Why might a driver choose to apply the parking brake before shutting off the engine at the end of a trip, rather than after?

Pick an answer

1. The order makes no difference to how the parking brake functions
2. It helps ensure the brake is applied while air pressure is still available to move the control smoothly
3. Applying the parking brake before shutdown is prohibited by regulation, inventing a rule that doesn't exist for what's actually just a practical sequence
4. Setting the parking brake before shutdown risks damaging the spring chambers

Correct!

Not quite. The correct answer is highlighted.