How long can you drive with a punctured BMW run-flat tire?

What Causes Brake Noise in a New Volkswagen Lavida?

Brake noise in a new Volkswagen Lavida is normal because both the brake pads and discs are brand new and still in the break-in period. It typically disappears after a few hundred kilometers. Brake noise generally stems from three main causes: scratches on the brake disc, misaligned brake pads or inconsistent brake dimensions, or issues with the brake material itself. Below are the relevant details: 1. Scratches on the brake disc: The likelihood of the original brake pads scratching the original brake disc is over 50%, but scratches do not necessarily lead to noise. As a result, 90% of repair shops and drivers do not believe the original brake pads can damage the disc. Therefore, when replacing the pads, they often do not proactively check for scratches on the brake disc. Only when the new pads start making noise do they inspect and realize the new pads do not fit well with the scratched disc, ultimately causing the noise. Solution: Always inspect the brake disc for scratches before replacing the pads. If scratches are found, it is advisable to smooth them out or replace the disc. 2. Misaligned brake pads or inconsistent brake dimensions: If the brake pads are misaligned during installation, localized friction can cause noise. Additionally, friction blocks of the same brake pad model may vary in size, especially in width. The dimensional discrepancy between manufacturers can be up to three millimeters. If brake pads of inconsistent dimensions are installed, poor fitment can also lead to noise. Solution: Reinstall brake pads that match the original model specifications. 3. Issues with the brake material itself: The noise referred to here occurs when the brake disc surface is completely smooth and flat. The reason is that current national regulations prohibit the use of asbestos-containing brake pads, but a small number of manufacturers still produce and sell them. While semi-metallic asbestos-free brake pads have a longer service life, their harder material can cause brake noise. In contrast, asbestos brake pads, being softer, often result in noise. Solution: Carefully select high-quality brake pads and replace them with better-performing ones.

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What brand is the transmission of the Great Wall M4?

United Automotive Electronic Systems Co., Ltd. (UAES) supplies the transmission for the Great Wall M4. Established in 1995, UAES is a joint venture between China United Automotive Electronic Co., Ltd. and Robert Bosch GmbH in Germany. The company primarily engages in the development, production, and sales of gasoline engine management systems, transmission control systems, body electronics, hybrid and electric drive control systems. Its headquarters is located in Pudong New District, Shanghai. The AMT transmission, short for Automated Manual Transmission, is an automatic shifting system with microcomputer control based on dry clutches and gear transmissions. The 6AT transmission refers to an automatic transmission with six forward gears, meaning it has six sets of gear groups with different transmission ratios. For the Great Wall M4's transmission, the following points should be noted during daily use: Do not delay transmission fluid changes for extended periods. Prolonged failure to change the transmission fluid can damage internal components such as bearings and the housing. Avoid prolonged coasting in neutral. While many experienced drivers coast in neutral with manual transmissions, doing so with an automatic transmission can cause overheating and create a jolt when shifting back to Drive (D). Never shift into Drive (D) or Reverse (R) before the vehicle comes to a complete stop. Some drivers shift into reverse while still moving to demonstrate smooth operation, but this can severely damage the transmission gears and lead to gear grinding over time. Avoid frequently climbing steep slopes in Drive (D). Automatic vehicles may overheat under heavy load or upshift too early, resulting in insufficient power. In such cases, use manual mode to lock in lower gears or switch to sport mode to protect the transmission. Do not tow the vehicle over long distances. If an automatic vehicle breaks down, it should be transported on a flatbed tow truck with the transmission in Neutral (N). Towing with a rope or dragging the vehicle directly is not recommended.

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How many questions are there in Motorcycle Subject 4?

Subject 4 test consists of 50 questions, mainly in the form of cases, pictures, animations, etc., with a full score of 100 and a passing score of 90. Subject 4, also known as Subject 4 theory test or driver theory test, is part of the motor vehicle driver's license assessment. After the implementation of the Ministry of Public Security Order No. 123, Subject 3 test was divided into two parts: in addition to the road test, a safety and civilization knowledge test was added, commonly known as "Subject 4", which examines "driving ethics". Because this test is conducted after Subject 3, it is commonly referred to as the Subject 4 test. Officially, there is no Subject 4. If Subject 4 is not passed, there is no need to retake the previously passed tests (Subject 1, Subject 2, Subject 3). You can schedule a retest on your own, and no retest fee is required. There are no scheduling restrictions, but the validity period of the driving skill test permit is three years. If the applicant does not complete the test within the validity period, the passed subject scores will be invalidated.

