How to Release Air Brakes
- 1). Start the truck by turning the ignition key to the "Start" position. Some trucks have a pushbutton ignition and will require turning the key to the "On" position then pressing the button to start the truck.
- 2). Locate the air pressure gauge on the dash. This gauge will be a small gauge labeled "Air Pressure."
- 3). Observe the needle in the air pressure gauge as it rises while the truck is idling. An indicator will make a buzzing sound as well.
- 4). Allow the air pressure to build to 120 pounds of air. The buzzing will stop at 60 pounds. You will hear the air bags settle under the truck once the pressure stops building.
- 5). Press the yellow button labeled "Parking" while your foot is on the brake pedal. This will release the truck air brakes.
- 6). Press in the red button labeled "Trailer" if a trailer is attached. This will release the trailer brakes. Keep your foot on the brake pedal to prevent the truck from rolling.
