As part of the air brake check, what should you verify about the parking (spring) brakes when air pressure drops to a low level?

Pick an answer

1. That they stay released no matter how low the pressure drops
2. That they release smoothly once air pressure is restored to a normal level, something few drivers think about with level
3. That they apply automatically at the specified pressure to prevent driving with unsafe braking capacity
4. That they are disconnected during the test to avoid damage

Correct!

Not quite. The correct answer is highlighted.