HCU (Hydraulic Control Unit): Description

The hydraulic control unit (HCU) is mounted to the ABM as part of the ICU. See Fig 1. 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.

Fig 1: Integrated Control Unit

Courtesy of DAIMLERCHRYSLER CORP.