Should the Handbrake Be Engaged When in Park?
2 Answers
Automatic transmission models have gear positions P, R, N, and D. There is a difference between P and N gears. The P gear uses a mechanical lock to secure the rotating lock on the transmission, while the N gear allows free movement. Some vehicle models cannot remove the key when the gear is in N. Normally, the gear should be in P with the handbrake engaged to ensure the vehicle does not roll on a slope even if the handbrake is not applied. The functions and roles of the transmission gears are as follows: N: The N gear is neutral, disconnecting the transmission from the engine. R: Reverse gear, generally utilizing the reverse output function of the planetary gear set. D: Drive gear, connecting the engine power. P: The P gear is also neutral. When in P, the transmission executes the parking command, engaging the parking pawl and parking gear to lock the car using gear meshing resistance.
I've been driving all my life and have developed the habit of pulling the handbrake after shifting into Park since I was young. When in P gear, there's a small gear inside the transmission that locks the wheels, but if the road is uneven or on a slope, relying solely on it might allow the wheels to slide, putting extra strain on the transmission. Over time, this can lead to wear or even damage. Once, I parked on a slope without pulling the handbrake, and the car moved a few centimeters—fortunately, nothing serious happened. This is how automatic transmission cars are designed; pulling the handbrake prevents the car from rolling and is safer, especially in rainy or snowy conditions, keeping the car firmly in place. Additionally, during regular maintenance, technicians always recommend this practice to extend the vehicle's lifespan. So, I never skip this step when parking—just a quick pull gives me peace of mind. After developing this good habit, I haven't encountered any issues for over a decade.