What Causes the Abnormal Noise When Releasing the Brake on a New Car?

[LeElle]

This abnormal noise is mainly caused by releasing the brake too slowly when starting or by the brake disc and brake pads sticking together due to rust. Below are the replacement standards for brake pads: Mileage: Under normal driving conditions, the front brake pads should be replaced approximately every 30,000 to 50,000 kilometers, and the rear brake pads every 60,000 to 100,000 kilometers. Once severe wear is noticed, they should be replaced promptly. Wear Level: Generally, new brake pads are about 1.5 centimeters thick. If they wear down to one-third of their original thickness, or less than 5 millimeters, it is advisable to replace them promptly. If a metallic grinding noise is heard when braking, it may indicate that the brake pads have worn down to their minimum thickness, causing the limit indicators on both sides to rub against the brake disc and produce abnormal noise—immediate replacement is necessary. If the brake pedal feels lighter than usual, or if braking becomes difficult or ineffective, it indicates severe wear and insufficient thickness of the brake pads, requiring prompt replacement.