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What Causes Noise When Braking?

1 Answers
Jocelyn
07/25/25 1:25am
Possible situations when there is noise during braking include: 1. When starting a cold car, there is a screeching sound when braking. This often occurs in the morning, especially in winter mornings, when there is moisture on the brake discs. The sound is particularly noticeable when starting to drive, but it disappears after driving for a while as the moisture evaporates. In this case, there is no need to worry about any brake issues. 2. A "clanging" sound when braking. This may be caused by small stones getting into the hollow part of the brake disc, resulting in a regular knocking sound when the vehicle is moving. Simply remove the tire and take out the small stones or foreign objects. 3. A metal-on-metal grinding sound when braking. This is mainly due to the brake pads wearing down to the safety line, a problem that many drivers easily overlook. Initially, the sound is very small, but as it gradually becomes louder, the brake pads will wear out completely, and eventually, the braking effect will rely solely on the metal of the brake pads and the brake disc. At this point, the brake pads and brake disc need to be replaced. 4. A "clicking" sound when braking. In most cases, this is caused by the driver slamming on the brakes at high speed, triggering the vehicle's ABS function to prevent accidents caused by locking the brakes. 5. A "pop" sound when starting the vehicle after releasing the handbrake. This is mainly because the brake disc is made of cast iron, and the brake pads also contain iron components. When the brake disc rusts, it may stick to the brake pads. In this case, simply pressing the accelerator slightly and then releasing it will resolve the issue, and there is no need to worry about any brake problems. 6. A sound when lightly braking with newly replaced brake pads. There are two main reasons for this. One is severe wear on the brake disc, causing the brake pads and brake disc to not fully contact, resulting in uneven wear and noise. The other is that the selected brake pads are not the silent type. In this case, simply choosing ceramic-type brake pads will solve the problem.
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How Many Points Can Be Deducted Through Traffic Law Learning for a Driver's License?

The maximum points that can be deducted through traffic law learning for a driver's license in one scoring cycle is 6 points. According to Article 5 of the "Notice on the Work Standards for Reducing Road Traffic Violation Points Through Accepting Traffic Safety Education (Trial)" issued by the Ministry of Public Security on January 14, 2020 (Public Transport Management [2020] No. 14): Motor vehicle drivers who apply to participate in traffic safety education to reduce traffic violation points must participate in corresponding road traffic safety laws, regulations, and related knowledge learning, examinations, or traffic safety public activities according to their highest permitted driving vehicle type and meet the relevant requirements to apply for the reduction of traffic violation points. The point reduction through learning is a measure for drivers holding a driver's license who have been penalized with points due to traffic violations. After participating in online traffic safety learning and passing the examination, their points can be reduced. This is a convenient traffic management measure uniformly deployed by the Traffic Management Bureau of the Ministry of Public Security. Specific precautions are as follows: Applicable groups: Motor vehicle drivers who hold a driver's license of the People's Republic of China, regardless of the permitted driving vehicle type or whether they are commercial vehicle drivers, can participate in point reduction through learning. They must participate in corresponding road traffic safety laws, regulations, and related knowledge learning and examinations according to their highest permitted driving vehicle type. Specific rules: Motor vehicle drivers participating in online road traffic laws, regulations, and related content learning must study continuously for 5 minutes each time. The cumulative study time must reach 30 minutes within 3 days, and then they must register for an examination within 7 days. Passing the examination can reduce 1 point. Drivers can also attend on-site learning, with each session lasting no less than 1 hour. After completing the required study hours, they can apply for an examination. Passing the examination can reduce 2 points. Drivers can also participate in offline safety public activities, with each session lasting one hour, and each session can reduce 1 point. Within 3 days, the cumulative study time must reach 30 minutes, with each study session lasting no less than 5 minutes. Passing the examination can reduce 1 point at a time. Cases not accepted: Under any of the following circumstances, the application will not be accepted: In the previous scoring cycle, the driver had two or more full-point records. Within a 3-point cycle, the driver was involved in hit-and-run accidents, drunk driving, or the use of forged or altered documents or license plates. The driver's license is in the probation period or has not been reviewed as required. The driver has unprocessed traffic violation records under their name. The driver has a motor vehicle under their name with an expired safety technical inspection or not deregistered as required. The driver has already reduced the maximum 6 points in the current cycle.
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What is the Replacement Interval for an Air Filter?

According to the vehicle's maintenance manual, the air filter should generally be replaced every 20,000 to 60,000 kilometers. If the driving distance is relatively low, it is recommended to replace it every 12 months. The location of the air filter in a car depends on the intake form and the structure of the engine. There are two types of air filters in cars: dry and wet. Dry filters are made of paper or organic materials, while wet filters are made of metal mesh. The function of the air filter: It filters out particulate impurities in the air, ensuring that a sufficient amount of clean air enters the cylinders. It prevents floating dust in the air from being sucked into the engine, which could accelerate the wear of the piston group and cylinders. Air filter: It is a type of filter, also known as an air filter cartridge, air cleaner, or element. It is mainly used in engineering vehicles, cars, agricultural vehicles, laboratories, sterile operating rooms, and various precision operating rooms as an air filter. During operation, the engine inhales a large amount of air. If the air is not filtered, the suspended dust in the air will be drawn into the cylinders, accelerating the wear of the piston group and cylinders. Larger particles entering between the piston and cylinder can cause severe cylinder scoring, especially in dry and sandy working environments. The air cleaner is installed in front of the carburetor or intake pipe to filter out dust and sand particles from the air, ensuring that a sufficient amount of clean air enters the cylinders. Dirty air cleaner: Using an excessively dirty air filter while driving can cause insufficient air intake into the engine, leading to incomplete fuel combustion. This results in unstable engine operation, reduced power, and increased fuel consumption. Therefore, it is essential to keep the air cleaner clean. The car air cleaner is a device that removes particulate impurities from the air, consisting of one or several air filter components. Its main function is to filter out harmful impurities from the air entering the cylinders to reduce early wear of the cylinders, pistons, piston rings, valves, and valve seats. Therefore, before air enters the cylinders, it must pass through the fine filtration of the air cleaner. A dirty air cleaner can cause poor engine performance, excessive fuel consumption, and engine damage. When inspecting the air cleaner, if it is found to be lightly clogged with minimal dust, it can be cleaned by blowing compressed air from the inside out and reused. Excessively dirty air filters should be replaced promptly.
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What maintenance should be done for an 80,000 km car?

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