What Causes the Abnormal Noise When Pressing the Car Brakes?
2 Answers
Here are the specific reasons for the abnormal noise when pressing the car brakes: Improper installation of brake pads: When installing new brake pads, the old brake disc was not polished, resulting in a poor fit. Improper installation or fitting new pads without polishing the old disc causes the new pads to directly rub against the uneven surface of the old disc, eventually leading to uneven wear of the new brake pads. Brake system malfunction: There may be defects in the brake system itself, causing the brake pads to only partially contact the brake disc. This increases the pressure per unit area on the brakes, resulting in abnormal noise. It is recommended to check components such as the caliper and guide pins. Presence of foreign objects: Foreign objects cause a poor contact surface, leading to abnormal noise.
I've been driving for over a decade and have encountered brake noise issues several times. The most common cause is when brake pads are nearly worn out, causing the metal wear indicator to scrape against the rotor, producing a sharp squealing sound. Once while driving, I heard squeaking and when I got to the shop, the pads were paper-thin. Another reason is rust on brake rotors, especially after parking in humid weather - the rust rubbing against pads creates strange noises. The solution is simple: first check pad thickness (replace immediately if under 3mm); if it's just rust, a few firm brake applications to heat them up usually solves it. Also, small stones or debris in the braking system can cause noise - remember to clean it out. Don't ignore these issues, or you'll damage rotors and face costly repairs.
