Question 1: Not necessary to replace caliper retainer bolts, but not a bad idea if you're doing major work. Those bolts, if I remember correctly, are coated with a lock compound and probably be reused once or twice. Don't know part #, but any local Benz dealer should have them.
Question 2: Replace the pads. They are broken in to the old rotors and may not seat fully on the new rotors without you doing some driving. You may get uneven brake performance. May even get noisy. They aren't really that expensive and worth the $$ since you've already got the rotors off.
P/S question. Change the filter, if you have one. Why would you be flushing or bleeding. I am not aware of any bleeding procedure for power steering. Maybe someone else has that answer for you. Good luck..
1987 BMW 325
[This message has been edited by jeffsr (edited 03-31-2000).]