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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.