Why is contaminated air in an air brake system dangerous?

Pick an answer

1. It only triggers a dashboard light, leaving actual stopping power untouched
2. It makes the air compressor louder because it has to cycle more often, but that noise alone doesn't reduce stopping power
3. It only affects fuel economy, not braking
4. Moisture or oil in the air supply can damage valves and freeze in cold weather, causing brakes to fail

Correct!

Not quite. The correct answer is highlighted.