That is a completely different application. These lifters should oil all the time, the only reason for the disk is to control the amount of oil is allowed to escape the inner chamber. I believe the purpose in a master cylinder would be to act like a check valve. A lifter should never act like a check valve it has a constant flow of oil moving in one direction where as a master cylinders flow goes 2 direction which would be the proper need for a check valve type set up.
