Review on Wilwood 260 3380 Bore Master Cylinder by Christopher Bacho

Tank o-ring is too large. All attempts to mount the tank ended with the O-ring falling out of the groove. At the same time, in addition to this 3/4" MC, I also ordered a 5/8" and both had the same oversized o-ring. And yes, I warmed up the reservoir before attempting to install it. I have a used Wilwood MC that is many years old and has the correct size o-ring. Hardware store O-rings can be an easy fix for this, but not all O-rings are suitable for use with brake fluid. I sent these Wilwood MCs back and will be ordering a different brand.