You will have to deal with parking brake parts that are located inside the disc and work similarly as a drum type brake.
When I did mine, the hand brake cables and back end plates were badly rusted, so I changed everything. I live where winter salt is used.
Consider replacing brake fluid while you are in there.
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BigBen
'98 E300 Turbodiesel 244 000km
RIP '92 300D 2,5 Turbo 632 859,4km due to engine failure
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