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Pads were the friction material is solely using glue to adhere to the backing plate are generally either very cheap aftermarket replacements or the OEM cheapening out.

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What are they supposed to do? Can you weld them on somehow?

Hooks, holes in the backing plate, stamped/cast dimples, welded wire-mesh for the backing material to adhere to.

Ah, so glue plus mechanical linkage, if that's the phrase?

rivets

This is how it was done for years, they have better adhesives now. In modern cars many of the body panels are affixed with “glue.”

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