I am looking for some addiitonal insights on front brake repair for my 1992 400E (W124).

Some questions:

With the calipers off in the front, will the disk rotor pop off at this point? There is a small Allen-head screw in the rotor roughly between two of the lug bolts. Does it have to be loosened or removed?
This model does not require removal of the wheel bearing and the full hub, right?

I see much more severe wear on the outer pads than the inner pads. Does that possibly indicate the outer caliper/piston is dragging a bit?

Do the sensors and shims come with replacement brake pads? If not, is it recommended to replace those when replacing the pads?

Questions on rotor condition for replacement or resurfacing. The outer surface of my rotor is definitely not flat as you go from ID to OD. There is also a lip right at the OD (probably the pads are just inside that lip). Is there a flatness/roughness guideline for turning or replacing the rotors? What is the dimension? For turning, the rotors need to be more than some minimum thickness? What is the minimum rotor thickness?

Is there any special brake fluid type for Mercedes W124?

Last, I think I made my job a lot harder in trying to remove the calipers. There are 2 19mm Hex bolts to take off. There are also 4 8mm Allen Head bolts that appear to just hold the two halves of the caliper together. I got 3 loosened finally but somewhat damaged the head of the 4th Allen. Can I just retighten the Allen Heads and leave them in place now or is there some resealing to be done?

Finally, is it correct that the pads can be replaced without removing the caliper from the rotor? This will be useful for the future when the rotors do not need work.

Thanks for the help with my long list of questions!

Regards,
Kim

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1992 400E (W124) - 177K Miles - fun car!!