DD,

For the 123's at least, it will become a regular DIY maintenance work element to do R&R on the rotors. I mic mine per spec. Some folks just go with one R&R per two sets of front pads.

Check several threads in this forum on How-To, one to which I contributed a little.

Tips I would add:
+ go only with quality rotors
+ if you do the rotors, do the bearings and new seals (ditto quality only)
+ if you do the bearings, do the races (they come with the bearings as a kit)
+ to smack out the old races, go to a metal junk or recycling yard and ask for about a 12 inch long piece of 1/2" diameter round brass stock. Don't use steel (come guys use large screwdrivers), or you might score up the adjacent metal on the hub.
+ use the old race over the new as a tool for tap-tap-tapping in the new race.
+ greasing the bearings is only messy if you make it so. Nitrile gloves and rags, a good knuckle pinch technique, and each can be done in maybe 45 seconds, full up.
+ the big check will be adjusting the bearing tightness. Again, see the threads. Important task. I do it, then check again after two days of driving.

Do the job once and you will have the confidence to go again.

PS. While in there, don't forget to check on all the linkages, leaky boots, damper, etc.

Good luck.

__________________
FRANKNBENZ

1985 300D "Old Blue" 265,000 (parts car )
1985 300D "Gray Ghost" 245,000
1985 300D "Silver Bullet" 160,000
1975 914 VW/Porsche "BC Car" 125,000
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