Presumably, during the use of motorcycles, everyone wil […]
Presumably, during the use of motorcycles, everyone will not read many of the maintenance contents specified in the maintenance manual. The brake oil of the motorcycle is a maintenance item that is regularly replaced. The replacement cycle of most motorcycle brake oil is recommended 2- 40,000 kilometers, but many of our owners' motorcycles have not been replaced until they are scrapped. The front disc brake of the motorcycle is broken. It is always considered that the brake pump is malfunctioning. In fact, many of the brake fluids are not replaced regularly. Some motorcycle owners feel that their disc brakes have always been good. Does that mean that the brake fluid of the motorcycle does not need to be replaced? Of course not. The brake fluid must be checked and maintained regularly. No accident does not mean that the brake fluid used for a long time will not deteriorate.
Regular replacement of brake fluid is considered by some motorcycle owners to be a profit-making method for businesses. In fact, the real merchant reminds you to change the brake fluid. For the owner, it can be regarded as a professional and conscientious business, and it is a guarantee for users' driving safety. The brake system uses the principle of liquid incompressibility to brake, so why can't water be used to replace brake fluid?
The motorcycle disc brake system mainly uses the principle that liquid cannot be compressed to convert kinetic energy into heat energy.
However, a real brake system will produce heat during the working process, and the heat is mainly generated because the brake fluid is pressurized during the braking process, which causes the friction between molecules to increase. On the other hand, the reason is The temperature of the brake pad is as high as 300 degrees during the braking process, and this part of the heat will be transferred to the brake fluid along the brake piston, so the braking system has a very high requirement for the boiling point of the brake fluid.
At this time, if water is used as the brake fluid, the heat generated during the braking process of the motorcycle will make the water boil and evaporate into water vapor, and the gas has a characteristic that it can be compressed. In this case, the brake system can only The braking effect can only be produced after the gas is compressed. In this case, the braking must fail. Therefore, brake fluid cannot be replaced with water! There should be no water in the brake fluid!
Water and air in the brake fluid can cause brake failure
In fact, the water content in the brake fluid is essentially the same as the air. As mentioned above, the brake system generates a lot of heat when braking. When the brake fluid acts on the brake fluid, the water in the brake fluid is heated to evaporate into water vapor. Water vapor can be compressed, and there is one more process in the braking process. That is, the air is compressed first. When the air is compressed, the force will compress the brake fluid, thereby producing the braking effect.
Why does the brakes need to be replaced regularly while there is no problem with the brakes?
The boiling point of motorcycle brake fluid is directly related to the water content. The higher the water content, the lower the boiling point.
Experiments have proved that when the water content in the brake fluid reaches more than 3%, the boiling point of the brake fluid is reduced by 25%, which means that the boiling point of the brake fluid with a boiling point of 200 degrees at this time is reduced to 150 degrees; when the water content exceeds 7% , The boiling point of the brake fluid is reduced to more than 50%, which means that the boiling point of the brake fluid may be 100 degrees at this time, so there will be serious safety hazards during the high-intensity braking process.
Although most brake fluids are drainable, no one can guarantee that moisture will never appear in the brake fluid during use. Therefore, check and replace the brake fluid daily.