That is “Please check my brakes, they just started making a noise on the way here. and don’t try to rip me off!!” type of wear…
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I suppose a brake pad theoretically would “work” with even 1mm of friction material left. Technically a hydraulic brake set up would “work” even with zero friction material, only the coefficient of friction metal to metal is too low to be safe.
But then, you have to use common sense.
Tester
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Ad-hoc wheel chuck? … lol …