My bike has Shimano BR M775 brake calipers and BL M775 brake levers. The right lever for the rear brake has a broken screw in the reservoir, so it needs replacement. As BL M775 is no longer available here, my second thought is to get the latest XT levers - M8000.
However after I asked this question about Shimano brake hose compatibility I realize that the newer models use a different type of brake hose (BH 90), with a narrow bore, as opposed to the older BH59 with wide bore.
What does this mean for compatibility - will "narrow bore" levers work properly with older "wide bore" calipers?