So the caliper i was lubing was a Napa Eclipse replacement i put on 2 years ago for the same reason. my old ones were so pitted in the bores i had to get all new calipers. Now i know, even rebuilt or new, i am going to pull the boots off and check them before installation. We've all seen the comments on Eclipse calipers dropping in quality, 1 out of 4 wasn't too bad, but I should have checked the work first. I rebuilt a set for my mini truck and then found out I can upgrade to bigger calipers, so I am off to the pull-a-part to get started on rebuilding another set. I don't mind it now that i know that they won't stick when i am done. Live and learn.New calipers went in at that point as they were not rebuildable with the corrosion in the piston bores.