To begin with, let's discuss the different types of brakes and then we can explore the different components. Every rolling vehicle, including trains, tractor-trailer trucks, buses and cars contain one of two types of systems. Hydraulic brakes, found in light-duty trucks and passenger cars, use hydraulic fluid or oil to operate their brakes. Air brakes, which we'll break down in the next section, use air to operate their brakes. Let's look at the differences.
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