What Percent of brake life is 3mm?

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.

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But then, you have to use common sense.

Tester

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Ad-hoc wheel chuck? … lol …