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What are the causes of brake noise at low speeds?

1 Answers
VanElliana
07/29/25 3:19pm
Causes of brake noise at low speeds: 1. Running-in of a new car, where the brake pads' running-in is an important part. Usually, after driving a few hundred kilometers, the brakes will feel more comfortable; 2. Brake noise may occur after the car has driven through water, mainly due to wear caused by the lack of lubrication from driving through puddles on rainy days, or possibly due to rust from water exposure; 3. Very fine sand particles may get between the pads and discs while driving, sometimes causing noise due to friction. In most cases, this does not require repair; 4. Excessive wear of the brake discs or brake drums, which may become too thin and cause noise; 5. Missing or damaged fixing screws of the brake discs can also cause brake noise; 6. Malfunction of the brake system, which requires inspection and repair.
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Why Does the Car Sound Get Louder?

Here are the main reasons why a car's sound gets louder: 1. Too much engine oil: This increases the instantaneous working resistance of the engine, thereby increasing the rotational resistance of the crankshaft and reducing the engine's output power. Additionally, excess oil can enter the combustion chamber and participate in combustion, leading to oil burning, blue smoke emission, increased fuel consumption, and a louder car sound. 2. Incorrect oil type: If you previously used fully synthetic oil and now switch to mineral oil, it can cause the car sound to become louder and the engine to behave abnormally. Counterfeit or inferior quality oil can cause significant damage to the engine. It is essential to strictly follow the oil type recommended in the maintenance manual when adding oil.
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What does 'hold' mean in a car?

The 'hold' in a car refers to the automatic parking function. The working principle and usage method of automatic parking are as follows: Working principle of automatic parking: The automatic parking function provides accurate parking force through a slope sensor controlled by the controller. During startup, the parking control unit calculates information provided by sensors such as clutch distance, clutch engagement speed, and throttle pedal. When the driving force exceeds the driving resistance, the parking brake is automatically released, allowing the car to start smoothly. Usage method of automatic parking: When the driver has fastened the seat belt, the driver's side door is closed, and the engine is running, pressing the automatic parking switch activates the function from off to standby mode. When the brake pedal is depressed to a certain depth and the vehicle has come to a complete stop, the automatic parking function switches from standby to parking mode. While in parking mode, selecting the appropriate forward or reverse gear and pressing the accelerator pedal will cause the automatic parking to release automatically based on the slope gradient.
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Where is the windshield washer nozzle located?

The windshield washer nozzle of a car is located under the hood, inside the engine compartment near the bottom of the windshield. The specific steps to locate it are as follows: 1. Open the driver's door of the car. 2. Pull the hood release lever located on the left side of the driver's leg area. 3. Lift the car's engine hood upward. 4. Secure the engine hood with the support rod to ensure it is firmly held in place and to prevent any hazards during operation. 5. The windshield washer nozzle is situated under the hood, inside the engine compartment near the bottom of the windshield.
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Do Plug-in Hybrid Vehicles Need to Be Charged?

Plug-in hybrid vehicles do require charging. Here are the specific details: 1. In simple terms, a plug-in hybrid electric vehicle (PHEV) is a type of vehicle that falls between a pure electric vehicle and a traditional fuel-powered vehicle. It is equipped with both the internal combustion engine, transmission, drivetrain, fuel system, and fuel tank of a conventional fuel-powered car, as well as the battery, electric motor, and control circuitry of an electric vehicle. Moreover, its battery capacity is sufficient to support driving in pure electric mode for a certain distance and includes a charging port. 2. In principle, plug-in hybrid vehicles can operate without being charged because when the battery is depleted, the engine can drive a generator to produce electricity. This electricity is then directly delivered to the electric motor via the motor controller, which in turn drives the vehicle. The power battery can also be charged externally. If the battery pack becomes ineffective or unusable, the engine alone can drive the electric motor to power the vehicle. Additionally, the power battery can be charged while the vehicle is parked. 3. However, due to the presence of the battery, plug-in hybrid vehicles are significantly heavier than traditional gasoline-powered vehicles. When the battery is depleted, the fuel consumption over the same distance is higher compared to conventional gasoline cars. Therefore, it is recommended to charge the vehicle promptly to achieve fuel-saving purposes. 4. Under normal circumstances, a typical plug-in hybrid vehicle needs to be charged every 2 to 3 days, with the charging schedule arranged according to individual usage scenarios.
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What is the reason for the noise at idle speed that disappears when the clutch is pressed?

The causes of such abnormal noise are as follows: 1. It is basically a problem with the clutch. Most abnormal noises are caused by issues with the clutch release bearing. You can go to a professional repair shop to check the release bearing. Since the release bearing may be loose or detached, when the engine vibrates, the loose release bearing vibrates along with it, producing a rattling sound. When the clutch is pressed, the clutch presses it tight again, so there is no noise. When the clutch is released, the release bearing becomes loose again, and this cycle repeats. 2. Another possibility is that the noise is the sound of the transmission gears. This requires disassembly and inspection to determine the source of the noise. Generally, this kind of noise occurs in new cars and is a sound produced during machine processing, which is difficult to address.
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What to Do with Leftover Engine Oil After Maintenance?

Here are the methods for handling leftover engine oil after maintenance: 1. Seal Immediately: After completing maintenance at a 4S shop or repair shop, immediately tighten the cap of the oil bottle or container. Since the tin foil seal has been broken, the remaining cap gasket provides limited isolation. At this point, you can cover the mouth of the bottle or container with a clean plastic film. To avoid tearing, it's best to fold the film several times before covering, then tighten the cap. This method offers better sealing. If possible, you can also apply wax to the cap for additional sealing. 2. Store in a Dry and Dark Place: After sealing the oil bottle, store it in a dry and cool place, ensuring it is not exposed to sunlight to prevent oxidation of the oil inside. 3. Avoid Pouring It All In: When using the stored oil for the next maintenance, do not pour all of it into the engine. Retain a small portion. Generally, after long-term storage, there may be trace amounts of moisture at the bottom of the oil bottle or container. Adding this to the engine could affect its performance or even cause adverse effects.
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