When I changed the brakes on my 2015 I was looking to replace all the “bits” while I was in there (you may be referring to the thread on that). I couldn’t find anything other than the Babbitt’s parts diagram, which didn’t really help figuring what “should” be replaced, so I just replaced pads.
What I found was that at 24k miles nothing was needed other than cleaning. I sprayed brake cleaner around the pistons and springs, wiped it down and it shined like new. The old retaining springs were still in great shape and cleaned up very well.
I put some brake grease on the pistons, installed the new pads, easy peasy. Runs great.
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