force exerted on each side would be close to equal, as
> there is no real mechanical advantage or disadvantage afforded by the
> slide-arm setup (want of better wording). Some force would have to be lost
> in the transfer though, due to heat, binding of components etc, and a lag in
> activation would occur as the system relies on the cylinder side to apply
> pressure before activating the non culinder side. I still think two or four
> pots are the way to go simply due to the even and immediate distribution
> applied to the rotors. Doesn't make a hell of a difference to braking, but
> component wear and reliability would have to be enhanced.
>
> Regards
> Brad HALLETT
> http://www.powerup.com.au/~bhallett
>
> http://www.datrats.com.au for all Datsun performance equipment!
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