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Can DOT4 Brake Fluid Be Used in a Vehicle Originally Using DOT3?

1 Answers
VanAmara
07/30/25 1:49am
It is not advisable to use DOT4 brake fluid in a vehicle originally designed for DOT3, as DOT3 and DOT4 are different types of brake fluids. Using a brake fluid that does not meet the specified requirements may lead to clogged brake lines and corrosion of rubber components in the system. Additionally, it is essential to choose brake fluid from reputable manufacturers to avoid potential malfunctions during use. The working pressure of brake fluid in the braking system is typically around 2MPa, and can reach as high as 4 to 5MPa. All liquids possess the characteristic of being incompressible. In a sealed container or a pipeline filled with liquid, when pressure is applied, the liquid quickly and uniformly transmits the pressure to all parts of the system. Hydraulic braking systems operate based on this principle.
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How to Match Manual Transmission Gears with Speed?

Manual transmission gear and speed matching method is: 1. Start in 1st gear, when the speed reaches 15 km/h, you can shift to 2nd gear; 2. When the speed reaches 25 km/h, you can shift to 3rd gear; 3. When the speed reaches 35 km/h, you can shift to 4th gear; 4. When the speed reaches 45 km/h, you can shift to 5th gear. You should shift to the appropriate gear according to the speed. Do not drive at low speeds with high gears for extended periods, which is a common mistake made by beginners and will undoubtedly significantly increase fuel consumption. Conversely, driving at high speeds with low gears is also not advisable, as it increases engine load and damages engine lifespan. When shifting gears, you can refer to the engine speed and vehicle speed. Driving at an engine speed close to the peak torque output is more fuel-efficient.
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How to Quickly Register a Vehicle Without a Residence Permit?

Methods for quickly registering a vehicle without a residence permit: Some local police stations may provide a temporary certificate for obtaining a residence permit before the actual permit is issued, which can be used for vehicle registration. It's important to note that not all regions may allow this method for quick registration, so it's advisable to consult the local vehicle management office for specifics. If you plan to purchase a new car, always ensure that all required documents are complete to avoid any delays in registration. For individuals with non-local household registration who start working in a new area, it's recommended to report and register for residence at the local town or street-level migrant population service management agency. Documents required for obtaining a residence permit: 1. Personal resident ID card; 2. Personal photo (residence permit photo receipt) or photo information read from the ID card chip by staff; 3. Residence registration receipt; 4. Proof of local address, employment, or enrollment, among others.
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What does the 'a' on the car mean?

The 'a' on the car refers to the auto-hold function. After turning on this switch, when the vehicle brakes during driving, even if you release the brake pedal, the car will not continue moving. It will only resume driving when the driver presses the accelerator. The features of the auto-hold function include: 1. It prevents the car from rolling during short stops at traffic lights; 2. When starting on an uphill slope, the system automatically applies the brakes to prevent rolling back, and releases the wheels to move forward once you start driving; 3. For some car models, you don't need to pull the handbrake when parking and locking the car, as the system automatically brakes the wheels. Steps to use the auto-hold function: 1. Press the car's brake pedal; 2. Press the car's one-touch start button; 3. The car's dashboard lights up, and the entire vehicle's power is activated; 4. Press the autohold button inside the car to enable the auto-hold mode.
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What is the power difference between 110 and 125?

The difference is approximately 15-20%. Below is relevant information about transmissions: Transmission classification: Transmissions are divided into manual transmissions and automatic transmissions. Manual transmissions consist of gears and shafts, while automatic transmissions are composed of torque converters, planetary gears, etc. Transmission development and reform: With the continuous development of the automotive industry, transmissions have evolved from manual to automatic. Transmissions allow vehicles to reverse without changing the engine's rotation direction, and shifting into neutral can interrupt power to enable engine start-up and gear changes. Owners using automatic transmissions can easily operate their vehicles, and compared to manual transmissions, automatic transmissions are less prone to malfunctions.
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What is the correct start-stop sequence for one-button start?

The correct start-stop sequence for one-button start is: 1. After the driver sits in the driver's seat, press the start button once, at which point the ACC light turns on, then press it once more for the vehicle to perform a self-check; 2. Depress the brake pedal and press the one-button start key to ignite and start the engine; 3. Release the foot brake, and you can choose to warm up the vehicle in place, with the duration depending on the environment; 4. Depress the foot brake again, shift to D gear, and release the handbrake (for electronic handbrakes, simply press the button briefly); 5. Slowly release the foot brake, apply some throttle, and the start is complete. The parking sequence is: 1. Depress the brake pedal to bring the vehicle to a smooth stop; 2. Shift the gear from D to N, and at the same time tighten the handbrake (for electronic handbrakes, pull up the button); 3. Continue to depress the foot brake and shift the gear from N to P; 4. Release the foot brake, press the one-button start key, and turn off the power to complete the parking.
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Where does the Lan-Nan Expressway run from and to?

The Lan-Nan Expressway runs from Lankao to Nanyang, abbreviated as Lan-Nan Expressway. The Xuchang to Yexian section of the Lan-Nan Expressway has been incorporated into the national expressway G0421 (Xu-Guang Expressway). It starts in Lankao County, Kaifeng City, and ends in Nanyang City. The Xuchang-Pingdingshan-Nanyang section of the Lan-Nan Expressway was opened to traffic on December 12, 2004, and the Lankao-Xuchang section was opened to traffic on November 19, 2005. The Lan-Nan Expressway passes through Lankao, Yanling, Xuchang, Pingdingshan to Nanyang, and intersects with the Lian-Huo Expressway, Ri-Lan Expressway, Nan-Luo Expressway, Jing-Gang'ao Expressway, Hu-Shaan Expressway, Da-Guang Expressway, and Er-Guang Expressway.
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