Audi 80 (FWD) rear drum to disc conversion...

Ken Keith auditude at
Thu Aug 12 15:54:16 EDT 2004

I have an '88 90 with rear discs here in Arizona that I'm parting out.

I also have rear discs from the same type of car on one of my Coupe
GT's.  I swapped over the whole axle, hub to hub.  I did it for
aesthetics mostly, as I dislike seeing drums behind revealing wheels.

I have to adjust/fine-tune the brake bias toward the front a bit, as
I've discovered that the rears lock up first.  I didn't change the
proportioning valve, but my research at the time indicated it might be
necessary.  One is less linear than the other apparently, and more of
a binary, on/off affair.  If I can't get it dialed in enough, I'll get
into the proportioning valve issue again.

I can't imagine shipping to SA would be cost effective, I heard that
place has some import tariffs and stuff, trying to protect them from
dangerous outside competition.  But let me know if I can help somehow.



gerard gerard at wrote:

someone's considering converting rear drum brakes to discs on his Audi 80 
front-wheel drive machine.

I spent time looking through ETKA trying to figure out what parts can be 
used that could be sourced locally. I'm in a country where the 80/90 is a 
very rare thing.

Some parts are available from the type-44, others need to be bought new, and 
the list's good friend Chris Semple over at Force 5 Auto has good prices on 
some other required parts.

But in all my looking and checking I overlooked the entire rear axle. Ooops.

Seems this needs to be swapped for one from a 80 with rear discs. I 
suspected it, but only noticed it when I finally got pics of the 80's drums. 
There's no mounting or the calipers on the axle.

Short of having to bring a complete rear axle into the country, what can be 
done with this to fit rear discs?

Doh! Typical dumb me.


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