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制动液是机动车辆制动系统传递动力的介质，选用和保管是否得当对制动效果有直接的影响。常用的制动液有醇型、合成型和矿油型三种。醇型制动液是由精制蓖麻油和醇类（蓖麻油５７％，乙醇４３％）混合而成，可用于各种液压制动的普通车辆。因乙醇沸点低、易蒸发，故高速汽车、
Braking fluid is a medium that transmits power to the brake system of a motor vehicle. The proper selection and storage of brake fluid have a direct effect on the braking effect. Commonly used brake fluid alcohol type, synthetic and mineral oil type three. Alcohol-based brake fluid is made of refined castor oil and alcohol (castor oil 57%, ethanol 43%) made of a variety of hydraulic brake can be used for ordinary vehicles. Due to the low boiling point of ethanol, easy to evaporate, so high-speed cars,