Hydraulic Control Unit (HCU)
WARNING: This page is about a different car, the 2023 Ford Bronco Sport. However, it is still accessible from the selected car via links, so may be relevant.
Vehicles equipped with a vacuum brake booster are also equipped with an HCU.
The HCU contains the solenoid valves, the hydraulic pump motor and the pressure sensor used by the ABS for the ABS and stability control systems. While the ABS module can be serviced separately from the HCU, a new HCU comes with a new ABS module.