New Jersey Air Brakes Practice Test

Which scenario is not a proper time to apply the parking brakes?

1. If the vehicle is parked on level ground

2. When the brakes are very hot

3. When leaving the vehicle unattended

4. When the vehicle is stopped

The correct answer is: When the brakes are very hot

Applying the parking brakes is critical for preventing unwanted vehicle movement, but there are specific circumstances where it is inappropriate to engage them. When brakes are very hot, typically due to continuous or excessive use, applying the parking brake can lead to potential damage. The heat can cause the brake components to warp or even result in brake fade when they cool down, which can compromise the effectiveness of the parking brake mechanism. In this scenario, allowing the brakes to cool before engaging them can help maintain their integrity. Other circumstances, such as parking on level ground, leaving the vehicle unattended, and stopping the vehicle, are generally appropriate times to apply the parking brake. In fact, using the parking brake under these conditions helps ensure stability and safety. In summary, the correct answer identifies a scenario that could lead to brake damage, highlighting the need for proper brake management practices.