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Which way does the car body go when the steering wheel is turned to the right?

When the steering wheel is turned to the right, the car body also moves to the right. The direction of the car body movement is consistent with the direction of the steering wheel. Some tips for turning the steering wheel: First, the correct hand position on the steering wheel should be at the "9 and 3 o'clock" positions. When turning the steering wheel, keep both hands on it and rotate up to 180 degrees in each direction. Methods and correct posture for turning the steering wheel: Maintain an upright posture while actively steering. Adjust the seat height and position to the correct state. Keep your eyes looking straight ahead, with your left hand lightly holding the upper left part of the steering wheel and your right hand lightly holding the upper right part. Both hands should be relaxed and naturally positioned, with thumbs pointing straight along the top of the steering wheel and the other four fingers gently wrapped around from the outside. Hand movements should be balanced to avoid unnecessary shaking. If the steering wheel is affected by uneven road surfaces causing front wheel deflection or vibration, firmly grip the steering wheel to prevent injury to fingers or wrists during violent movements. When the front left (or right) wheels deviate, correct the direction by steering to the right (or left), gradually returning the steering wheel to center as the vehicle straightens.

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What Octane Gasoline Should the Volkswagen Talagon Use?

The Volkswagen Talagon with the 2.0T four-cylinder engine requires 98-octane gasoline, while the six-cylinder version can use 95-octane gasoline. These octane ratings are recommended in the vehicle's official user manual. In addition to checking the suitable octane rating in the user manual, you can also find it on the fuel tank cap, which is usually labeled. Typically, the octane rating can also be determined based on the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92-octane gasoline, those between 10.0-11.5 should use 95-octane gasoline, and those with a higher compression ratio should use 98-octane gasoline. However, with the use of new technologies, the octane rating cannot be solely determined by the compression ratio, as engines with high compression ratios can also be tuned to use lower-octane gasoline. Other factors, such as ignition timing, turbocharging technology, and Atkinson cycle technology, also play a role. Generally, the higher the octane rating, the higher the octane number and the better the anti-knock performance. 92-octane gasoline contains 92% isooctane and 8% n-heptane, while 95-octane gasoline contains 95% isooctane and 5% n-heptane. If the Volkswagen Talagon occasionally uses the wrong octane rating, simply switch back to the correct one after the current tank is used up. However, long-term use of the wrong octane rating can have the following effects: For vehicles designed for lower-octane gasoline, using higher-octane gasoline will not cause damage, but the increased octane number may alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. For vehicles designed for higher-octane gasoline, using lower-octane gasoline can cause engine knocking. The significantly lower octane number reduces the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance is created during the upward stroke. This resistance makes the engine run very unevenly. Mild knocking may only increase noise without significant engine damage, but severe knocking indicates serious engine issues, affecting driving stability and causing abnormal wear on pistons and cylinders, potentially leading to cylinder scoring.

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Where to Maintain New Energy Vehicles?

For new energy vehicle models, especially pure electric models, it is best to go to a 4S shop for maintenance. After all, the popularity is not yet comprehensive, and the professionalism of external auto repair shops may not be consistent. Maintenance methods for new energy vehicles: Battery inspection: The most unique aspect of new energy vehicles is the large battery inside the car. Regular battery inspection is an essential task. If during the use of the battery, the charging time becomes longer or the driving range suddenly becomes shorter, it is necessary to consider whether there is a problem with the battery. Other aspects of the vehicle: The biggest difference between pure electric vehicles and fuel models is the absence of an engine and transmission. However, the body structure or other parts of the vehicle are no different from pure fuel models. Therefore, pure electric vehicles should be maintained according to the principle of maintenance every 5,000 kilometers. Daily use: Pure electric vehicles also require great attention in daily use. First, the charging time for new energy vehicles should not be too long. After receiving the charging prompt, charging should be done immediately, otherwise over-discharging the battery will affect its lifespan. Avoid over-discharging the battery: When starting, the accelerator should be pressed lightly to avoid high discharge from the battery, which could affect the physical performance of the battery plates. If the vehicle is parked for a long time, the battery should also be fully charged.

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