Discussion
Which quantity determines the force at a caliper piston?
Answer: C
Force equals pressure times area, so doubling the piston area doubles the clamping force at the same pressure. Pad area affects the pressure on the friction material rather than the total force. Pipe diameter affects response time only. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming what changes and what stays the same is the reliable route through questions of this shape. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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