Interesting....I've always used the caplier lube on the pins, without any issues. The stuff I use says that's it meant be be used on the pad contact points, backing shims and slider pins. On my 2nd brake job on the Sienna, the slider pins were still very easy to move. I just did that brake job about a month ago and lubed the pins. If I get some time here soon I may yank a caliper and check it out. I'll post back when I do.