Hahah. actuall, I just picked up some brake cleaner, a few days ago. Was walking through the aisles of Canadian Tire, and seeing it sitting htere, I swear I reard angels singing.
OMG OLD-SCHOOL CLICHE!
And to settle this once and for all, WD-40, right on the can, advertises that it will clean and lubricate machine parts. Therefore, even if it is not its primary function, it is, indeed, a lubricant.