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I have never disc assembled a hydro disc brake before. They are Shimano deore/ slx. I want to use the cable and ends from the deore and switch them to the slx lever and caliper. Quick Google suggested there was two rubber o rings?
I assume both ends just unscrew?
sacredhart-
Post some pics if you can.
But I think if they’re o rings either side of the banjo connector from a system that was working with no leaks I think they’ll be ok to use again. If it’s a brass olive I always replace those with new ones.
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The official line is you're meant to change the olives (crushable brass washers) every time you disconnect a hose. In reality people often don't bother and a one-time swap ought to be fine. Your risk of course.
Make sure the old and new callipers both use the same style fitting (banjo vs straight).
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I think you're talking about the banjo fitting at the caliper end, reusing the two o rings should be fine if they look OK, reusing olives at the other end is not officially right but generally works fine in practice.
MCamb
grams
snottyotter
Trying to think which o rings you mean.. are you talking about the olive?