Hydraulic Control Unit (HCU)
WARNING: This page is about a different car, the 2018 Jaguar XE and 2017 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
The HCU is a four channel unit, secured to a mounting bracket located rearwards of the front suspension turret on the opposite side from the driver's position. The HCU modulates the supply of hydraulic pressure to the brakes under the control of the ABS control module.