Why Does the Car Brake Make a Squealing Sound?
2 Answers
The reasons for a car brake making a squealing sound are: 1. Excessive wear of the brake disc and brake pads; 2. Abnormal assembly of the brake pads; 3. Presence of foreign objects on the brake pads or brake disc; 4. Poor retraction of the caliper can cause prolonged friction between the disc and pads. Braking, also known as deceleration, refers to the action of stopping or reducing the speed of moving locomotives, vehicles, other means of transport, or machinery. The maintenance methods for brakes are: 1. Regularly check the thickness and wear of the brake pads, and whether they retract freely; 2. Replace them promptly when wear reaches the limit to avoid reducing braking efficiency and compromising driving safety; 3. Use original manufacturer-provided brake pads for replacement; 4. Use specialized tools to retract the brake caliper during replacement; 5. After replacement, press the brake pedal several times to eliminate the gap between the shoes and the brake disc.
When I hear a squealing sound while braking, it immediately makes me nervous because it could indicate a safety hazard. The main reason is that the brake pads have worn too thin, and the metal indicator inside starts scraping against the brake disc, producing a warning noise. If left unaddressed, the brake disc could also get damaged, leading to costly repairs. Another possibility is that water or rust on the brake disc after rain causes temporary squealing, which usually goes away after a few brake applications. However, if the noise persists, don’t delay—the braking system affects emergency stopping distance, and a small issue can escalate into a crisis. I recommend checking the brake pad thickness first—replace them if less than 3mm remains—and then visit a professional shop as soon as possible. I never joke about this; safety should always come first. Maintain regular inspections, check your brakes every six months, and remember—prevention is better than regret.
