just replaced the brake switch. what a pain in the #$%. but worth saving a couple hundred bucks from dealer. thanks to these posts i didn't give up after starting, struggling, putting knee panel back on and setting appointment with dealer. these posts convinced me it was doable, so about 90 minutes later I now have brake lights again. After struggling for 30 minutes to disconnect the switch from the bracket, there is No question, easiest thing to do is to disconnect the bracket that houses the switch 1 bolt and use razor knife to carve off prongs holding switch in place. Smooth sailing reassembling everything. although being a double jointed monkey would have helped.
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Pelican Technical Article: BMW Brake Switch Replacement