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Chamfering is common in the automotive industry. I was led to believe it helped in bedding in pads & reduced brake squeal.
With all due respect and at risk of being blasphemous, may I dare ask this: if chamfering does not help, why did Honda chamfer them? (see pic)
[...]Basic consideration (fulfilled by this design too) is to keep the back of the pad FULLY in contact with the hydraulic piston. This to facilitate consistent pressure across all of the pad from your hydraulic action of pulling the lever.
"Mettalic" pads were the first idea after asbestos was supposedly banned