Why is there a sound when stepping on the brake in P gear?
2 Answers
It is normal to hear a sound when stepping on the brake in P gear. The sound is produced by the electromagnetic switch engaging when the brake is pressed. After starting the vehicle, to prevent accidental gear shifting that could lead to traffic accidents, an electromagnetic switch is installed on the brake pedal. Only when the brake is pressed will the locking device disengage, allowing gear shifting. Shifting from P gear to any other gear requires stepping on the brake to avoid accidents. Manufacturers have designed an unlock button that prevents shifting from P gear to another gear without pressing the brake. For automatic transmissions, not all gear shifts require stepping on the brake. Only when shifting from P gear to another gear is stepping on the brake mandatory. Not stepping on the brake can easily damage the parking gear, while switching between other gears does not require stepping on the brake.
I've also experienced noise when pressing the brake in P gear while driving. This is mostly normal, so don't worry too much. Specifically, when you park in P gear, pressing the brake may trigger the release of the transmission's locking mechanism, producing a clicking or slight friction sound. This is called gear lock release, designed to prevent accidental gear shifting. My car makes more noticeable brake noises during cold starts or after prolonged parking. However, if the sound becomes louder or irregular, such as metal scraping or high-pitched squealing, then you should pay attention: the brake pads may be excessively worn and need replacement, or the brake discs might be warped, or the calipers loose, which could affect braking performance over time. I recommend having a technician check it during your next maintenance service—safety comes first. Usually, you can monitor the frequency and volume of the noise yourself; if anything seems abnormal, address it early.
