rear caliper 4000CS

[Kneale Brownson]

Take a look at   http://www.20v.org/brakere.htm

At 06:53 AM 10/17/2005 -0700, Eric Henning wrote:
>
>My son and I are working on his future 86 4000CS. 
>Right rear disc was very rusty and appears not to be
>acted on by the brakes.  Took the caliper apart
>(removed piston only , not circlip).  I am not familar
>with these types of calipers and see that there is the
>piston, then the part that is threaded on the big rod.
> This part screws out to gain access to the circlip. 
>Is the part that rides on this thread supposed to fit
>inside the piston?  Cleaned everything and put in new
>gaskets but cant seem to get the piston back in far
>enough to fit the pads over the disc.  I've rebuilt
>many calipers before but never saw this type.  What is
>the purpose of this part that threads over the big
>"bolt"?  The other three discs are nice and clean
>indicating that the pads are working, but this right
>rear was completely encrusted in rust telling me no
>pressure was applied to the pads.  What causes this? 
>and should that part that spins on the thread fit
>inside the piston?
>
>Thanks
>
>Eric
>86 4000CS quattro 
>
>
>		
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