86 4kcsq rear brakes.

["George W. Selby, III" <IsuzuG@prodigy.net>]

Well, I finally heard the grinding noise meaning the end of my rear brakes. 
 I disassembled the brakes and discovered only one bad pad, and a stuck 
guide pin.  I turned the rotors, and fixed the guide pins.  Now the 
problem:  I was anticipating cutting a Sealy cube in half (already had one 
from previous vehicles) but saw a worn out hole in the center of the caiper 
piston.  I remembered from a post a couple of days ago that a 12 mm inside 
hex socket was required.  So I picked one up when I went to get the brake 
pads.  It seems like it wants to fit, but just turns inside the hole 
without spinning the piston.  Any suggestions?

I thought the calipers for my Isuzu truck were made of 24K gold, but I now 
realize they were only gold plated, while the Audi calipers are actually of 
24K gold.  I really don't want to have to buy new ones.

George Selby
78 F-150 400M, 4 on floor, 4x4
86 Audi 4000CS Quattro
IsuzuG@prodigy.net