The front brakes on these cars (at leas the W123 and W126 etc... not sure about the 201) require the removal of the entire wheel hub, bearings, and such, means you need to put in new seals, repack the bearings with grease, and then reattach the wheel hub to the brake rotor. Not a very fun or easy job. If you know what your doing than its not too hard though....people who've never done brake would would not be in for a pleasant experience...
Edit: Like Ken300D said above 
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