The CDL license test for air brakes covers:
Parts of an air brake system
Dual air brakes
Inspecting air brakes
Using air brakes
If you intend to drive a truck or bus with air brakes, or pull a trailer with air brakes, you must know about air brakes. Our CDL practice test covers air brakes.
Air brakes use compressed air to make the brakes work. Air brakes are a good and safe way to stop large, heavy vehicles, but the brakes must be well maintained and used properly.
Air brakes are three different braking systems: the service brake, the parking brake, and the emergency brake.
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 a brake system failure. Our CDL practice test covers emergency brakes.