What Causes the Buzzing Sound and Resonance Sensation When Braking a Car?
2 Answers
The reasons for resonance sensation and noise when braking a car are as follows: 1. Tensioner pulley wear: The tensioner pulley's function is to keep the engine belt tight, preventing the generator and power steering pump from slipping. Due to prolonged pressure and high-speed rotation, the bearings inside the tensioner pulley are prone to wear, resulting in noise and resonance. When it's confirmed that the tensioner pulley is causing the buzzing sound and resonance, it's also necessary to check the engine mounts, as their role is to reduce vibrations and noise generated by the engine. 2. Exhaust pipe deformation: In most front-engine vehicles, the exhaust pipe extends from the bottom of the car to the rear. Driving on rough roads or impacts to the undercarriage can easily cause the exhaust pipe to dent or deform. A deformed exhaust pipe increases exhaust resistance, leading to buzzing sounds and resonance sensations from the exhaust system.
I'm an experienced driver who has been on the road for many years and have encountered quite a few issues with brake humming. Usually, this is due to problems with the brake discs, such as uneven surfaces or rust, which cause vibrations when the brake pads rub against them, leading to humming sounds and resonance. It could also be because the brake discs have warped due to heat or were improperly installed. I often felt this when driving on dirt roads, and later discovered it was caused by accumulated grime on the discs. When the humming is loud, braking performance is also affected, such as uneven braking force, especially noticeable during turns. I recommend first checking if the brake disc surface is smooth. If there are bumps, you can lightly sand them with sandpaper, but it's best not to do it yourself as it can easily lead to issues. Also, check the wear level of the brake pads, as excessive wear can also cause noise. Regular maintenance is crucial—inspect the braking system every 10,000 to 20,000 kilometers, and if any issues arise, take it to a professional repair shop immediately. Safety comes first; don't delay, as worsening humming could lead to brake failure, which is especially dangerous at high speeds.
