A Look at New Types of Brake Fluids

The hygroscopic tendencies of several types of motor vehicle brake fluids are compared in both bench tests and in simulated service equipment. The effect of moisture on the boiling point and vapor pressure of some new types of brake fluid are discussed with respect to the specific safety aspects of each fluid. Vapor lock temperature data for conventional and less hygroscopic brake fluids are developed which help to translate laboratory data into information of use to automotive engineers.