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What is the Function of the Brake Master Cylinder?

3 Answers
McHenry
07/29/25 10:11pm
The primary function of the brake master cylinder is to convert the mechanical force applied to the brake pedal and the force from the vacuum booster into hydraulic pressure. It then delivers the pressurized brake fluid through the brake lines to the wheel cylinders (slave cylinders) at each wheel, where the wheel brakes transform it into braking force. Additional details about the brake master cylinder are as follows: The brake master cylinder, also known as the hydraulic brake master cylinder, serves as the power source for the service brake system. The braking force originates from the pedal force applied by the driver and the vacuum from the engine intake manifold (vacuum assist), with the vacuum being the primary power source for the master cylinder. There are two types of brake master cylinders: 1. Single-chamber type: Suitable for single-circuit systems; 2. Dual-chamber type: Suitable for dual-circuit systems.
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DelMaci
08/15/25 10:27pm
I remember when I first started driving, I was quite curious about the braking system. Later, I learned that the brake master cylinder acts like a commander. When you press the brake pedal, it converts the force from your foot into hydraulic pressure, which is then transmitted through the brake lines to the brakes at each wheel, clamping the discs or drums to slow down or stop the car. Its core function is to ensure the braking system responds quickly, especially in emergencies. If the master cylinder leaks or its internal components wear out, the brakes can become spongy, making driving extremely dangerous. Once, my old car had poor braking performance due to an aging and leaking master cylinder. After promptly replacing it, everything returned to normal. Now, I regularly check the brake fluid level and color changes to prevent moisture from mixing in and causing internal corrosion. Though small, it is the cornerstone of safe driving.
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_travis
10/17/25 8:12am
In my daily car maintenance routine, the brake master cylinder is definitely a component I pay close attention to. It's essentially a hydraulic converter – when you press the pedal, the force gets transmitted to the master cylinder piston, which pushes brake fluid to create pressure. This pressurized fluid then flows to the wheel cylinders to squeeze the brake pads. If the master cylinder fails, such as when aging seals cause fluid leaks or air enters the lines, you'll notice a soft or sinking brake pedal feel, and in severe cases, complete brake failure. I believe everyone should learn to check the master cylinder fluid level – just pop the hood and inspect the reservoir's fluid color and level. If the fluid appears discolored or falls below the minimum mark, it's time for a fluid change or system inspection. Never delay these checks – while maintenance is simple, it's literally a lifesaver, especially during mountain driving or in rainy conditions when reliable braking can be critical.
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Can China 5 Vehicles Be Licensed After the Implementation of China 6 Standards?

After the implementation of China 6 standards, China 5 vehicles can no longer be licensed, but newly licensed China 5 vehicles can still continue to be used. Below is an introduction to China 5 and China 6: Introduction to China 6 Standards: Compared to China 5, China 6 standards impose stricter requirements on carbon monoxide, nitrogen oxides, and hydrocarbons in emissions. Additionally, China 6 standards include new regulations on PN particulate matter. Introduction to China 5 Standards: During the China 5 phase, emission standards for diesel and gasoline vehicles differed. However, China 6 adopts a fuel-neutral principle, meaning the emission limits are the same regardless of the fuel type. Differences Between China 6 and China 5: After the formal implementation of China 6 standards, the main impact will be on the production, import, sale, and registration of new vehicles. Existing China 5 vehicles will no longer be allowed to be registered or licensed. However, previously registered and licensed China 5 vehicles can still be used, will not affect normal annual inspections, and can be traded as used vehicles. The China 6 standard will be one of the strictest standards globally. After July 1, 2019, China 5 vehicles in most regions of the country will no longer be eligible for licensing, and many regions have already or will implement the China 6 standard ahead of schedule.
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What are the precautions for purchasing a new car?

