HCU (Hydraulic Control Unit): Description

The hydraulic control unit (HCU) is mounted to the CAB as part of the ICU (Figure ). The ICU is located in front of the driver's side front tire, behind the inner fender splash shield. The HCU controls the flow of brake fluid to the brakes using a series of valves 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 traction control has a valve block that is approximately one inch longer than a HCU on a vehicle that is equipped with ABS only in order to incorporate the additional valves.

For more information, refer to the ICU. (Refer to ICU (INTEGRATED CONTROL UNIT)   )