What Are the Causes of Disc Brake Noise?
2 Answers
Disc brake noise can be attributed to the following reasons: Severe wear of front and rear brake pads: When the brake pads wear down to a certain extent, they will produce abnormal noises during braking. Improper installation leading to uneven brake pads: Some users prefer to replace the brake pads themselves after wear, but improper installation can cause unevenness in the brake pads, resulting in abnormal sounds during sudden braking. Low precision of front disc brakes causing friction with the disc: Some small electric vehicle manufacturers opt for lower-cost disc brakes to save costs, which often have lower precision. When braking, these brakes may rub against the disc, producing abnormal noises.
With twenty years of experience in car repairs, the most common cause of squealing disc brakes is brake pads contaminated with dust, small stones, or metal shavings. When driving, the wheels can pick up debris that gets stuck in the brake gaps, causing a squeak when you press the pedal. Another major cause is uneven brake rotor surfaces due to irregular wear, leading to inconsistent friction. Additionally, loose caliper bolts or stiff piston retraction can also create noise. Lack of lubrication on the brake pad backing plate can cause poor movement as well. I recommend car owners regularly clean their wheels and brake systems, avoiding parking immediately after driving through muddy areas. Don’t ignore these sounds—they may indicate declining braking performance, which becomes especially dangerous during high-speed emergencies. It’s best to have a mechanic inspect rotor wear and pad thickness every 10,000 km. Timely resurfacing or replacement can save significant costs. Safe driving relies on meticulous maintenance—ignoring small issues can lead to bigger problems later.
