A foot-operated parking brake system includes a rotor assembly rotatable in an interlocked relation with a parking brake pedal and having two reels. Coils are wound around the respective reels for holding the rotor assembly yieldingly fixed with a predetermined fastening force and thereby holding the parking brake pedal in its brake applied position. The rotor assembly can be released from the fastening force by twisting the coils in unwinding directions thereof and thereby reducing respective fastening forces exerted by the coils beyond the bias of a coil which urges the parking brake pedal toward its brake released position.
