I had a quattro shop check it out. The parking brake problem is more that the mechanisms are rusted up on the rear calipers. The left front caliper was also dragging as the wheel was warm from a 20 mile drive. I had seem many parts were NLA on the rear. Shop is recommending a G60 conversion on all 4 corners for hopefully less than $900. BTW I left my car there - let them work on the starter no-crank problem. He's expecting a wiring problem.
steve

Try to get rear brakes from a Urs4. Get the rotors, calipers and carriers.

Then get the rear brake cables from a 4000 and the 4000 E-brake tensioner.

For the front brakes, The UrS4s G60 makes sense.

I just picked up UrS4 rear brakes for 70 bucks for all parts. The 4000 stuff was 20 bucks per cable and the tensioner was found at a junk yard. This makes your 83 alot like the 84s and 85s.

Essentially the entire rear brakes from a 84 4000 isn't that bad a swap for purely economical reasons for a 83 quattro. heck, I think people were getting all the parts for a A8 front/TT rear package for that much on the quattro list.

You'll need the front rotors from a 5kq, not an S4/6. The calipers and carriers are identical. That's what my car came with from the PO, and I did the S4/6 rears. Mine's an '85 so the e-brake hooked up perfectly.

Good luck,
Rich

right that would mean upgrading wheel size to 16" to use the UrS4/6 front brakes.

The S4/6 hub is very different from the 5kq and urq. The offset of the rotor is like 16mm more, well less, more negative. The 5kq front brakes bolt right onto the urq.

Rich

I see what your saying. didn't know that.

Hi James. I'm in a bit of a hurry as I need the parking brake to pass state inspection. SO I'll be getting rotor, caliper and pads new at each corner. Plus labor of course. I do want to stick with 15" rims - so the G60 conversion sounds OK although shop is going to try to give me price for sticking with urq parts - 2 new rear calipers and maybe on front one. Rear rotors are also rusty and pitted a bit. Sounds like with G60 I'll be going to 2 piston calipers.
Left front drags - but I drove the car 100 miles like that without noticing much - so maybe I can postpone that for a few weeks as I don't plan to drive it far.
steve

And if you find them, they're ridiculously expensive for what you get.

Check the part number for the rear calipers on the 90 series cars. I know for a fact that the UrQ and the 20v Coupe share the same rear caliper, because they have identical part numbers for the brake pads. The 90 series is a much more available car, so I would think that the rear calipers would be much easier to come by.

Plus there is part 437 615 422 - housing with brake lever - which is maybe what I need to get parking brake back in order. As far as the later I could see how a shop would hessitate to get into repair if alternate calipers are available cheaply.

steve

I doubt it.

84 and 85 Quattros use the much more common 4000 rear Girlings. It might be the same as the 90.

83 and earlier Quattros use a different girling caliper. Hard to find new.

...and had exactly the same dimensions. Remember, the 20v Coupe also used a lot of the parts from the 4000. The rear suspension on a 20v is pretty much nothing more than a 4000 front suspension flipped backwards. Control arms, ball joints, etc. are nothing more than 4000 pieces.

Especially if the entire 1984 4000 quattro rears are used, its a bolt on.

I hadn't thought about that. The car did have a G60 upgrade, and the documents to show that. But there was no mention, that I recall, of the rear calipers being upgraded.