Looking on eBay, wanting to avoid poor quality (cheap multi packs), some are more expensive and described as steel - is this a sensible choice or snake oil?
Second question, is it an accepted practice to use anti seize eg copper slip, or is that a risk for brake fluid contamination?
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Personally I don't use any compounds on brake threads. I have used ptfe tape (like plumber's use) because I find that stops any by-pass down the threads when bleeding, but it's not a big deal. I can't see any reason not to use copper slip though, it's on the back end of the system and providing it's only on the threads I'd expect it's unlikely to migrate into the caliper against fluid pressure.
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Bleed screws originally would probably have been made in 1A steel - cheap. Stainless would definitely not be suitable as too hard. The bleed screw should deform before the bleed port seat.
These days there are obviously different types, but generally "copper slip" would be mineral based and definitely not suitable.
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