When purchasing a new car, pay attention to the vehicle's manufacturing time, check the glass markings, and inspect the inner wall of the exhaust pipe. Check the vehicle's manufacturing time: On the nameplate of the co-driver's door, there is the vehicle's manufacturing date. For domestic cars, it should not exceed three months, and for imported cars, it should not exceed six months. Otherwise, it might be a stock car. Check the glass markings: Check if the glass markings are consistent with the original factory. The production date should not be later than the factory's date. The numbers represent the year, and the dots represent the month. If the dot is in front, subtract it from 7; if it's at the back, subtract it from 13. If the markings on all four glasses are different, it might be an accident car. Check the inner wall of the exhaust pipe: The mileage should preferably not exceed 50 kilometers. Inspect the inner wall of the exhaust pipe for any black traces. If it's noticeably black, it might be a test-drive car. Check the car paint under both direct and indirect light for scratches. Small dents should be repainted smoothly.
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Is a Power of Attorney Required for Out-of-Province Vehicle Annual Inspection?

Out-of-province vehicle annual inspection requires a power of attorney. Introduction to Vehicle Annual Inspection in Another Location: Vehicle annual inspection in another location refers to conducting the vehicle's annual inspection in a place other than where it was purchased. For example, if the owner purchases the vehicle and registers it in City A but primarily uses it in City B, this creates a situation of using the vehicle in a different location. Since vehicles require periodic inspections every few years, driving the vehicle back to City A for inspection can be very inconvenient. This leads to the need for an out-of-city vehicle inspection, meaning a vehicle registered in City A undergoes inspection in City B. Documents Required for Out-of-City Vehicle Inspection: First and foremost, the most important document is the Power of Attorney for Out-of-City Vehicle Inspection. When conducting an out-of-city vehicle inspection, you must first obtain this Power of Attorney, then bring it along with other relevant documents to the local vehicle management office where the inspection is to be performed. To apply for the Power of Attorney, you need to submit the owner's ID card, vehicle insurance documents, vehicle registration certificate, original and copy of the vehicle and vessel tax, and an application for out-of-city inspection to the vehicle management office in the registration location. During the inspection, you must bring the vehicle registration certificate, insurance documents, and the Power of Attorney to the designated vehicle management office. It is important to note that the vehicle undergoing inspection must not have any unresolved traffic violations.
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How many kilometers can the XPeng G3 electric vehicle run?

The XPeng G3 electric vehicle comes in two variants, offering ranges of 520 kilometers and 460 kilometers respectively. Below is a detailed introduction to the XPeng G3 electric vehicle: 1. The XPeng G3 520i Premium Edition, which was announced in April this year and made its debut at the 2020 Chengdu Auto Show in July. In terms of basic parameters, the XPeng G3 520i Premium Edition is equipped with a second-generation permanent magnet synchronous motor, delivering a maximum power of 145kW and a peak torque of 300N·m. The battery type is a ternary lithium battery with a capacity of 66.5kW·h, providing an NEDC comprehensive range of 520km. 2. The XPeng G3 boasts a peak torque of up to 300N·m, ensuring strong performance even in economy driving mode. It can outpace most gasoline-powered cars from a standstill at traffic lights and accelerates effortlessly up to 70km/h, making city driving and overtaking stress-free. 3. The XPeng G3 is equipped with the XPILOT autonomous driving assistance system, which includes ACC adaptive cruise control. This feature allows the car to automatically follow and stop within a safe distance without manual intervention, simplifying the driving experience. Combined with ATC adaptive curve cruise and LCC lane centering assist system, the vehicle achieves Level 2.5 intelligent driving, reducing driver fatigue and ensuring road safety.
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Can Running a Red Light with Temporary License Plates Be Captured?

