What Causes the Humming Sound When Turning the Steering Wheel of a Car?

Is it allowed to turn off the engine when driving a small car down a steep slope?

It is not allowed to turn off the engine when driving a small car down a steep slope, as this operation poses significant safety hazards. Consequences of coasting with the engine off: Coasting with the engine off will result in the loss of brake assistance and engine braking force, relying solely on the friction between the brake pads and brake discs for braking. This can easily cause the brake pads to overheat, leading to a loss of braking effectiveness. Additionally, the power steering pump will also fail, resulting in the loss of steering control, creating a dangerous situation with neither steering nor braking. Correct way to descend a steep slope: When descending a steep slope, use engine braking. For manual transmission cars, shift into 1st or 2nd gear, and for automatic transmission cars, shift to L gear. At the same time, avoid pressing the brake pedal for extended periods.

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Can I Take Subject 4 Before Subjects 2 and 3?

You cannot take Subject 4 before Subjects 2 and 3, as you need the transcript of Subject 3 to take Subject 4. Therefore, you must take Subject 3 first. Below is some information about the test location and passing criteria for Subject 4: Introduction to Subject 4: "Subject 4" is the "Safe and Civilized Driving Knowledge Test" of Subject 3. It is the final part of Subject 3, but the test is conducted in a computer room rather than in a motor vehicle. It is taken only after passing the on-road test of Subject 3, which is why it is separately referred to as "Subject 4." Passing Criteria for Subject 4: The Subject 4 test consists of 50 questions, presented in the form of case studies, images, animations, etc. The maximum score is 100, and a score of 90 or above is required to pass.

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What tests are required for upgrading from C1 to B1 license?

C1 license holders who wish to upgrade to a B1 license need to take three tests, which are: Subject 1 (Road traffic safety laws, regulations, and related knowledge test); Subject 2 (Field driving skills test); Subject 3 (Road driving skills test and safe civilized driving common sense test). C1 driver's license: The C1 driver's license is one of the motor vehicle driver's license codes. The scope of the C1 license includes small and micro passenger vehicles, light and micro cargo vehicles; light, small, and micro special purpose vehicles; and small passenger vehicles with a seating capacity of 9 or fewer people. Application age: The minimum age requirement for a C1 license is 18 years old, with no upper age limit. However, applicants over 70 years old must pass tests on memory, judgment, and reaction abilities.

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What is the wear limit for brake discs?

Brake disc wear is generally determined by a 5-year period or a wear limit of 1.6mm. Below are the relevant details: Brake Pads/Brake Discs: High-end vehicles usually have an alert system to indicate when brake pads need replacement. If this feature is not available, it is recommended to have the maintenance technician check them during each service. The general wear limit for brake pads is 2mm (same for front and rear brake pads). It is advisable to replace them when they wear down to approximately 2mm remaining, as failing to do so may result in longer braking distances and, in severe cases, inability to stop the vehicle. Engine Peripheral Belts: Most vehicles are equipped with peripheral belts. Regardless of the number of belts, they should be replaced every 60,000 kilometers or 4 years. When replacing the belts, the belt guide wheels and tensioners should also be replaced simultaneously. Otherwise, belt breakage or guide wheel jamming during driving may cause the wheels to malfunction.

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What is the reason for the bulge in the middle of the rear seat of a car?

Below are the reasons why there is a bulge in the rear seat of a car: 1. To increase the height between the car chassis and the ground, because the chassis of a family car cannot be too close to the ground, which would threaten driving safety. In the early days of German car manufacturing, a beam structure was used, and the most important feature of this structure is that it can ensure the integrity of the car body in a collision. 2. To protect and arrange the exhaust pipe and drive shaft, the rear seat of the car needs to have a certain bulge. The exhaust pipe and drive shaft need to pass through the middle of the chassis, so a groove must be designed to arrange the drive shaft and exhaust pipe. The design of the groove strengthens the hardness of the chassis and improves the overall safety of the vehicle. 3. Cars with a bulge in the middle of the rear seat have relatively higher body strength than flat-bottomed cars, which is considered for safety to protect the lives of passengers.

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How is the quality of Danfer lubricating oil?

Danfer's lubricating oil is of excellent quality, but the price is relatively high. The following is relevant information: Company Introduction: DANFER (Danfer) Petroleum Company flourished in the early 20th century. During the war-torn years of World War II, due to the outstanding quality contribution of Danfer lubricating oil, it played an extremely important role in the ultimate victory of the Allied forces. Known as the "meritorious" product of the United States, as a high-end military product shaped by the times, it has been widely used in military, aerospace, civilian and many other industries. It manages the Americas, Europe, Asia, and Africa in a coordinated manner, with a sales network covering all parts of the world. Moreover, due to its excellent performance, it is highly favored by consumers. Brand Influence: DANFER (Danfer) lubricating oil is a symbolic product of American lubricating oil. Through a century of brand accumulation in the international market, it has established an unshakable position as a strong brand in the lubricating oil industry.

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What Causes the Humming Sound When Turning the Steering Wheel of a Car?

Is it allowed to turn off the engine when driving a small car down a steep slope?

Can I Take Subject 4 Before Subjects 2 and 3?

What tests are required for upgrading from C1 to B1 license?

What is the wear limit for brake discs?

What is the reason for the bulge in the middle of the rear seat of a car?

How is the quality of Danfer lubricating oil?

What is the method for quickly removing ice and snow from a car?

What to Do If You Lose a Car Key?

What is the top speed of a mountain bike?

Should You Release the Handbrake or Shift Gears First in an Automatic Transmission?