i actually just did all of this today.

4. if they have never been changed before, DO IT!!! alot better than wating on the side of the road for a tow truck.
5. do it to!!! brake fluid is hydroscopic, meaning it absorbs moisture(water). generally water and metal do not mix. after a while alot of the parts in the braking system can rust, causing a brake system failure. plus, when the fluid absorbs moisture, its performance is greatly diminished.