Discussion
Which adjustment does a disc brake require in service?
Answer: C
The seal rollback mechanism keeps the running clearance constant whatever the pad thickness. Drum brakes need adjustment, which is where the habit comes from. Only the parking brake on a rear caliper may need attention. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first. The shared behaviour explains why these belong together and the differences explain why both exist.
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