It can be captured. According to Article 90 of the Road Traffic Safety Law, motor vehicles that violate traffic signal lights will be given a warning or fined 200 yuan, along with 6 penalty points. Temporary license plates are paper-based motor vehicle license numbers that allow temporary road use. Traffic violation penalties are not related to temporary or formal license plates but are primarily imposed for illegal driving behavior. At least three photos are required to confirm running a red light: the vehicle has not left the stop line when the red light is on; the vehicle passes through the intersection when the red light is on; the vehicle has crossed the line and continues to move forward when the red light is on. Article 26 of the Road Traffic Safety Law: Traffic signal lights consist of red, green, and yellow lights. A red light indicates prohibition of passage, a green light indicates permission to pass, and a yellow light indicates a warning. Article 44: Motor vehicles passing through intersections shall proceed according to traffic signal lights, traffic signs, traffic markings, or the command of traffic police. Ways to avoid running a red light: When there are arrow signal lights, follow the arrow light; otherwise, follow the round light; When the red light is on, the front of the vehicle must not cross the stop line; When the yellow light is on, the front of the vehicle must not cross the stop line; When the green light just flashes, if the distance is close and the speed is fast, you should pass because braking may not stop the vehicle in time to avoid crossing the stop line; if the distance is far, the speed is slow, or the intersection is congested, you should stop; When driving in the city, develop the habit of looking for traffic lights whenever you see a crosswalk or stop line and approach an intersection.
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What Causes the Engine Fault Yellow Light to Stay On?

When the engine yellow fault light is on, it means a warning, indicating that some system parameters of the car may exceed the set range. At this time, the car can continue to drive, but some functions may be limited. The engine fault light can also be red. When the red fault light is on, it means prohibition. At this time, the car must stop immediately, turn off the engine, and prohibit continued driving, and check where the fault occurred. There are mainly the following 7 reasons for the engine fault light to stay on: Sensor failure: The sensors mentioned here include water temperature, crankshaft position, air flow, intake temperature, oxygen sensor, etc. When these sensors are damaged, have poor contact, or signal interruption, the car's ECU cannot accurately obtain engine data, which will cause the engine fault light to come on. Oil quality issues: If fuel and engine oil are not added according to the manufacturer's requirements, it may cause engine wear and trigger the fault light. Poor combustion of the air-fuel mixture: Poor combustion of the air-fuel mixture can lead to engine carbon deposits or knocking. After being detected by the oxygen sensor and reported to the ECU, the fault light will come on as a warning. Spark plug failure, ignition coil failure, fuel pump failure, and fuel line blockage can all cause poor combustion of the engine air-fuel mixture. Turbocharging issues: The intake boost pipeline and turbocharger can also cause the engine fault light to come on. The most common is turbocharger damage, accompanied by symptoms such as oil leakage, high oil consumption, reduced power, metal noise, and blue or black smoke from the exhaust pipe. Intake issues: If there is a problem with the car's intake, it may cause engine pipeline blockage, and in severe cases, trigger the engine fault light. A dirty air filter that is not cleaned regularly can lead to intake problems. Exhaust issues: Exhaust faults can also cause the engine fault light to come on. The rear oxygen sensor, three-way catalytic converter, exhaust camshaft, and bearing failure are all causes of exhaust problems, with the three-way catalytic converter being the most common. Using leaded gasoline, lead or silicon-based lubricant additives, physical damage to the three-way catalytic converter, and engine fuel supply system faults can easily cause three-way catalytic converter failure. Anti-theft system failure: If the car's electronic anti-theft system fails, or the anti-theft controller does not match the engine electronic controller, the anti-theft system can also cause the engine to malfunction and trigger the fault light. If the engine fault light is on, you can follow these steps: First, check if the engine is running normally and if there are any issues like shaking or smoke. If so, try not to restart the engine. Especially note that if the red light is on, do not restart the engine. If the engine can be started, turn it off for 5-10 minutes, then without pressing the brake, press the start button once or turn the key halfway to the 'on' position without pressing the clutch. The car will perform a self-check after powering on. Wait for 5-10 seconds and observe if the fault light on the dashboard turns off. If the fault light does not turn off, please visit a service station as soon as possible to identify the cause. The service station can use a portable diagnostic tool to read the fault code, obtain fault information, and perform targeted repairs.
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