A mechanic I know turned me onto 3M's Copper Anti-Seize Brake Lube.
can be used for brake systems, o2 sensors and plugs.
p/n: 08945
stuff isn't cheap, $18 for 9oz.
I used to use the CRC synthetic grease, but I tried the 3M stuff & got hooked.
I have 2 tubs of the permatex green, 2 tubs of the CRC synthetic, and also have Raybestos's silicone brake lube.
The rep told me that was the ultimate lubricant, but I wasn't to impressed with it. I used it on 1 car and it seemed fine. But nothing to write home about.
Bendix's ceramalube held up long term.
I've seen sylglide crack & flake off before, I know a lot of shops that use it, I always assumed it was cuz of the price.
Then again, getting a shop to even lubricate anything on a brake setup is like pulling teeth.
I have packets & packets of the mini lubes, most are generic named freebee's from people leaving them and reps and whatnot.
Someday, I'll use them, I'm just to hesitant to break away from the 3M.