During a pre-trip air brake check, you should confirm air pressure builds from a low level to a safe operating range within about how much time, according to general guidance?

Pick an answer

1. It doesn't matter how long it takes as long as it eventually builds up
2. A reasonably short, specified time while the engine runs at a fast idle, not an unlimited amount of time
3. Only the time to reach maximum pressure matters, not the time needed to reach a safe range for driving
4. Build-up time is not something a pre-trip inspection checks at all

Correct!

Not quite. The correct answer is highlighted.