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Drum brake systems often use a type of device that automatically
adjusts the drum-to-lining clearance as the shoes' linings wear down.
The three main types of adjustment systems are; cable, link, and
lever. Some systems can operate only when braking in reverse. Others
operate only when braking in the forward direction. Still others
operate when braking in either direction. Older cars used adjusters,
but they were manually adjusted.
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