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Sorry, but I don't have any details on the o-rings, as it's been several years since I did the replacements. I think I went with whatever measured slightly larger than the worn originals.
I would use new copper crush washers and a new switch/seal too, even though the plastic switch isn't the "weak link" that someone mentioned. (In a good block, it never sees any pressure, and is not meant to.) But I do think that worn switch internals can lead to a false warning light.
IMO, the biggest problem is getting it free without damaging lines and causing further grief. You might just cut one free in the breaker's yard, and work it over while giving your fittings a good long soak before going at it.
P.S. "but i get concerned about messing around with important stuff like brakes" Two simple o-rings in a part that doesn't even move in normal day-to-day operation? I don't understand what all the dire warnings are about. My guess is that they've never tried it. More complex brake parts are routinely rebuilt.
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Bruce Young '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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