Hydraulic Control Unit
| ITEM | DESCRIPTION |
|---|---|
| 1 | Anti-lock Brake System (ABS) control module |
| 2 | Rear right brake caliper port |
| 3 | Front left brake caliper port |
| 4 | Front right brake caliper port |
| 5 | Rear left brake caliper port |
| 6 | Primary circuit port |
| 7 | Secondary circuit port |
| 8 | Hydraulic Control Unit (HCU) |
The Hydraulic Control Unit (HCU) is located on the front left side of the engine compartment, behind the left headlamp and is an integral component with the Anti-lock Brake System (ABS) control module. 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 through 8 mm (0.315 in) diameter brake pipes to the primary and secondary circuits of the HCU. The primary circuit in the HCU provides 2 separate outlet ports to the front right and rear left brakes. The secondary circuit in the HCU provides 2 separate outlet ports to the front left and rear right brakes.
The HCU incorporates 3 brake operating modes as follows:
- Normal braking/Electronic Brake Force Distribution (EBD).
- ABS braking.
- Active braking.
For additional information, refer to: HYDRAULIC BRAKE ACTUATION - VEHICLES WITH: MHEV/NON-ELECTRIC VEHICLES .