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Ur-Q rear brake mod/questions...

In message <199803082154.QAA27844@camel14.mindspring.com> audidudi@mindspring.com (Jeffrey J. Goggin) writes:

> This morning, out of curiosity, I decided to test-fit the 269mm x 20mm
> ventilated rotors and 43mm piston dia. rear calipers to my Ur-Q ... not
> surprisingly, they bolted right up.  I could use them as-is but think it may
> be better to make up a thin spacer (<2mm) that fits between the rotor/hub or
> caliper bracket/strut housing in order to get the caliper perfectly centered
> over the rotor.
> I know Audi used the same size/width rotor on the 20V Ur-Q but can't find
> out what diameter pistons they used in the calipers ... does anyone have any
> input on this?

According to page 00-03 on 000.5147.30.00 it was 43mm, up from 36mm.  They 
also increased the master cylinder to 25.4mm from 23.81mm, and increased the 
brake assist from 3.5:1 to 3.8:1.

 Phil Payne
 UK Audi [ur-]quattro Owners Club