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  • Activated by pushing a button that’s easy to reach, this available feature uses antilock braking to help for a smooth and controlled hill descent in rough terrain without you having to touch the brake pedal. You must always use your brake pedal for immediate slowing or stopping.
  • With Hill Start Assist, sensors automatically detect when Sierra is on a 5 percent grade or more. The system holds the brakes momentarily, under certain conditions, or until the accelerator is pressed, preventing rollback.