Audi V8q vs. A8/S8q rear calipers...

[Bluemaxww1 at aol.com]

Hi,
On a coupe you can do several things in the rear.

UrS4/S6 caliper and carrier 
You can use either a Corrado G60(model) 4X100 rotor or New Beetle 5X100 rotor 
(same as Euro S3).  Both of these rotors are 280X22.  The offset on these 
rotors are a little different.  The Corrado is the closest hat size to the coupe, 
where as the New Beetle is offset a little too far out.

Both rotors need to be machined to fit.  Both rotors need to have the center 
bore enlarged from 65mm to 68mm.  Both rotors need to have the diameters 
machined down to 269mm.  The Corrado rotor needs to be lug drilled to 5X112.  The 
New Beetle rotor needs to have the lug holes slotted to 5X112.

Carriers for the caliper bolted up to the hub carrier on the opposite side of 
the carrier mounts from the way they are standard.  The New Beetle rotor 
requires shimming the carrier outward by about 1.5 to 2mm to center the rotor to 
the caliper.

A8 rear caliper with 269X22 caliper Carrier.
This is the aluminum caliper.  Basically you do the same thing as you would 
have to do with the UrS4/6 caliper and carrier.

S8 rear caliper with 280X22 caliper Carrier.
This caliper is exactly the same as the A8 caliper, but comes with a 
different carrier.  The carrier moves the caliper upward to match the rotor diameter.

You still need one of the two rotors mentioned above. But you can leave off 
the machining of the rotors down to 269.

By the way.  The caliper weighs like nothing compared to the original coupe 
caliper or UrS4 caliper.

Greg

In a message dated 8/3/2004 1:49:15 PM Pacific Daylight Time, 
gerard at 2226.co.za writes:


> Hi!
> 
> It seems up to about 1999 the Audi A8 quattro carried the same 269mm x
> 20mm rear brake discs as the Audi V8 quattro. Then with the S8 and stuff
> like that it became 269mm x 22mm or 280mm x 22mm.
> 
> I have someone looking for S8/A8q rear calipers in order to make use of
> the 280x22mm discs on a S2 fitted with RS2 engine and Porsche 993tt
> front brakes.
> 
> Can anyone tell me how the V8 quattro, A8q (up to 1999), A8q (1999-) and
> S8 rear calipers differ? Apart from the fact that the carrier bracket is
> different in groove size for the disc between 20mm and 22mm thick brake
> setups.
> 
> Part numbers are ofcourse all different, but judging by the fact that my
> current type-44 is running C4 rear calipers, which differ in part number
> but are identical in fitment, there might just be a possibility that the
> parts are interchangable with a slight bit of work.
> 
> And leading on from this... does anyone have some leads on a smashed up
> A8q (or perhaps S8) that is in the process of dismantling?
> 
> Thanks. :)
> 
> G.
>