Why is there a sound when braking suddenly?

[OwenRose]

It may be related to brake pad wear. Methods to resolve the issue: If it's metal-on-metal contact, the discs and pads should be replaced immediately. Additionally, if the brake warning light on the dashboard is not activated, the sensor connected to the brake warning light should also be checked for any issues. When a screeching sound occurs while braking, aside from the initial bedding-in period of new pads, the first step should be to inspect the brake pads to see if they are worn out or if there is any foreign material present. If the brake pads are worn out, they should be replaced immediately. If foreign material is found, the brake pads should be removed, the foreign material extracted, and then reinstalled. When a hissing sound occurs while braking, it is recommended to first check if there are any issues with the friction between the caliper, brake disc, and brake pads. Brake pads are consumable items: They become thinner with vehicle use. When the friction layer is nearly depleted, there is a warning mechanism at the edge of the brake pad—the brake pad wear indicator (a metal tab). At this point, the metal tab will rub against the brake disc, producing a sharp metallic friction sound as a warning to remind the driver to replace the brake pads.