Water Equilibration Studies, Brake Fluids

摘要

The water absorption characteristics of various types of hydraulic brake fluids were studied at controlled humidities. Three series of tests were conducted using a wide scope of brake fluid types exposed to relative humidities ranging from 20% to 80%. Rates and amounts of water absorption were determined. Moisture equilibration percentages were obtained. Boiling point depression was correlated with water concentration. All fluids tested were found to absorb water to varying degrees over the entire humidity range. Boiling points were drastically reduced with only small amounts of water. Fluids equilibrated at one relative humidity were found to desorb water when exposed to a lower humidity. (Author)