How much does it cost to replace brake oil in a Chang'an Yidong? The replacement of brake oil requires a cycle of air elimination, which costs about 200 yuan. It is generally recommended to replace it every two years or 40,000 kilometers.

There are three types of brake fluid:

1. When buying, choose a reliable manufacturer and the higher the level is better. Its working pressure is usually 2MPa, with a maximum of 45MPa;

2. All liquids have the property of being incompressible. When the liquid is under pressure in a sealed container or a full pipeline, it will quickly and evenly transfer the pressure to all parts of the liquid. This is the principle of using pressure to work.

3. It is important to choose the right type of brake fluid for your vehicle. For example, DOT 3, DOT 4, and DOT 5 are the most common types of brake fluids. DOT 5 is the best choice for high-performance vehicles.

In addition to the type of brake fluid, you should also pay attention to the quality of the brake fluid. A good brake fluid should be able to resist heat, moisture, and air contamination.

To ensure the safety of your car, it is important to replace the brake fluid regularly. If you notice any signs of contamination, such as a strange odor or a change in the color or texture of the brake fluid, you should immediately have it checked by a professional mechanic.

In conclusion, the cost of replacing brake oil in a Chang'an Yidong is about 200 yuan, and it is recommended to do it every two years or 40,000 kilometers. When choosing a brake fluid, pay attention to the type and quality of the product, and have it checked regularly by a professional mechanic.