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The basic idea behind any hydraulic system is very simple. Force applied at one point is transmitted to another point using an incompressible fluid, almost always an oil of some sort. Most brake systems also multiply the force in the process. The figure below shows the simplest possible hydraulic system :
Simple Hydraulic System
In the above figure, two pistons (shown in red) are fit into two glass cylinders filled with oil (shown in light blue) and connected to one another with an oil-filled pipe. If you apply a downward force to one piston (the left one, in this visual), then the force is transmitted to the second piston through the oil in the pipe.
Since oil is incompressible, the efficiency is very good - almost all the applied force appears at the second piston. The great thing about hydraulic systems is that the pipe connecting the two cylinders can be any length and shape, allowing it to snake through all sorts of components separating the two pistons.
The pipe can also fork, so that one master cylinder can drive more than one slave cylinder if desired, as shown in the figure below.
Master & Slaves Hydraulic System
The other good thing about a hydraulic system is that it makes force multiplication (or division) fairly easy. You might know that trading force for distance is very common in mechanical systems. In a hydraulic system, all you have to do is change the size of one piston and cylinder relative to the other, as shown in the figure below.
Hydraulic Multiplication
To determine the multiplication factor in the above figure, start by looking at the size of the pistons. Assume that the piston on the left is 2 inches (5.08 cm) in diameter, while the piston on the right is 6 inches (15.24 cm) in diameter. The area of the two pistons is Pi * r2. The area of the left piston is therefore 3.14 sq in., while the area of the piston on the right is 28.26 sq in. The piston on the right is nine times larger than the piston on the left. This means that force applied to the left-hand piston will generate nine times the force on the right-hand piston.
So, if you apply a 100-pound downward force to the left piston, a 900-pound upward force will appear on the right. The only catch is that you will have to depress the left piston 9 inches (22.86 cm) to raise the right piston 1 inch (2.54 cm).
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