I'm sure, this has been discussed to death. And, I'll start a flame war. Various people quoting authorities back to Aristotle, and Confuscious.
Which spray lubes do what? I was helping do a brake job, Saturday. The lugs didn't want to come off. The drums rotted to the hub, the rotors rotted to the hub. Bolts that were supposed to hold a bracket over the rotor, rusted.
The folks who own the car were using WD as a lubricant. Try to free drums from hub, and free bolts to come out. Wasn't doing much that I could tell. I've tried Deep Lube, PB Blaster, Kroil, and Castle Thrust. Of those, I recently had a really good result with Castle Thrust (Ion activated!).
I'm in New York State, so we have plenty of rock salt on the roads, and rust is a major issue. What's likely to penetrate and loosen rusted drums, hubs, rotors, lug nuts, bolts, etc?
Christopher A. Young Learn more about Jesus