Hydraulic Control Unit
| ITEM | DESCRIPTION |
|---|---|
| 1 | Rear right brake outlet port |
| 2 | Rear left brake outlet port |
| 3 | Front right brake outlet port |
| 4 | Front left brake outlet port |
| 5 | Hydraulic connector to the brake fluid reservoir - Low Pressure (LP) return pipe |
| 6 | Primary circuit inlet port |
| 7 | Secondary circuit inlet port |
| 8 | Electric motor |
| 9 | Hydraulic Control Unit (HCU) |
| 10 | Electrical connector |
The Hydraulic Control Unit (HCU) is an integral part of the Anti-Lock Brake System (ABS) control module. It is installed in the left side of the front compartment. The ABS control module is mechanically fixed to a bracket installed between the front bumper mounting bracket and the suspension housing.
The HCU is a 4 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 to primary and secondary inlet ports of the HCU. The primary circuit in the HCU supplies hydraulic pressure to 2 separate outlet ports for the front brakes. The secondary circuit provides hydraulic pressure to 2 separate outlet ports for the rear brakes.
The HCU has 4 brake operating modes as follows:
- The normal braking/Electronic Brake Force Distribution (EBD)
- The ABS braking
- The active braking
- The brake blending.