Discussion
Which mechanism adjusts a modern drum brake automatically?
Answer: D
A star wheel and pawl advances a notch when the shoe travel exceeds a threshold, keeping the clearance correct. Handbrake operated and service brake operated versions both exist. Seized adjusters are a common cause of a long pedal. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking which component actually carries the load settles most questions of this kind at once. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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