35d brakes and maintenance plan

[wickedwyrm]

Looking for a little insight.

I just bought a 2010 x5 35d CPO with 39k on it yesterday. I was looking through the history and noticed that the brakes had been replaced twice already! Is this typical or did the last driver just use the brakes alot? My last car was a CRV and we put 130k on it and I still haven't changed the brakes. Is the diesel just that heavy that it wears on the brakes that bad?

I'm wondering if I should by the maintenance plan, just so the brakes get replaced for free (if it's going to happen every 15k). I'm planning on towing with this thing also. I completely ignored the salesman on the maintenance plan, but now I'm thinking about getting it. It's my first BMW and I just don't want to get blindsides by crazy maintenance.
Thanks