Re: [MBZ] Disc Brakes- Change Pads and Rotors?

[Peter Frederick]

Benz rotors need to be replaced every third pad change (that is, you 
can run two sets of pads on them).  They cannot be turned -- by the 
time you get them smooth, they are almost always too thin, and this 
will cause the pistons to seize in the calipers before the friction 
material is worn out on the older dual piston calipers.  Not good....

Newer models go further, but on the W124 and earlier models, you can 
expect new pads every 30,000 miles or so depending on driving 
conditions and new rotors every 90,000 in the front.  Rears should last 
at least twice as long.

Peter