These brakes came from a 90s Proflex mountain bike and were working properly when they were mounted. Both brakes compressed properly, and there were no obvious leaks that I could see. Unfortunately, I had to snip the rear brake line to get it out of the cable guides so the rear brake is currently not operational (will need to be refitted and bled). There is some normal wear and grime buildup but no other issues that I'm aware of.