The component in a disk brake unit acts as a return spring and allows the pad to move away from the rotor is the Square cut seal or Caliper piston seal . This is the component in the brake caliper which acts as a retracting mechanism in the piston when hydraulic pressure is released. It functions as a return spring to retract the piston.
Explanation:
There are many different kinds of pain scales, but a common one is a numerical scale from 0 to 10. Here, 0 means you have no pain; one to three means mild pain; four to seven is considered moderate pain; eight and above is severe pain.