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A brake band is made of steel, and has a friction lining. One end of
the band is attached a servo actuating rod.
A servo actuating rod is a hydraulic piston (a cylinder with a piston
inside it) that is open at one end to allow oil to flow in. The
piston is normally in the released position because it's kept that
way by a spring. However, when pressurized oil is sent to the
cylinder, the oil forces the piston forward. This causes the brake
band to tighten, and this locks the brake.
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