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update: I took the pads down just to be sure that I was right about their remaining life. Turns out they aren't that thin either. I think I could have driven another 10k miles on these pads, especially I am doing 95% hwy.
Still couldn't tell where the noise is from. Many of you commented that the pads are too thin, which turned out to be not the case. I still do not think thin pads (rotor/pin contact) can result in an *inconsistent* noise.
My best bet is loosen/ dirty hardware. my old brake clips are not loosen but they sure have baked on brake dusts.
Since I ordered new pads and hardware, I replaced the old pads and clips anyway, also lubed the pins. So far so good. but the noise problem was its inconsistency. I will see if the noise pops back at some point.
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