Castor oil alcohol brake fluid is no longer used. At present, mineral oil brake fluid has gradually stopped using synthetic brake fluid, and synthetic brake fluid is widely used. It is made of ether, alcohol and ester mixed with additives such as lubrication, oxidation resistance, rust prevention and rubber swelling resistance. It has a wide working temperature range, easy flow at low temperature, flexible braking, high boiling point, small evaporation loss at high temperature, not easy to produce air resistance, and low corrosion to metal and rubber parts, so it is widely used.
1. Requirements for brake fluid performance of forklift
(1) Good low temperature performance: if the brake fluid has poor fluidity and is easy to solidify at low temperature, the pipeline and pump will be blocked. When braking, the brake pedal will feel very hard and cannot be pressed. Generally, the brake fluid shall not solidify at - 40 ℃ and flow freely.
(2) Proper viscosity: if the viscosity is too large, the low-temperature fluidity becomes poor and the braking performance decreases; The viscosity is too small to provide reliable lubrication in high temperature environment and is easy to leak. In order to ensure that the brake cylinder and rubber cup can slide well, the brake fluid is required to have appropriate viscosity.
(3) High boiling point: the forklift frequently moves forward and backward in each working cycle, and the brake friction plate is in the braking state for a long time, which increases the temperature of the braking system. If the brake fluid with low boiling point and easy to evaporate is used, the pipeline of the local braking system will be filled with brake fluid steam, resulting in air resistance and braking failure. Therefore, it is required that the brake fluid should have a high boiling point (dry boiling point is the boiling point when the brake fluid does not contain water, and wet boiling point is the boiling point when the brake fluid contains certain water) and a low evaporation to reduce the generation of air resistance.
(4) Good corrosion resistance: in order to ensure that the long-term use of brake fluid will not corrode metal pipelines and components, anti rust agent is required to be added to the brake fluid.
(5) Good chemical stability: when the brake fluid is used at high temperature for a long time, it is required not to produce thermal decomposition and coincidence to increase the viscosity of the oil, and it is not allowed to produce oil sludge deposits.
(6) Small impact on rubber: there are many rubber seals in the braking system. In order not to reduce the mechanical strength and elasticity of rubber seals such as brake cups, the influence of brake fluid on the expansion rate of rubber is required to be small, so as to avoid abnormal changes in strength, volume and quality caused by long-term immersion of rubber cups in brake fluid.
2. Precautions for using brake fluid
(1) Pour a little brake fluid on the palm. The real brake fluid will generally feel a little cold at first, and then feel a little hot after a while, and the brake fluid is not easy to volatilize; If you feel that the brake fluid is abnormally cold and will volatilize slowly, it is likely to be a fake brake fluid.
(2) Before changing the brake fluid, be sure to clean up the oil and soil at the fluid filling port and bleeder screw of the brake system to prevent impurities from entering. The brake system shall be cleaned according to the provisions of the maintenance manual. It is recommended to use the same type of brake fluid to clean the brake system. It is better not to use alcohol, cleaning agent and the like.
(3) Brake fluid has certain toxicity and cannot be absorbed by mouth.
(4) The brake fluid has a destructive effect on the coating of the body surface, which will produce "paint biting phenomenon". Therefore, during replacement and filling, it is necessary to prevent the brake fluid from dripping on the coating of the body.
(5) Do not mix with other brake fluids. After mixing, there will be turbidity or precipitation, which will not only greatly reduce the performance of the original brake fluid, but also the precipitated particles will block the pipeline, resulting in serious consequences of brake failure. Even the same kind of brake fluid with good compatibility cannot be mixed if the brands are different. Because of good compatibility, it only means that there is no stratification, turbidity and precipitation after mixing with other 名媛直播, which does not mean that the performance after mixing remains unchanged. The additives added to each product are different and there is a relative balance between them. Once mixed with other substances to break the original balance, the original performance will be lost. Therefore, when changing brake fluid of different brands, be sure to clean the pipeline with the product to be added.
