>Better to ensure it is right when purchased than later.

That is a very personal opinion. If I'd followed that advice, I wouldn't have had a bike for the last year and a half. Issues with brakes rate pretty low down on my personal unhappiness meter. And apart from switching to disk brakes, they're not all that expensive to fix.

Much better to get a damn bike, get out there riding, and fix whatever problems actually cause you grief in practice, rather than spend months agonising about potential problems which may not bother you at all on the road.

Steve