After winter, a lot of car owners pay attention to the maintenance of the car, will change the oil in time, check the replacement of antifreeze and so on. But it ignored the important part of driving safety - brake oil.

One, what is brake oil? Brake fluid = brake fluid

Brake fluid is a liquid medium for transmitting brake pressure in the hydraulic brake system of the automobile, which is used in the vehicle using the hydraulic brake system. The brake fluid is called brake oil or oil pressure, brake braking system is indispensable part in the braking system, it is passed as a force of the media, because the liquid is not compressed, so the total pump output pressure will be directly transmitted to the brake fluid through the pump.

Two. How to select high quality brake fluid

1. appearance: the appearance of high quality brake fluid is similar to honey, it is pale yellow or dark yellow, and the friction will become more and more hot after dropping in the palm of hand. Poor quality brake oil will contain alcohol, liquid like water, and some impurities and suspending substances may appear.

2. boiling point: the higher the boiling point is, the temperature will rise to a number of Baidu when the car runs for a long time. If the boiling point of the brake fluid is not high enough, once the brake fluid increases with the temperature of the brake pad, it will vaporize and generate bubbles, which will lead to the failure to brake immediately, and cannot guarantee the safety of driving.

3. freezing point: the most important point of the brake fluid is the better liquidity, which is particularly important in the cold region. High quality brake fluid is still sensitive and reliable in low temperature environment. But the solidification point of the inferior brake fluid is high. When the temperature is reduced to a certain extent, the solidification phenomenon will occur, which greatly reduces the braking performance.

4. corrosivity: high quality brake fluid has little corrosion to metal and rubber, which can prolong the life of brake oil pump. But the inferior brake fluid has a great corrosive effect on metal and rubber, which can cause oil leakage, brake and so on, causing serious accidents.

Three. Replacement of brake fluid

The brake fluid should be replaced in time when it is used in a certain time. Generally speaking, a brake fluid is checked after driving 1~2 kilometers, and a brake fluid must be replaced when 3~4 kilometers or 2 years. After entering the winter, the brake fluid used before is likely to not meet the temperature requirements, and should be checked and replaced in time.

The best replacement of the brake fluid to professional or specialized shops 4S shop. Before changing the brake fluid, we should pay attention to whether the maintenance personnel first use alcohol to clean the brake system, and the brake fluid of different brands can not be mixed, so we need to clean the brake system. When changing, it is necessary to identify the inferior brake fluid by appearance.

Brake is the most important part of the vehicle, and the brake fluid plays a vital role in it. So we should check it in time and replace it in time in order to prevent the accident.