Discussion
Which noise indicates a wear indicator contacting the disc?
Answer: D
A metal tab contacts the disc when the lining reaches its limit and squeals to warn the driver. Grinding means the warning was ignored and the backplate is now cutting the disc. The two noises mark successive stages. Checking which component actually carries the load settles most questions of this kind at once. Naming what changes and what stays the same is the reliable route through questions of this shape. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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