The Influence And Discussion Of Brake Fluid On Loader Braking Performance (2)

The Influence And Discussion Of Brake Fluid On Loader Braking Performance (1)
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When the pipes of the brake system are filled with steam and gas exists, due to the relatively high compressibility of the gas, and the brake pedal feels soft and elastic when you step on it, it means that air has penetrated into the brake fluid. The braking effect will become worse, safety will be reduced, and the braking response speed will be reduced. Especially in mountains and mountainous areas, frequent braking will increase the temperature of the brake fluid. If the boiling point of the brake fluid is low, it is easier to cause cavitation in the braking system and damage the rubber sealing ring and brake components of the afterburner pump. cause damage. This will cause the braking system to completely fail and endanger personal safety. In addition, when there is gas in the brake fluid pipeline of the brake system, when the brake pedal is released, because the expansion speed of the gas is faster than the speed of the brake fluid, sometimes a flow from the brake oil cup of the booster cylinder to the brake fluid cup will occur. The phenomenon of external oil spraying. Brake fluid with a low boiling point seriously affects the braking performance of wheel loaders. At present, most domestic wheel loaders use 719 synthetic brake fluid, which is equivalent to HZY3 of domestic GB12981-2003 and DOT3 of the international standard. The dry boiling point of this brake fluid is 205°C. The dry boiling point refers to the fluid just removed from the sealed container. The boiling point of some inferior brake fluids is lower after being added to the brake system, and some inferior brake fluids have lower dry boiling points, thus affecting braking safety.

3. Impact on wheel loader braking performance

(1) When the pipes of the brake system are filled with steam and gas exists, due to the relatively high compressibility of the gas, and the brake pedal feels soft and elastic when you step on it, it means that air has penetrated into the brake fluid. The braking effect will become worse, safety will be reduced, and the braking response speed will be reduced. Especially in mountains and mountainous areas, frequent braking will increase the temperature of the brake fluid. If the boiling point of the brake fluid is low, it is easier to cause cavitation in the braking system and damage the rubber sealing ring and brake components of the afterburner pump. cause damage. This will cause the braking system to completely fail and endanger personal safety. In addition, when there is gas in the brake fluid pipeline of the brake system, when the brake pedal is released, because the expansion speed of the gas is faster than the speed of the brake fluid, sometimes a flow from the brake oil cup of the booster cylinder to the brake fluid cup will occur. The phenomenon of external oil spraying. Brake fluid with a low boiling point seriously affects the braking performance of wheel loaders. At present, most domestic wheel loaders use 719 synthetic brake fluid, which is equivalent to HZY3 of domestic GB12981-2003 and DOT3 of the international standard. The dry boiling point of this brake fluid is 205°C. The dry boiling point refers to the fluid just removed from the sealed container. The boiling point of some inferior brake fluids is lower after being added to the brake system, and some inferior brake fluids have lower dry boiling points, thus affecting braking safety.

(2) Inferior brake fluid has strong water absorption. The water vapor contained in the air is absorbed by the brake fluid and water enters the brake fluid when working in rainy days. When water enters the brake fluid, the boiling point of the brake fluid will drop. , so the brake fluid’s ability to resist air resistance is also greatly reduced. During use, if you find that a large amount of water has entered the brake fluid for some reason, you must replace it with new brake fluid in time. When updating the brake fluid, you must wipe the brake system dry. Water and other oils are strictly prohibited. Mix in.

4. Simple identification method of brake fluid and precautions for use

(1) Pour a little brake fluid on the palm of your hand. Real brake fluid will generally feel a little cold at first, and then feel a little warm after a while, and the brake fluid does not evaporate easily: if the brake fluid feels abnormally cold, there is no heat. If it feels like it will evaporate slowly, it is likely to be fake brake fluid.

(2) Before changing the brake fluid, be sure to clean the oil, dirt, etc. from the brake system filler port, bleeder screw, etc. to prevent impurities from entering the brake system and contaminating the brake fluid. The brake system should be cleaned according to the provisions of the maintenance manual. It is recommended to use the same type of brake fluid to clean each pipeline of the brake system. It is best not to use alcohol, cleaning agents, etc.

(3) Brake fluid has certain toxicity and cannot be absorbed by mouth.

(4) Brake fluid has a destructive effect on the coating on the surface of the car body, causing “paint biting”. Therefore, when replacing and filling brake fluid, be careful to prevent the brake fluid from dripping on the coating of the vehicle body and corroding the surface of the loader, causing the machinery to rust.

(5) It is strictly prohibited to mix it with other brake fluids. Due to the different raw materials, additives and manufacturing processes used in different types of products, turbidity or precipitation will occur after mixing. This will not only greatly reduce the performance of the original brake fluid, but the precipitated particles will block the pipeline and cause serious brake failure. as a result of. Even the same type of brake fluid with good compatibility cannot be mixed if the brands are different. Because of good compatibility, it only means that no stratification, turbidity and precipitation will occur after mixing with other products. It does not mean that the performance after mixing will not change. The additives added to each product are different and there is a relative balance between them. Once If other substances are mixed in, the balance may be destroyed, thereby losing or reducing its intended effect. Therefore, when changing brands, be sure to clean the lines with the product to be added.

5. Conclusion

Wheel loader brake fluid is an important medium for the loader braking system to transmit power, and is a major factor related to wheel loader braking safety. Due to the influence of some counterfeit brake fluids in recent years, the quality of automobiles and wheeled engineering machinery has increased. Reduced braking performance poses a threat to personal safety and should attract the attention of wheel loader users.