I think I wasn't very clear...
I want to use the Deore calipers = BH90
And the MT447 brake levers = BH59.
Let's say I use a BH59 hose, then I need to use a BH90 barb to make it work with the caliper, right?
If you choose to replace the barb and olive then you'll need BH59 ones (technically only the barb differs, olives are the same), or you can reuse the current barb and olives.
I think I wasn't very clear...
I want to use the Deore calipers = BH90
And the MT447 brake levers = BH59.
Let's say I use a BH59 hose, then I need to use a BH90 barb to make it work with the caliper, right?