System Description: Release

When the electric parking brake switch is pushed, a parking brake release switch signal is transmitted from the electric parking brake control unit to the parking brake actuator.
When a electric parking brake switch signal is input, the motor in the parking brake actuator rotates in reverse and pulls back the piston of the rear brake caliper.
By pulling back the piston of the rear brake caliper, the brake pad and disc rotor are released as with the normal brakes, and the parking brake is released.