I’ve always known not to use petroleum on rubber, but with that said, I have also always been a LIGHT greaser myself and never in 40+ vehicles have I had an issue. I guess I can add that up to always being a very light coating and always using full synthetic high temp grease... dunno, but I can say I’m sure I’ve done thousands of sets of brakes, mine and others, and never had an issue.

That said I can see how someone may use bearing grease or something petroleum based or cheap and have it “gum up”, you know what I’m talking about, when it gets thick and chunky, I can see that boogering up a caliper slide for sure.


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