The part that causes the disc caliper piston to retract when the brakes are released is the square-cut O-ring.
The square cut seal is the most important part of a disc brake caliper, for keeping the brake behind the piston so that when you step on the brake pedal, it releases a pressure that applied to the piston which in return applies the pad to the rotor.
there are different types of power so ill show you all the examples of power.
Answer: mammals may be relatively better at solving problems than birds.
I'm not sure if a figure or some choices go along with this, but the closer to the sea floor the diver is, the lower the potential energy