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Are the hose end and 'olive' assembly supposed to be sealed against an o-ring in the housing? I can't see any o-rings now that I've disassembled everything; coming from an engineering background I would expect to see o-rings.
No need. That's what the olive is for.
Good to know thanks.
Nope.
coming from an engineering background I would expect to see o-rings
Why? a well executed olive type joint (as above) doesn't need any additional sealing.
Olive seals onto the hose (insert prevents crush), olive also seals onto both tapers

WHat sort of working pressure does a brake hose see do you think?
....must be a software 'engineer'!
WHat sort of working pressure does a brake hose see do you think?
Probably either: 1) Eek, 2) Ooff or 3) Fuuuuuuuuuuuuuuucckkk
😂