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What Causes the Abnormal Noise When Braking a Car?

2 Answers

EliasRose

07/25/25 3:53pm

Abnormal noise when braking a car is mainly caused by the following reasons: 1. New brake pads are in the run-in period. 2. Metal particles appear on the brake pads. 3. Excessive wear of the brake disc and brake pads. 4. Deformation of the brake disc. Below is an introduction to car brake pads: 1. Brake pads, also known as brake linings, are the most critical safety components in a car's braking system. They are important braking components that ensure the safety of the driver. 2. Brake pads are generally composed of steel plates, adhesive heat insulation layers, and friction blocks. The heat insulation layer is made of non-heat-conducting materials to provide thermal insulation. The friction block is composed of friction materials and adhesives. When braking, it is pressed against the brake disc or brake drum to generate friction, thereby achieving the purpose of slowing down and stopping the vehicle.

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DeMadelyn

08/11/25 9:37pm

I remember last week when I stepped on the brakes while driving, I heard a sharp squeaking sound, which was really scary. Later, I took it to the auto repair shop for inspection, and the experienced mechanic said it was a sign of excessive brake pad wear—the metal part was rubbing against the brake disc, making an unpleasant noise like nails on a chalkboard. Additionally, if it's a new car or the pads were recently replaced, there might be minor noises during the initial break-in period, but they should fade with use. Also, if there's rust or debris stuck on the brake disc surface, it can easily cause unusual sounds after a few presses. I suggest not ignoring it because it affects braking performance—if the brakes fail at a critical moment, it could be dangerous. Regular maintenance is crucial; I personally have the brake pad thickness checked every six months to ensure safety. After parking, I usually wipe the brake area lightly with a soft cloth to prevent dust buildup. If the noise persists or worsens, professional inspection is a must to avoid chain damage to other components.

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How to Confirm a Successful Subject 1 Exam Appointment?

Generally, you will receive a text message notification after making an appointment, or you can check the appointment result on the traffic management platform. Relevant details are as follows: 1. Exam Content: Subject 1, also known as the theoretical exam for drivers, is part of the assessment for obtaining a motor vehicle driver's license. According to the "Regulations on the Application and Use of Motor Vehicle Driver's Licenses," the exam covers theoretical driving basics, road safety laws and regulations, local regulations, and related knowledge. The exam is computer-based, consisting of 100 questions, with a passing score of 90 or above. 2. Exam Location: Subject 1 refers to the theoretical exam for drivers, conducted at the vehicle management office, which is a mandatory licensing exam for all driver's license applicants. The exam includes the most fundamental knowledge such as theoretical driving basics, road safety laws and regulations, traffic signals, traffic rules, plus local regulations. The scheduling of the theoretical exam is arranged by local vehicle management offices.

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