Do I still need to engage the electronic handbrake when in P gear?
3 Answers
Yes, it is necessary. The electronic handbrake is a technology that achieves parking braking through electronic control. For prolonged parking, the handbrake must be engaged; otherwise, it may damage the locking mechanism of the automatic transmission. Here is some relevant information about the electronic handbrake: 1. Principle: The electronic handbrake is a technology that achieves parking braking through electronic control. Its working principle is the same as that of a mechanical handbrake, both relying on the friction generated between the brake disc and brake pads to control parking braking. The only difference is that the control method has changed from the previous mechanical handbrake lever to an electronic button. 2. Function: The electronic handbrake has evolved from the basic parking function to include the automatic parking function AUTO-HOLD. The application of AUTO-HOLD automatic parking technology eliminates the need for drivers to maintain prolonged braking when the vehicle is stationary. When the automatic electronic parking brake is activated, it can prevent unnecessary sliding of the vehicle.
I always make it a habit to engage the electronic parking brake every time I park, even if I've already shifted into P. The P gear locks the gears with a metal hook inside the transmission, which is fine for short-term parking, but relying solely on it on slopes is risky. The electronic parking brake directly locks the rear wheels, providing double insurance for peace of mind. I remember once in an underground garage, I only shifted into P without engaging the handbrake, and when I came back, the car had rolled forward over half a meter—luckily, it didn’t hit the wall. Now, it’s muscle memory: after coming to a stop, I shift into N, engage the electronic parking brake, release the foot brake to let the car stabilize, and then shift into P before turning off the engine. This protects the transmission’s locking mechanism. A mechanic told me that cars that frequently skip the handbrake may develop gear-shifting jerks in about three years. After all, pressing an electronic button is much cheaper than replacing a transmission.
From a mechanical perspective, the P gear and electronic parking brake are completely two separate systems. Engaging P gear means the transmission gear is locked by a pawl, but the pawl is only as thick as a fingernail. If it bears the full weight of the vehicle on a slope for a long time, it can deform. The electronic parking brake, on the other hand, uses a motor to drive the brake pads to clamp the rear wheels, providing more even and reliable braking force. My experience is that you can skip it on flat roads, but in shopping mall basements or mountain roads, you must engage it. Recently, a car wash attendant showed me a video where a car parked only in P gear was blown out of place by strong winds. Manufacturers designed these two functions to serve as backups for each other, just like adding a security chain to your home door lock. Additionally, many car manuals explicitly recommend using both simultaneously, especially during the rainy season when the ground is slippery—extra caution is needed.
