Can brake oil be mixed？ How long does it take to change？ The old driver told the secret!

Some people say that the standard to measure a person’s driving skills is not how much the highest speed can be driven, but whether he can stop the car at a critical moment! It can be seen that the importance of automobile braking system.

Brake oil, brake pads and brake discs are the only things that need to be replaced frequently in the brake system of a car. Today, Lao Yang will talk about what brake oil is, how to replace it and how long to replace it.

1. What is brake oil?

As we all know, cars nowadays are all hydraulic braking systems. When we step on the brake pedal, we can increase the braking force through the booster pump. The brake master cylinder will pump the brake oil out of the oil pot, and the control valve will distribute the brake oil to the brake cylinders of each brake pipe. After that, the brake oil will push the pistons in the brake cylinders to make the brake pads and brake discs rub. This is the braking principle. If you still don’t understand, you can think about the working principle of the needle tube used for infusion when you were a child.

Second, why should I change the brake oil?

Above know the importance of brake oil, let’s talk about the characteristics of brake oil. Because brake oil works frequently, its stability is better, and it has to withstand the influence of high temperature, and its boiling point is relatively high, otherwise it will boil when it brakes violently, which will affect the braking distance.

The most important point is that brake oil is different from other oils. It has water absorption and may be mixed with water after a long time, which will have an impact.

You might say, why is there water?

Well, the volume of brake oil will change with the change of temperature, so there is a vent hole on the brake oil storage pot. The air sucked from this hole contains moisture or impurities, and the moisture will be absorbed or dissolved by the brake fluid. Once this happens, the braking distance will be extended, causing the brakes to become soft.

3. How long does it take to change the brake oil?

According to the requirements of the manual, the general brake oil requires 20-40 thousand kilometers to be replaced, and different models are different. According to the maintenance cycle of personal driving, it is recommended to change the brake oil every 30 thousand kilometers, and it is best to check it with the brake pads. After all, the brake system is very important.

Finally, the choice of brand, we must pay attention to the brake oil model when changing the brake oil. Generally, vehicle brake fluid is classified by DOT. According to the regulations of american petroleum institute, brake fluid is divided into DOT3, DOT4 and DOT5.1. Therefore, it is necessary to avoid the reaction caused by mixing brake oil.

Secondly, for brands, such as Shell, Mobil and Bosch, if you don’t understand, you can add universal brake oil in 4S shop.

That oil is also the oil that cars often need to change. What should we pay attention to and what is its classification? You can reply in the background of WeChat WeChat official account."engine oil"Two words to check.