Cruise control buttons are generally used to adjust the speed of the vehicle to a desired level. However much like cruise control, driver pressure to the accelerator or brake pedal will override the HDC system, although this is generally vehicle design dependent. The basic idea of Hill Descent Control is to insure drivers can be confident that even the ride down hills with slippery or rough terrain will be controlled and safe.
Hill Descent Control (HDC) as the name suggests is designed to allow drivers to smoothly hill descent in rough terrain without driver intervention, in otherwords the system gives assistant to the car by slowing each wheel individually to insure that the vehicle does not go past the desired speed, th HDC system is generally linked with the ABS system.
Hill Descent Control (HDC)