Schematic Of HCU: Notes
| Item | Part Number | Description |
|---|---|---|
| 1 | - | Master cylinder |
| 2 | - | Reservoir |
| 3 | - | Brake booster |
| 4 | - | Brake pedal |
| 5 | - | HCU |
| 6 | - | Pressure sensor |
| 7 | - | Priming valve |
| 8 | - | Pilot valve |
| 9 | - | Return pump motor |
| 10 | - | Return pump |
| 11 | - | Inlet valve |
| 12 | - | Relief valve |
| 13 | - | Accumulator |
| 14 | - | Outlet valve |
| 15 | - | Left front brake |
| 16 | - | Right front brake |
| 17 | - | Right rear brake |
| 18 | - | Left rear brake |
The HCU has three operating modes: Normal braking/EBD, ABS braking and active braking.