51 Copyright by Goodheart-Willcox Co., Inc. Aft er studying this chapter, you will be able to: • Explain the use of hydraulic pressure in braking systems. • Explain the incompressibility of liquids as the basis of hydraulic system operation. • Describe how movement is transferred by way of liquids. • Explain how cylinder size changes hydraulic force and distance traveled. • Explain Pascal’s law. • Identify the components of a simple brake hydraulic system. • Identify the qualities of brake fl uid and fl uid classifi cations. • Recognize the importance of using the proper brake fl uid. • Describe how to check for various types of fl uid contamination. caliper compressed control valves cylinder Department of Transportation (DOT) electronic brake fl uid tester glycol-based brake fl uid hydraulic actuator hydraulics hygroscopic Pascal’s law silicone-based brake fl uid Society of Automotive Engineers (SAE) solenoid wheel cylinder Hydraulic System Fundamentals Chapter 4 Technical Terms