Rear pads usually last about twice as long as front pads.

Your parking brake shoes don't need to be replaced, they have plenty of material left. What you need to do is apply them while driving once in a while to wear the crud off. Makes them work better, I do it in all my cars.

MB rotors need to be replaced about every third set of pads -- roughly every 100,000 miles. If you can feel a distinct ridge at the outer edge of the rotor and/or cannot see the "dip" between the machined surface where the pads run and the hub, replace. If you don't, the backing plate will jamb up on the anti-rattle spring when the pads get worn, causing the pads and pistons to cock, sticking the pistons in the bore.

Rotors can be turned, but I would only do so to remove extreme scoring. You must check to make sure they are thick enough, and usually if there is deep scoring and or pitting (mine have been sitting for several years....) they will be too thin as soon as you get them clean.

This is exactly the situation I'm faced with on the 280 -- I now have to replace rotors, pads, AND rebuild the calipers, as the inside piston on both sides are stiff up front, and I expect the rears are shot, too. It's a miracle that the kid driving this thing didn't hit someone, it was almost impossible to stop!

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!