I don't know what other cars you've worked on but MBs are different from other cars I've worked on. The front hub has to come off the knuckle so you can get the rotor off the hub. You'll need new rear hub seals for sure and you might as well inspect and repack the wheel bearings. The most difficult part is measurig the proper amount of grease. It's all in the archives. There's also the issue of setting wheel bearing free play by feel or by dial gauge. Many do it by feel.
The rear is easier. The only real complication is when the park brake shoes wear a groove in the drum section of the rear rotor.
The pad thickness sensors should be replaced. The ABS sensors... I don't. I don't know if anyone does.
I wouldn't do a brake job without a proper manual.
Sixto
95 S420
91 300SE
87 300SDL
83 300SD
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