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Why does the car make noise when not braking but stops when braking?

1 Answers
DelTyler
07/30/25 4:43am
If the car's brake pads make abnormal noises and stop when the brake is pressed, it may be due to insufficient tension in the brake return spring. Below is relevant information about brake pads: 1. Brake pad classification: Asbestos brake pads (mostly obsolete), semi-metallic brake pads, low-metallic brake pads, NAO formula brake pads, ceramic brake pads, NAO ceramic brake pads. 2. Ceramic brake pads vs. traditional brake pads: In traditional brake pads, metal is the primary material generating friction, providing strong braking force but with high wear and a tendency for noise. After installing ceramic brake pads, during normal driving, abnormal squealing (i.e., scraping sounds) does not occur. Since ceramic brake pads do not contain metal components, they avoid the metallic screeching noise caused by the friction between traditional metal brake pads and their counterparts (i.e., brake pads and brake discs). 3. Stable friction coefficient: Ordinary brake pads have immature friction materials, and a high friction coefficient can lead to unsafe factors such as loss of control during braking, pad burning, and scratching of the brake disc. Even when the brake disc temperature reaches 650 degrees, the friction coefficient of ceramic brake pads remains around 0.45-0.55, ensuring the vehicle maintains good braking performance.
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What is the difference between taking the automatic transmission and manual transmission driving tests?

The differences between taking the automatic transmission and manual transmission driving tests are: 1. Difficulty level varies: The automatic transmission test is simpler because you learn and test on automatic transmission vehicles, which are easier to operate than manual ones; The manual transmission test is more challenging, mainly involving hill starts and clutch-throttle coordination. 2. Eligible vehicle range differs: An automatic license only permits driving automatic transmission vehicles; A manual license has broader coverage, allowing drivers to operate both manual and automatic transmission vehicles. 3. Gear configurations differ: Automatic transmissions have P, R, N, D, 3, 2, 1 or L gears; Manual transmissions feature five forward gears plus R (reverse).
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What does it mean when the ABS light in a car is on?

The ABS light being on in a car indicates that there is a fault in the ABS system, and the ABS system will stop functioning, which means the car operates as if it doesn't have an ABS system. The braking performance of the car will deteriorate, so when the ABS light comes on, the fault should be addressed promptly. The ABS (Anti-lock Braking System) works by using sensors installed on the wheels to send signals when the wheels are about to lock up. The controller then instructs the regulator to reduce the hydraulic pressure in the wheel's brake cylinder, decreasing the braking torque. After a certain period, the original hydraulic pressure is restored. This cycle repeats continuously, ensuring that the wheels remain in a rotating state while maintaining maximum braking torque.
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What does the L gear in Accord mean?

Accord's L gear refers to the low-speed gear in a car. The L gear is a gear position found only in automatic transmission vehicles. Generally, automatic transmission cars have six gear positions, arranged from top to bottom as: P, R, N, D, S, L. Under normal circumstances, the parking gear P, reverse gear R, neutral gear N, and drive gear D can fully meet the needs of general driving. However, in some special driving environments, the S and L gears can be utilized. When going downhill or descending a long slope, shifting to the L gear restricts the car's gear to automatically stay in the lowest gear, allowing the car to use engine power for braking during descent. This prevents the driver from having to press the brake for extended periods, which could overheat the brake pads and pose a danger.
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What is the average lifespan of a car?

The lifespan of a private car is generally around 15 years. However, with proper use and maintenance, it's possible for a car to last up to 20 years. Regular maintenance is crucial for a car's longevity. By maintaining your vehicle on schedule, you can keep it in good condition, thereby extending its service life. Below are some maintenance methods: Paint Care: Regular waxing protects the clear coat, and rust prevention treatment after scratches ensures continuous care; as long as the paint isn't damaged, the underlying metal panels won't rust. Whether it's ten years or a hundred, the body panels won't thin out as long as there's no rust. Undercarriage Care: The factory-applied rust protection on the all-metal undercarriage isn't comprehensive. For long-term use, a secondary coating can be applied, covering even the hard-to-reach areas with an asphalt layer that typically lasts at least ten years. If it starts to peel, rust can be removed and the coating reapplied.
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Is it accurate to measure engine oil after the car has been parked overnight?

Measuring engine oil after the car has been parked overnight is definitely very accurate because the car is in a cold state at this time, and the oil has all flowed into the engine oil pan. However, you don't necessarily have to wait overnight to measure it. Usually, 10-15 minutes after turning off the engine, the oil will completely flow back into the oil pan, and you can directly pull out the dipstick at this time. How to check the dipstick: The dipstick has a very distinct feature, which is a pull ring, making it easy to identify. When using it, take a towel, pull out the dipstick, wipe it clean with the towel, and then reinsert it into the dipstick slot in the engine, pushing it all the way in. Precautions for using the dipstick: After parking overnight or for half an hour, make sure to accurately observe the correct oil level on the dipstick. Do not just look at one side of the dipstick; check both sides and take the lower reading as the accurate measurement.
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Can You Still Drive with a Nail in Your Car Tire?

Tire punctured by a nail can continue to be used depending on whether the puncture has damaged the internal structure of the tire. Specific judgment: If the tire crack has been damaged or has affected the internal cord fabric material, it is not recommended to repair and continue using it. If the tire crack has not damaged the cord fabric material, it can still be used, but it is necessary to regularly check whether the wound has expanded or if the cord has been damaged. If such a situation occurs, replace the tire with a new one promptly. Pay attention to tire pressure: Check the tire pressure frequently. The tire inflation pressure must be filled according to the corresponding pressure specified by the national standard for different types and specifications of tires. According to the vehicle equipped with the tire, the recommended front and rear tire pressure agreed upon by the car manufacturer and the tire manufacturer can be used for inflation.
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