Discussion
Which symptom does excessive disc runout produce?
Answer: A
A disc running out pushes the pads back and forth, and the driver feels the resulting pressure variation as pulsation. Knock back does lengthen the pedal slightly, so the last option is a genuine secondary effect. Pulsation is the primary complaint. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared behaviour explains why these belong together and the differences explain why both exist. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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