Air Brake Practice Test

Engaging the parking brake anytime the vehicle is stationary is a fundamental safety practice. It acts as a safeguard to prevent the vehicle from rolling, especially on inclines or uneven surfaces. The parking brake is designed to hold the vehicle in place when it is not in motion, providing an added layer of safety beyond the regular service brakes.

Choosing to engage the parking brake when parked on a flat surface, while not incorrect, does not fully utilize the purpose of the parking brake in ensuring that regardless of the conditions or topography, the vehicle remains securely stationary. Parking the vehicle while the engine is running does not automatically deem the parking brake unnecessary, as there can still be situations where the vehicle could unintentionally roll. When driving downhill, engaging the parking brake is not advisable due to the potential strain it could put on the brake system and the risk of losing control.

Therefore, the optimal practice is to engage the parking brake anytime the vehicle is stationary, regardless of the surface, incline, or whether the engine is on, ensuring maximum safety according to best practices in vehicle operation.