Hydraulic Control Unit
| ITEM | DESCRIPTION |
|---|---|
| 1 | Anti-lock Brake System (ABS) control module |
| 2 | Rear right brake outlet port |
| 3 | Front left brake outlet port |
| 4 | Front right brake outlet port |
| 5 | Rear left brake outlet port |
| 6 | Primary circuit inlet port |
| 7 | Secondary circuit inlet port |
| 8 | Hydraulic Control Unit (HCU) |
| 9 | Electrical connector |
The Hydraulic Control Unit (HCU) is an integral part of the Anti-lock Brake System (ABS). The ABS control module is mounted on the rear face of the HCU. The HCU is installed opposite to the driver's side of the engine compartment. The HCU is secured to a bracket, which is located between the bulkhead panel and the suspension top mount.
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 brake 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 right and the rear left brakes. The secondary circuit provides hydraulic pressure to 2 separate outlet ports for the front left and the rear right brakes.
The HCU has 3 brake operating modes as follows:
- Normal braking/Electronic Brake Force Distribution (EBD)
- ABS braking
- Active braking.