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A booster is a mechanical or vacuum device that is attached to the
master cylinder in power brake systems. The function of the brake
booster is to increase the power and effectiveness of brake systems.
Vacuum boosters tap into the vacuum created by the engine, and use
this to assist braking. In some systems, the booster is connected to
the power steering system. In this case, the power steering pump
supplies pressurized fluid to the booster cylinder. All boosters are
designed to assist braking force from the pedal, not to provide all
of the braking force. This is done as a safety feature in case the
engine quits, cutting off the booster's power supply. Some boosters
use electrical motors to generate their power, which allows them to
remain effective without the engine running.
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