Electric Motor Pump
WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
 Courtesy of HYUNDAI MOTOR AMERICA
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The ESP supplies Battery power to the electric motor by way of a motor relay which is controlled by the Electronic Control Unit (ECU).
The electric motor pump supplies hydraulic pressure to all wheel brake calipers by operating the piston inside the pump.