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I think the "adverse effects" of having something like WD40 on the brakes are being blown out of proportion.
Right now I have bad axle seals on my F150 and the shoes are oil soaked (for some reason I am resisting tearing into that project). Yes I can tell the difference between oil-soaked and dry when I'm driving it but really the difference is quite small. It stops just fine, and I suspect if I had to stop hard it would do that just fine as well. If someone else drove that truck and they didn't know about the oil I bet they wouldn't even suspect a problem.
I think a big factor is loading. We typically are very lightly loaded when going about the daily grind and the brake system isn't being taxed much. Load heavily and it becomes more of a factor.
Bottom line is IMHO no harm can come from some WD40 or some such on the rotors; it probably burns off pretty quick.
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