GMC Sierra Owners Manual
Throttle and Brake Pedal Adjustment
On vehicles with this feature, you can change the position of the throttle and brake pedals.
The control used to adjust the pedals is located on the instrument panel below the climate control system.
Press the bottom of the control to move the pedals closer to your body. Press the top of the control to move the pedals away.
See Adjustable Throttle and Brake Pedal on page 9‑27.