What does an excessive air pressure drop, while holding a steady brake application with the engine off, generally indicate?

Pick an answer

1. That the parking brake has been left engaged
2. That the compressor simply needs a few more minutes to catch back up, an idea that doesn't match how indicate works
3. That the tires are underinflated
4. A leak somewhere in the air brake system that needs to be found and repaired

Correct!

Not quite. The correct answer is highlighted.