What causes the buzzing sound from the right rear wheel after turning off the engine?
2 Answers
This is a normal phenomenon. It is the sound of the exhaust pipe contracting, and the noise will disappear after a few minutes. Models equipped with electronic parking brakes may also experience this situation, which is the sound of the electronic parking brake motor and is also normal. Below are specific details about electronic parking brakes: 1. Principle: The working principle of electronic parking brakes is similar to that of mechanical handbrakes. Both essentially create friction between the brake disc and brake pads to achieve parking brake purposes, except that the traditional mechanical handbrake lever has been replaced by an electronic button. 2. Function: The parking brake is achieved through electronic control. Additionally, it extends to the vehicle's auto-hold function, allowing the driver to avoid prolonged braking when parking, effectively preventing the vehicle from rolling.
I’ve experienced the buzzing sound from the right rear wheel after turning off the engine a few times myself. At first, I was quite panicked, thinking there was a major issue with the car. Later, after consulting a mechanic friend, I learned that many modern vehicles have electronic systems that continue running for a while after shutdown—like the electronic parking brake resetting or the cooling fan delaying its shutoff. This is especially common in hybrid or electric-driven rear-wheel units. If the sound disappears quickly and there are no other issues, it’s likely just a normal self-check process. However, if the buzzing lasts more than ten seconds or is accompanied by vehicle shaking, it’s best to get it checked by a professional immediately to avoid minor issues turning into major ones. By the way, this is more common during high summer temperatures or after rain or snow, when the system is under more pressure. Asking your mechanic about it during maintenance can help prevent potential problems. In short, driving requires careful observation—don’t ignore issues when they arise.
