Bugs wrote:
People say the darndest things. The only thing dual pistons do is to
keep the whole caliper from moving. The forces on each pad are the
same. Its the same as pushing against the wall or pushing against
another person, the pressure is the same.

........ But the brake pad area is doubled. Twice the stopping force,
which is what we're talking about.
Bugs

At least absent context, this sounds incorrect. Doubling the area w/o
changing the normal force would not change the (dry) friction force.
Don't buy it? Remember that doubling the area (again keeping the normal
force constant) results in a lower pressure between the surfaces.

Bill