| Air brakes | |
| Trailer brakes | |
| Cab brakes | |
| Emergency and parking brakes |
| Never | |
| Weekly | |
| Monthly | |
| Daily |
| Captures air that has been delivered to the brakes but was unused | |
| Ensures that the air storage tanks are properly pressurized | |
| Delivers air from the air storage tanks to the brakes | |
| Delivers air from the air compressor to the brakes |