I've never owned an automatic before and I need some advice about parking my X5 when I go away for a month. My driveway is on a slope so I park nose up and apply the parking brake. When I last went away I came back to find that I have a pulsing when applying the brakes at high speed. I wonder if the pulsing has to do with leaving a deposit on the rear brakes, I feel the pulsing through the steering as well as the brake pedal.

Two questions:
1. Should I not apply the parking brake, what does this do to the transmission.
2. How do I get rid of the pulsing. I hear I can have the disks ground but that sounds a bit drastic.