| Standard, parking and emergency brakes | |
| Service, parking and emergency brakes | |
| Duty, parking and emergency brakes | |
| Parking and emergency brakes |
| Put on the parking brake and continuously pump the brakes | |
| Push the low pressure warning signal test button | |
| Release the parking brake and continuously pump the brakes | |
| Kink the service line |
| Air pressure falls to 0 psi | |
| Air pressure falls below 50 psi | |
| Air pressure falls below 100 psi | |
| Air pressure falls below 60 psi |