Parking brake controller with slower actuation in the event of a malfunction

A hydraulic parking brake controller for controlling a parking brake on an output shaft of a motor vehicle in response to an operation unit, comprising;

• a primary control means for actuating at a first rate and releasing said parking brake in response to the operation of said operation unit;
• a secondary control means for actuating said parking brake at a second rate lower than said first rate in an instance in which said parking brake is in the released state and said operation of said operation unit malfunctions;
• said primary control means and secondary control means actuate and release said parking brake by means of hydraulic fluid;
• said primary control means being located between a hydraulic power source and said secondary control means, and said secondary control means being located between said primary control means and said parking brake;
• said primary control means being a directional control valve capable of directing the hydraulic fluid flow when said primary control means is in a first position so that the hydraulic fluid flows from the hydraulic power source toward said parking brake and in a second position so that said hydraulic fluid drains from said parking brake into a reservoir;
• and
• said secondary control means being a flow control valve which, when said secondary control means is in a first position supplies the hydraulic fluid from said primary control means to said parking brake and, when said secondary control means is in a second position supplies the hydraulic fluid in said parking brake to said primary control means while restricting the rate of flow.