"Responding good" is meaningless.
Pads should be replaced when the 6 month pad inspection
shows them needing to be replaced.
I replaced the front ones on my 06 Specta at 35k miles
and the rears at 45k miles.
I traded in my Sonata with 67000 miles and original pads in good condition.
That is longer than I ever got from my GM cars with similar use and miles.
I'd bet they still had at least 30,000 left on them.
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