I was looking for a DIY, but search didn't return anything.
I was hoping someone who has replaced Routan pads would have resopnded. I don't want to leave you hanging, so I can tell you about the Dodge Journey, which apparently has the same brakes as the Caravan, which are apparently the same as the Routan. So, for what its worth, here is my input as to the Journey:
1. First, the rear brake caliper requires a special tool to push back in the piston. This is very important so you don't break it. It actually screws in. I got the tool from a local parts store as a lender. You should be able to find a local parts store with a loaner set to borrow.
2. If your rotors are warped at all, you must replace them. No turning them, it is only throwing good money after bad. The rear rotors are already too thin, if you turn them they will only warp sooner, much sooner, due to a lack of material to better dispurse the heat. Don't turn them at all if they are not warped. Just clean them up a little and put on new pads. But I am guessing the rotors are bad. Get a good upgrade. A local NAPA had an upgraded version, so they claim.
3. They are otherwise identical to replacing the front pads. If you know how to do front disc brakes, it's identical other than the special tool to turn in the piston. Easy and fast job, not worth paying someone to do.
Now, you should complain to the local dealer. It seems like VW is aware of the problem with the pads/brakes and may do it all for you for free.
Good luck. I am hoping the Routan doesn't have the same brake problems as my old Journey did.
I replaced mine at 60K, just a few months ago. I used Raybestos rotors and pads. So far, so good, but the fronts need replacing now due to warped rotors [not a surprise as they were replaced at 8K and 30K under warranty].
When I replaced the rears, I could not keep the rubber boot from turning with the piston on the right caliper - ended up tearing it and replacing the caliper with a rebuilt unit - bummer. Left side was a breeze.