Hydraulic Control Unit
WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
The HCU modulates brake fluid pressure at each wheel with eight internal solenoids. A hydraulic pump motor circulates the brake fluid during anti-lock brake system cycling. The HCU is energized through the anti-lock brake control module by the hydraulic pump motor. The anti-lock brake control module is part of the EHCU and is located on left side of engine compartment, below master cylinder.