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Rear brakes aren't that complicated. I did a full rebuild of my rear calipers a few weeks ago when I did a 550i rear brake swap to my 535 xdrive. Just unplug and remove the motor, its two torx screws and its all sealed so fluid wont leak out and just use the torx bit to screw the piston in. I've attached a picture of what inside of the mechanism looks like.
**The picture is of the inside of the caliper where the actual piston sits. You will be working on the backside where the motor attaches. This picture is just to show what happens inside when you move the main torx screw, it slides the piston in or out depending on which way you move it, the motor does the same thing when its attached.**
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