Hydraulic Control Unit
The Hydraulic Control Unit (HCU) is an integral part of the Anti-lock Brake System (ABS). The ABS control module uses the HCU to control all of the braking and stability functions by modulating hydraulic pressure to the individual brakes.
For additional information, Refer to: ANTI-LOCK CONTROL - STABILITY ASSIST - V8 S/C 5.0L PETROL .