How often should power steering fluid & brake fluid be flushed?

Guys/Gals, I guess I should have been more specific when I said bike. I meant Mountain Bike. Most manufacturers ship their brake sets as a complete unit.

The brake lever has the master cylinder built in. The brake line goes from the lever to the caliper. They typically come from the manufacturer filled and pre-bled.

They do this because the process of bleeding the brakes can be very finicky. For many manufacturers' brakes, it makes bleeding the brakes on a car seem easy in comparison. Additionally, the only way of getting fluid into the brakes on most brake systems is to open a small bleed port on the brake lever or caliper and inject the fluid using a syringe.

On other systems, the master cylinder has a cap that is screwed down and sealed with an o-ring. Either way, it's completely sealed. I reached out to a bike shop in the UK to see if he ships via royal mail to other countries and he says he ships brand new brake sets (manufacturer pre-bled) all the time.

I'm torn on what to do. Logically speaking, the brakes won't leak unless the box is severely damaged. But is it worth taking the risk?

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