HAC (Hill-start Assist Control) supports drivers on steep hills, while DAC (Downhill Assist Control) supports drivers when descending slopes.
There may be unexpected cases for the driver where the vehicles may slide when starting on sudden hills or slippery surfaces. HAC minimizes vehicle roll-back by controlling brake fluid pressure as the driver's foot is removed from the brake to the accelerator on such steep incline.
Furthermore, DAC maintains vehicle speed at 5km/h to help ensure vehicle stability when descending sharp slopes or slippery surfaces.
Without the HAC system, backward rolling or slippage occurs in steep inclines.
The HAC system helps increase control on steep upgrades and prevents individual wheels from locking.
Without the DAC system, wheels lock when pressing the breaks in steep slopes.
The DAC system improves directional control during descent on steep or slippery surfaces.