Discussion
Which component retracts a disc brake pad?
Answer: B
The square section seal deflects as the piston moves and its elastic recovery pulls the piston back a fraction of a millimetre. That same action provides automatic adjustment as the pad wears. There is no return spring in a normal caliper. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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