Now, if you want to stay ahead of the game and ensure the brakes do not fail then do it. Or if you are having doubts about the system. I look at it this way...when I buy a vintage bike I tell myself the brakes have never been rebuilt. So with braking systems 30 - 40 years old it is time. Take a look at what was in the bottom of my front caliper on my KO. Sure, they worked "OK", but time was against them.