[s-cars] Rear Calipers

[Tom Green]

I got it fine, Jack. Sometimes, our readers  digest in haste and miss  
some
of the fine points.  :-)  I think perhaps you put too much initial  
force on the
piston before the turn initiated.  Try leaving the rod just tight  
enough to hold
things in place and the piston rod won't bind up before it starts  
turning.
Then, keep the rod tight enough to keep the tool in place on the piston.
Some newer pistons have a less pronounced detent for the tool, but there
has always been something on mine to engage the tool, perhaps a  
different
end needs to be selected.

The Lucas pub is pretty good.  I couldn't remember where it was  
online, but
maybe 12v.org or similar.  I have it and some other things on the  
piston dis-
assembly but don't have them in pdf, only on paper.  I'll send them  
if I find a
way to scan them.  The difficulty is the circlip holding the spring  
and lower
section to the piston rod.  The piston rotation keeps the parking  
brake cable
adjusted, and that cam assembly needs grease to keep corrosion out  
whether
it is your rebuild or you buy it.  The slide pins and boots need to  
be in good
condition as well.  Those are the usual failure points of the rear  
brakes, not
the caliper pistons.  You may consider new flexible brake lines, too.

There should be plenty of used rear calipers around if you need a set  
for a
core return.  Then you would be free to tinker with rebuilding yours  
without
investing the 100 core charge.  That is a new price increase, so the  
cores
must be in demand now.  Here are some other places to look:

http://www.sjmautotechnik.com/
http://www.autohausaz.com/
http://www.germanautoparts.com/
http://www.fap99.com/

Tom

> Date: Fri, 5 Sep 2008 08:43:06 -0700
> From: "Jack Walker" <jack at walkerperformancegroup.com>
> Subject: Re: [s-cars] Rear Calipers
> To: <S-CAR-List at audifans.com>,	<urq at audifans.com>
> Message-ID: <03fd01c90f6e$17bbe9a0$6402a8c0 at NOTEBOOK>
> Content-Type: text/plain;	charset="iso-8859-7"
>
> Thanks for all the responses, and some terrific advice.
>
>
>
> Since I initially posted, I've found the Lucas publication #XZB137,  
> which
> combined with the advice presented by members of the forums is  
> going to give
> me more than enough confidence to dive into refurbishing the  
> calipers. I
> found ECS has them for like $199 and I would be refunded $100 when  
> I sent
> back my cores. So, in light of this may not be the best price I'll  
> wager I
> can sure buy a lot of seal kits for $99.
>
>
>
> Sorry I guess I didn't make enough note of the fact I WAS using a  
> wind back
> tool to pressure and rotate the piston!
>
> And that the rod that goes through the threaded shaft bent while  
> trying to
> rotate the piston. Current advice is to pressure the piston and  
> rotate the
> piston with a set of channel locks, just haven't done it yet,  
> because my
> channel locks were on my sailboat!
>
>
>
> Interestingly enough one of my 4 caliper's pistons doesn't have any  
> notches
> to engage the wind back tool tabs.
>
>
>
> Jack Walker