The truth is that all the intermediates between humans and their ancestors (which diverged from the common ancestor of humans and chimpanzees) are now extinct (and there was likely no fundamental distinction between humans and their ancestors).
Rim brakes. Rim brakes are so called because braking force is applied by friction pads to the rim of the rotating wheel, thus slowing it and the bicycle. Brake pads can be made of leather, rubber or cork and are often mounted in metal shoes. Rim brakes are typically actuated by a lever mounted on the handlebar.
Brake Caliper Piston Products. In disk brake systems, the brake calipers are the ones that squeeze the brake pads against the disk or rotor of a wheel. One of the parts that make this squeezing action possible is the Brake Caliper Piston. When you step on the brakes, the pressure made by the brake booster or the master cylinder pushes the brake fluid through the fuel lines and out of the cylinders in individual wheels.