How should you test the parking brake?

Testing the parking brake by setting it and then pulling against it in a low gear is a proper method because it allows you to assess the effectiveness and strength of the parking brake under load. When the vehicle is in a low gear and the parking brake is engaged, you can determine whether the brake holds the vehicle securely. This simulates a realistic scenario where the parking brake needs to keep the vehicle stationary on an incline or when it's parked. If the vehicle moves when you pull against the brake, it indicates that the parking brake may need adjustment or maintenance.

Using this testing method also ensures safety since it helps to confirm that the parking brake is functioning correctly before relying on it while parked. It's a practical test that helps drivers ensure their vehicle is secure when left unattended.

The other options do not represent effective methods for testing the parking brake. For instance, pulling the parking brake while stationary does not evaluate the brake's holding capacity under load. Releasing the brake at high speed is dangerous and contradicts safe driving practices. Pushing down hard on the brake pedal primarily tests the hydraulic brake system rather than the parking brake functionality.