Hydraulic Control Unit (HCU)

The HCU consists of a motor pump assembly in which motor sensor is built, and valve block for controlling ABS pressure.

Motor sensor is built in motor, and output signal, which detects condition of a motor pump assembly, is sent to ABS control unit.

1. Reference 
   1. Diameter of front brake pipe hole pitch: 
      1. 12 mm (FL, RL) 
   2. Diameter of rear brake pipe hole pitch: 
      1. 10 mm (FR, RR) 

The motor pump is a reciprocal 2-line pump and transmits enough pressure to the wheel system, and the valve block controls fluid pressure to each wheel cylinder.

Fig 1: Identifying ABS Hydraulic Control Unit (HCU)

ABS module 

The ABS module illuminates the ABS warning lamp when an ABS failure occurs and ABS wiring harness connector is disconnected.