On the '90 ce, you have to take off the caliper complete with the holding bracket. There is 2 19mm bolts that hold that on. It could be rusted on...Just spray with some good oil and let soak overnight. Use a big hammer from the back side and it will come off. You will not hurt anything. Clean the front of the hub with wire brush and use some anti-sieze compound or grease on it.

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Benzmac:
Donnie Drummonds
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM