Brake by wire

An electrohydraulic brake system, comprising:

• at least one hydraulic brake;
• a brake sensor;
• and
• an electrohydraulic actuator assembly having at least one electrohydraulic actuator (EHA) unit operable to receive a signal from the brake sensor or ADAS ECU, the EHA unit including an electric motor, a reduction unit driven by the electric motor, and at least one fluid pump,
• wherein the fluid pump is a gerotor pump,
• wherein the gerotor pump includes a pump rotor that rotates with respect to a corresponding eccentric ring within a pump ring, and wherein a lock ring is disposed between the eccentric ring and pump ring, and
• wherein the pump rotor, eccentric ring, pump ring, and lock ring are sandwiched between a back plate and a front plate and wherein one of the pump ring, the back plate, and the front plate includes a surface coating for providing axial clearance to the pump rotor.