What Causes the Buzzing Sound in the Engine Compartment When Braking?

[CamillaMarie]

The following are three reasons for abnormal noise when braking: Issues with the vehicle's brake fluid: The brake fluid is either insufficient or has reached its replacement cycle. Loose brake fluid lines may cause leakage, resulting in abnormal noise from the engine compartment when braking. This situation requires professional repair at a specialized shop. Sand in the brake discs: Generally, newly purchased vehicles do not produce abnormal noise when braking. If the car hasn't been driven many kilometers and the brakes start making noise, it's likely due to particles like sand or iron powder getting into the brakes. In such cases, pressing the brakes will produce a sharp sound. This issue can often be resolved by using a high-pressure water gun during car washing. If that doesn't work, disassembly and cleaning may be necessary. Overly hard brake pads: Some newly purchased vehicles produce noise when braking, especially when braking lightly. This is usually because the brake pad material is relatively hard. The noise typically disappears when braking harder. Generally, this situation can be ignored and allowed to wear in over time.