What Causes the Squeaking Sound When Braking?
2 Answers
The reasons for the squeaking sound when braking are: 1. Severe wear of the brake disc; 2. Hard foreign objects entering between the brake pad and brake disc; 3. Brake pad warning—if the wear of the brake pad reaches the warning line, it will emit an alarm sound; 4. Use of low-quality or overly hard brake pads; 5. Abnormal noise from the return spring of the brake light switch on the brake pedal. Braking, also known as stopping, refers to the action of stopping or reducing the speed of moving locomotives, vehicles, other transport tools, or machinery. The general principle of braking is to fix a wheel or disc on the high-speed shaft of the machine and install corresponding brake shoes, bands, or discs on the machine base, which generate braking torque under external force.
Hey, I often help friends check their cars. The most common cause of squeaky brakes is either worn-out brake pads or dust contamination. New brake pads sometimes squeak for a few days—that's just the break-in period, and it'll go away after some driving. Alternatively, if the brake rotors aren't smooth due to rust or scratches, they can cause screeching when friction occurs. It's more noticeable on rainy days because moisture temporarily makes the system noisy, but it should return to normal once dry. If the noise persists, it might be due to lack of lubrication in the brake caliper pins, causing them to stick. I recommend first checking the brake pad thickness yourself—if they're too thin, it's time for a replacement. Regular maintenance can prevent these issues, so don't ignore squeaky brakes; they might affect braking performance. If the problem continues, have a professional technician inspect it immediately to avoid potential hazards.
