I assume that your Passat is not All Wheel drive. Each Caliper lists for $260 each rotor lists for $70 and a set of good rear pads is $70. It takes about 2 hours to do the, job unless there is a lot of rust and bolts are frozen.
so $750 for parts, which includes some brake fluid and about $180 labor. I have done a lot of VW work, so I feel pretty confident about this estimate.