Rio L4-1.5L (2001)
Hydraulic Control Assembly - Antilock Brakes: Description and Operation
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.
Reference
Diameter of front brake pipe holepitch:
FL, RL: 0.47 inch (12 mm)
Diameter of rear brake pipe holepitch:
FR, RR: 0.39 inch (10 mm)
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.
ABS module
The ABS module illuminates the ABS warning lamp when an ABS failure occurs.
