Quote:
Originally Posted by lazzer408
Just imagine if you cut off some of your brake shoe. Would your braking be worse? Ofcorse it would. It would take more force on the smaller shoe to create the same amount of friction.

Incorrect.. if you halved the area of the pad but kept the same normal force applied to it, it would work better (discounting heat dissispation/fading). The only two things that matter are force applied and coefficient of friction. Here's a quote from a website that explains this in more detail... all you engineer/physics types need not read further.
"
Standard friction equation
When a force is applied to an object, the resistive force of friction acts in the opposite direction, parallel to the surfaces.
The standard equation for determining the resistive force of friction when trying to slide two solid objects together states that the force of friction equals the coefficient friction times the normal force pushing the two objects together. This equation is written as
Fr = μN
where:
•Fr is the resistive force of friction
•μ is the coefficient of friction for the two surfaces (Greek letter "mu")
•N is the normal or perpendicular force pushing the two objects together
•μN is μ times N
Fr and N are measured in units of force, which are pounds or newtons. μ is a number between 0 (zero) and ∞ (infinity).
Applies to static and kinetic
This equation applies to both static and kinetic sliding friction. Static friction is the friction before an object starts to slide. Kinetic friction is the friction when the object is actually moving or sliding.
Static friction and kinetic friction have different coefficient of friction values.
Independent of area for sliding hard surfaces
An interesting result of this equation is that in the case of sliding friction of hard surfaces, the friction is independent of the area of the surfaces. In other words, it is just as difficult to move a 1 squarecm object as a 1 squaremeter object, if they both are pressed to the surface with the same amount of force.
This is not intuitive. You would think that there is more friction when the surfaces are larger, but the friction equation states otherwise. You can verify this fact with experiments."
I'd imagine the MX6 clutch would work better but it would be because of its larger diameter having slightly more mechanical advantage rather than the increase in area.