Hydraulic Control Unit (HCU)
| ITEM | DESCRIPTION |
|---|---|
| 1 | Anti-lock Brake System (ABS) control module |
| 2 | Secondary circuit port |
| 3 | Left front caliper port |
| 4 | Right front caliper port |
| 5 | Primary circuit port |
| 6 | Left rear caliper port |
| 7 | Right rear caliper port |
| 8 | Hydraulic Control Unit (HCU) |
The Hydraulic Control Unit (HCU) is located on the rear left side of the engine compartment and is an integral component with the Anti-lock Brake System (ABS) control module. The HCU is a four channel unit that modulates the supply of hydraulic pressure to the brakes under the control of the ABS control module.
The primary and secondary outlet ports of the master cylinder are connected via 8mm (0.315in) diameter brake pipes to the primary and secondary circuits of the HCU. The primary circuit in the HCU provides two separate outlet ports to the right front and left rear brakes. The secondary circuit in the HCU provides two separate outlet ports to the left front and right rear brakes.
The HCU incorporates three brake operating modes as follows:
- Normal braking/Electronic Brake Force Distribution (EBD).
- ABS braking.
- Active braking.
As the HCU and ABS module is a fully integrated unit, details of the HCU and ABS functionality, including the three braking modes, are contained in the Anti-Lock Control - Traction Control section of the manual.
For additional information, refer to: ANTI-LOCK CONTROL - TRACTION CONTROL