I just did some research and found the answer. One side of the caliper pushes the pistons out, which force one side of the onto the disc. The force continues, and since the piston side is hard on the disc, this makes the entire caliper body slide along the rails which pulls the other side onto the disc...Sorry guys.
Here is the article I found which explains this.
The basic answer is that once the piston is extended to its max, the entire caliper body then slides equalizing the value on both sides.
"Why pressure from only one side?
This can be a little confusing and some very smart people have gotten caught. But it really isn’t that hard to understand if we shift our thinking a bit. First, ignore whether or not the caliper is fixed or floating; it doesn’t matter, and in a minute you’ll see why.
Imagine that you are holding a book between your two open hands. Now squeeze on the book. If your left hand is pushing with 25 pounds of force, then your right hand has to push back with that much force or the book will move across your chest. Each of your hands is a brake pad, and the book is the rotor. The force between the pad and the rotor is only 25 pounds, not 50. And it is the force between pad and rotor that determines the frictional force generated on the brake rotor.
In this respect there is no difference between floating and fixed calipers. The other side just acts to keep the rotor centered in the caliper, one moves the whole caliper, the other moves the other pistons.
But wait! There are still two pads, one on each side. If we replace one pad with a ball bearing surface the force on the rotor from the brake caliper would be reduce about half. So we have to count both pads, but using the force generated by one side of the pistons."
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