Review on Bicycle Connecting Compatible Shimano Hydraulic by Doug Bunkers

I have to say the first olive and insert I used did NOT seat properly resulting in huge oil loss and air ingress. It might have been user error, but with 46 more items to choose from, it just cost me time and swearing. However, this required a complete post-bleeding of the brake in question. But in any case, you need to pump the brakes. So far so good, since after 2 trips it was vented and no visible mineral oil escape from the reservoir. Bonus!