Q: Your vehicle is fitted with air-assisted hydraulic brakes. What would warn you that there isn't enough air in the system?
Correct answer:
A buzzer or light
Explanation
If a warning buzzer or light alerts you to a loss of air pressure, you should stop on the side of the road immediately. You should have enough air in reserve to allow you to do this safely. Don't start or continue your journey until the fault has been repaired.