What Causes the Squeaking Noise from Car Brake Discs?

[SanLuke]

Car brake disc squeaking noise can be caused by: 1. Human factors, such as noise occurring after removing the original brake pads and installing new ones. When replacing brake pads, it is necessary to first check whether the brake disc has scratches. If there are scratches, it is recommended to smooth them out or replace the disc; 2. The brake disc surface is smooth but noise occurs after installing new pads, which may be due to the mechanic installing the brake pads incorrectly. Upon removal, it can be seen that only part of the brake pad surface has friction marks, and they can be reinstalled; 3. Product factors, such as inconsistent friction block sizes among domestic manufacturers for the same model of brake pads, especially the width of the friction blocks. If larger-sized brake pads are installed on brake discs that have been used with smaller-sized brake pads, noise will also occur. The disc can be smoothed first, or if not smoothed, driving for a period of time until the marks match will stop the noise.