It's a known problem with knocking brakes on the off rear of B6 passats. To fix, remove the caliper, pull out the top and bottom did pins and half fill with a heavy grease or copper grease into the holes the slide pins slide on, refit and no more noise! Just did mine last week.
I had this retrofit on my Jetta and I was a big fan of it. The unsprung weight complaint I find to be a bit much. As stated above, the weight difference isn't exceptional. The gain here is that you have a greater surface area of clamping force with the addition of an extra caliper piston. Overall, the cost/benefit of this setup is great.
A Mk2 6 line kit will do you just fine here. The Caliper ends up in almost the exact same place as the 9.4 calipers. Ive been runnin Mk2 lines on my 20v car with the Girling 60s for years and theyre not even remotely tight when the car is raised.
Maybe take a look at the Girling 60 calipers and the 11.2 inch rotors from a 'rado g60. Nice large dual piston calipers and 11.2 inch rotors on a mk2 is just about overkill.
For those of you who either have Girling 60 calipers or are thinking about getting them, this post should save you a crap-ton of time. The research here comes from a months-long ordeal which I’ll lay out for you now … Several years ago, I found a pair of Girling 60 calipers off an Audi 5000 at a salvage yard. I was STOKED to put them on my Corrado project, especially since they were a steal at $42 for BOTH. I had them beautifully shot-blasted and powder coated, which of course required that the pistons and seals be removed. As you’re probably all familiar with, other priorities in life took the place of my Corrado project, and the calipers and pistons sat for years. I recently moved from Los Angeles to Austin, TX, and the pistons are nowhere to be found. I had no idea finding caliper pistons would be such an ordeal. I did some research and found the part # s for a few suppliers, and I’m listing them here for your convenience: Centric 143.33014 This is the rebuild kit with new seals and new dust boots for the pistons. Each one will cover one caliper, so you’ll need to buy one for each. The best place to find these is on eBay, where you can get one for around $10. Don't buy the OEM one from germanautoparts unless you enjoy spending $80 for four rubber rings. Centric 117.33025 This is the disc brake hardware kit with new boots for the slide pins. Also available on eBay in the $10 range. Centric 146.40014 or Frenkit P405301 This is the 40mm piston, around $13. Centric 146.45002 or Frenkit P455301 This is the 45mm piston, around $14. Now, from what I can tell—and at least currently—the pistons are nearly impossible to find by themselves. If you look up the part numbers, you’ll find a handful of online retailers that claim to have them 'in stock', but when you put them in your cart, you’ll get a notice that, oops, they’re not actually in stock. OR, you’ll place the order, everything will process wonderfully, and you’ll enjoy euphoria like you just found the Holy Grail of the Last Supper, only to get a phone call the next day from a sales rep to ‘talk about your order,’ a phone call which will almost certainly end with you getting a refund, because you sure as hell aren’t getting the pistons. I even called Centric directly—but they don’t sell to directly to consumers, only to resellers. Centric gave me the name of their biggest client, XL Parts, which is in Texas. I called XL Parts and they don’t have the pistons in stock either. I asked if they could order the pistons from Centric on my behalf … which they COULD … but it would require me physically walking into a store, filling out a form for a special order, and paying for the pistons (and shipping) in advance. For some reason, they don’t take credit cards over the phone. Since I live 3 hours away from the nearest XL Parts location, this wasn’t exactly convenient. So my next step was the local junkyards … where I came up empty-handed. I even tried a send-us-your-part-request-and-we’ll-get-a-network-of-junkyards-to-find-it-for-you service. Four replies, all telling me they had what I needed … only to have them recant once I spoke to them and explained what I was looking for. In the end, I was saved by luck. A Vortexer had a pair of Gilring 60 calipers for sale, but they had a missing carrier and a torn dust boot, so he was willing to sell for a fraction of a full Girling 60 setup. But without something like that, I fear the only places you can get replacement pistons is by getting lucky in a junkyard, or by buying a whole new set of calipers. Or, you can always fly to Houston or Dallas and visit an XL Parts location. Hope this helps some of you. EDIT: For those of you who are being asked "What car is this for?", know that the Girling 60 calipers were used on the following: 1986-1988 Audi 5000 1992-1994 Audi S4 1995-1997 Audi S6 1990-1994 Audi V8 Quattro
The Girling60s weigh an absolute ton, but yield no performance advantage over a G60 setup. IMHO better street config is: - 22mm master cyl. Note that the later cabby MC is not 22mm. However the brake booster can accept one. - Corrado G60-compatible quality 11\" discs - Corrado G60 calipers and carriers - Good pads. I run Hawk HPS myself but there are several good choices - An appropriate set of adapters Personally I have rear discs and adjustable brake bias. I found it necessary to tune the balance after installing bigger, bitey-er brakes, and a heavier engine.
the upgrade really isn't worth it. i have girling 60s with a 23mm MC and 11" rotors on my TDI. the problem is that the booster doesn't seem to keep up, so you need to stomp the pedal to get the bite you want.
