Have you checked to make sure the new lever is not the culprit. Many stories of people not lining the pin up correctly to make sure the plunger into the MC is allowed to return to rest when the lever is let go. Others have had problems with the pin not being machined properly to accept the MC plunger. If the plunger has no free-play or is partially pressed in when the lever is at rest, pressure will stay in the line, and build up with heat from the drag it produces, causing the brakes to eventually bind/lock.
Last edited by rule62; 04-05-2019 at 11:56 PM.