ELECTRONIC PARK BRAKE SYSTEM WITH VEHICLE MOTION STATE INPUT

An electronic park brake system includes a first electronic control unit configured to receive and compare at least first and second speed inputs and provide a quality indicator signal indicating a quality of a vehicle speed signal being delivered to an electronic brake control unit. The electronic park brake control unit is configured to receive the quality indicator signal and the vehicle speed signal, determine a motion state of the vehicle and maintain a full operational state of an electronic park brake if the quality indicator signal is a high quality signal, and limit the operational state of the electronic park brake if the quality indicator signal is a medium quality signal or a low quality signal. Methods of using the system are also provided.