Castor oil-alcohol type brake fluid is no longer used, mineral oil type brake fluid has been gradually phased out of synthetic brake fluid, synthetic brake fluid is widely used. It is made of ether, alcohol, ester and other additives mixed with lubricating, anti-oxidation, anti-rust, anti-swelling and other additives. It has a wide operating temperature range, easy to flow at low temperature, flexible braking, high boiling point, low evaporation loss at high temperature, not easy It produces air resistance and is less corrosive to metal parts and rubber parts, so it is widely used.
1. Forklift requirements for brake fluid performance
(1) Good low-temperature performance: If the brake fluid has poor fluidity at low temperature, it is easy to solidify, which will block the pipelines and pumps. When braking, the brake pedal will feel very hard and cannot be stepped on to brake. It is generally required that the brake fluid does not solidify at -40 ° C and flows freely.
(2) Appropriate viscosity: If the viscosity is too large, the fluidity at low temperature will deteriorate, and the braking performance will decrease; if the viscosity is too small, reliable lubrication will not be provided in a high-temperature environment and it will leak easily. In order to ensure that the brake cylinder and rubber cup can slide well, it is required that the brake fluid has an appropriate viscosity.
(3) The boiling point should be high: the forklift truck will move forward and backward frequently in each working cycle, and the brake pads will be in the braking state for a long time, which will increase the temperature of the brake system. The pipes of the local braking system will be filled with steam of brake fluid, resulting in air resistance, causing brake failure. Therefore, it is required that the brake fluid should have a higher boiling point (dry boiling point is the boiling point when the brake fluid does not contain water, and the wet boiling point is the boiling point of the brake fluid containing a certain amount of water), and lower evaporability to reduce the generation of air resistance .
(4) Good corrosion resistance: In order to ensure that long-term use of brake fluid will not corrode metal pipes and components, it is required to add anti-rust agent to brake fluid.
(5) Good chemical stability: The brake fluid is used at high temperature for a long time, and it is required not to cause thermal decomposition and superposition to thicken the oil, nor to allow the formation of sludge sediment.
(6) Little impact on rubber: There are many rubber seals in the brake system. In order not to reduce the mechanical strength and elasticity of rubber seals such as brake cups, it is required that the brake fluid has a small effect on the expansion rate of rubber. In order to avoid the long-term immersion of the brake cup in the brake fluid, the strength, volume and mass will be abnormally changed.
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 first, and after a while, it will feel a little warm, and the brake fluid is not easy to volatilize; Slowly evaporating, it is likely to be fake brake fluid.
(2) Before changing the brake fluid, be sure to clean up the oil, dirt and other places in the brake system fluid port and the bleed screw to prevent the entry of impurities. The brake system should be cleaned in accordance with the provisions of the maintenance manual. It is recommended to use the same type of brake fluid to clean the brake system. It is best not to use alcohol or cleaning agents.
(3) The brake fluid has certain toxicity and cannot be sucked by mouth.
(4) Brake fluid has a destructive effect on the coating on the exterior of the vehicle body, and will cause a “bite of paint”. Therefore, when replacing and refilling, it is necessary to prevent the brake droplets from falling on the coating of the vehicle body.
(5) It is strictly forbidden to mix with other brake fluids. After mixing, there will be turbidity or sedimentation, which will not only greatly reduce the performance of the original brake fluid, but also precipitated particles will block the pipeline and cause serious consequences of brake failure. Even the same type of brake fluid with good compatibility can not be mixed if the brand is different. Because of the good compatibility, it only shows that there is no delamination, turbidity and precipitation after mixing with other 名媛直播. It does not mean that the performance after mixing is unchanged. The additives added to each product are different and there is a relative balance between each other. Mixing other substances to break the original balance will lose the original performance. Therefore, when replacing brake fluids of different brands, be sure to clean the pipeline with the product to be added.
