Cheap as I am, I was able to reuse the old wear sensors by carefully extracting them from the old pads. Unless they're worn, there's nothing wrong with reusing the old sensors if you don't break them.

One thing that caught me by surprise that I never encountered on other brake jobs, was that I found that I couldn't fit the caliper over the rotor with new pads - there wasn't enough clearance. The problem was that I didn't clean all the packed-in grit from the pad mounting surfaces of the caliper. Use a wire brush and clean all that grit from the caliper to get the clearance you need.

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95 E320 Cabriolet, 169K