The "check your brake lining" message popped up on the way down the driveway tonight because it was time for something else to fail since I had fixed everything else.....

It looks like the back pads from what I can tell so Im guessing it has the sensor that dies when the pad wears out and has to be replaced. Do I need two sensors (one for each rear wheel) or is it just one for the back and one for the front on a single side?

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Just BMW's - All cars and trucks was two pages long
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1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
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Aftermarket E53 Radio Install