W123 and W126 front brake rotor replacement, with bearing and pad change included.

The steps:

1. Break loose the lug bolts.
2. Lift and support car with jack stands.
3. Remove wheel.
4. Remove the two 19 MM caliper bolts.
5. Remove the caliper.
6. Remove grease cap on the center of hub.
7. Use a 5mm Allen/hex wrench to loosen the pinch nut on spindle.
8. Remove spindle pinch nut.
9. Thump the rotor brake surface with the heel of your hand to pop loose (be ready to catch) the outer bearing.
10. Slide the rotor off of the spindle.
11. Remove the inner and outer bearing races with a punch and hammer.
12. Clean the grease from inside of the hub.
13. Remove the hub from the rotor with an 8mm Allen/hex. Note: You can use a 3/8 drive to 1/2 inch adapter with a breaker bar + a piece of steel tube for leverage = cheat by fastening the hub to the wheel with 3 bolts plus have someone stand on the inside edge of tire while you break each of the five Allen bolts loose.
14. Cleaned the five removed Allen bolts with a wire brush.
15. Clean off the mounting surface of the hub with sand paper/wire wheel/brake cleaner as required.
16. Position the new rotor on the hub.
17. Put Blue thread lock on the Allen bolts sparingly and install them into hub.
18. Torque the Allen bolts to 80 - 85 pounds.
19. Remove the hub/rotor from the bracing wheel.
20. Use the old bearing race to install/drive-in/seat the new inner and outer race with a hammer and punch, gently but firmly.
21. I suggest you Pack the bearings using a grease gun and bearing packer.
22. Pack the inside of the hub with grease, not too much.
23. Install the inner bearing and wipe grease on the inside/lip of the seal and install the inner seal with a hammer, gently but firmly.
24. Clean the old grease off of the spindle and apply new grease on base of spindle where the seal will ride.
25. Slid the rotor and hub onto the spindle until seated.
26. Install the outer bearing into the hub.
27. Installed the spindle nut.
28. Spin the rotor with light hand pressure, tighten the spindle nut down firmly using channel locks UNTIL the rotor stops moving, then back off nut tension 1/4 turn and tighten the 5 MM pinch bolt.
29. Check for bearing slop/play, smooth spin of the rotor, and binding.
30. Put some grease around the spindle nut and a little inside grease cap.
31. Install the grease cap on the hub.
32. Install the caliper being sure the pistons are fully seated/compressed into their bores.
33. Put some blue thread lock on the caliper bolts, Install and tighten.
34. Remove the old brake pads.
35. Install new brake pads and sensors.
36. Install the front tires, snug the wheel lugs best possible.
37. Lift the car, remove the jack stands and lower.
38. Torque the wheel lugs 85 – 90 ft lb.
39. Get in the car and pump up the brake pedal until firm.
40. Test drive, listening for noise/feeling for vibration or pulling.


Some good Pictures can be found here.
How To Replace Front Rotor W123