I have replaced over 10 different master cylinders. I've been a mechanic since high school and a resident engineer doing maintenance on construction equipment. My girlfriend's master cylinder started leaking, I said no problem, went to Orielli, they had it in stock, bought it at Brakebest. During assembly I was careful not to over tighten the threads on the output lines, very hard hand tightening is almost impossible so a wrench was used. I didn't remove the thread, I struggled to start itβ¦