This section tells you about air brakes. If you want to drive a truck or bus with air brakes, or pull a trailer with air brakes, you need to read this section.
Air brakes use compressed air to make the brakes work.
Air brakes are a good and safe way of stopping large and heavy vehicles, but the brakes must be well maintained and used properly. The service brake system applies and releases the brakes when you use the brake pedal during normal driving. The parking brake system applies and releases the parking brakes when you use the parking brake control. The emergency brake system uses parts of the service and parking brake systems to stop the vehicle in the event of a brake system failure. The parts of these systems are discussed in greater detail below.