Why should you never rely solely on the dashboard air pressure gauge without also physically testing the brakes during a pre-trip check?

Pick an answer

1. The gauge only needs checking once a year during a formal inspection, though it only feels that way with check
2. Gauges never fail on air brake systems
3. Physical brake tests are only required once a year
4. A gauge can fail or read incorrectly, so a physical test confirms the brakes actually respond

Correct!

Not quite. The correct answer is highlighted.