Refer to the information provided in Figure 20.2 below to answer the question(s) that follow. 
Figure 20.2
-Refer to Figure 20.2. the U.S. has
Definitions:
Heat
A form of energy that causes substances to increase in temperature or phase change, often produced by the movement of particles.
Cast Iron
A type of iron-carbon alloy that is noted for its high resistance to wear and its ability to be cast into complex shapes.
Metering Valve
A component in the braking system that regulates the pressure to the brakes, often used in rear to balance braking force.
Proportioning Valve
A valve in a vehicle's braking system that adjusts the pressure between the front and rear brakes, ensuring balanced braking.
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