HCU (Hydraulic Control Unit): Description
WARNING: This page is about a different car, the 2002 Dodge Grand Caravan, 2002 Dodge Caravan, 2002 Chrysler Voyager, and 2002 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
The hydraulic control unit (HCU) is mounted to the CAB as part of the ICU (Figure ). The HCU controls the flow of brake fluid to the brake using a series of valve and accumulators. A pump/motor is mounted on the HCU to supply build pressure to the brakes during an ABS stop.
The HCU on a vehicle equipped with ABS and traction control has a valve block housing that is approximately 1 inch longer on the low pressure fluid accumulators side than a HCU on a vehicle that is equipped with only ABS.
For more information, (Refer to ICU (INTEGRATED CONTROL (UNIT) - DESCRIPTION ).