KD sells an inexpensive tool that usually works just fine. It looks almost like square block with square cut outs for a 3/8 extension assorted tips to grab and turn the piston. If it don't work the caliper most likely needs rebuild or replace anyway.

Denn

Sent from my Windows Phone
________________________________
From: Andrew Philbrick
Sent: 11/25/2011 4:21 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Fryday - Mk IV Jetta question.

Just wondering if anyone out there has experience with Mk IV Jetta brake
change.  My parents have a 2000 Jetta VR6 that needs new brakes soon.  The
rear calipers have to be turned while retracting with a special tool.
 Since I don't own the car, I was thinking about renting the tool.

My preferred online dealer for our Mk I Golf has the tool for $45 - (
http://www.germanautoparts.com/Tools/Volkswagen/Brake+tools)  The tool at
the top of the list here.

Our FLAPS has a "universal" tool for rental.  Rental is free but the store
cannot tell me if it works for the Jetta.  Link is as follows -
http://www.oreillyauto.com/site/c/detail/PFM0/W89200.oap?ck=Search_N0675_-1_-1&pt=N0675&ppt=C0067

Just wanted to know if anyone has experience with the rental tool and can
tell me if it fits.

Thanks all,
Andrew