Coupe GT rear disc conversion, pressure regulator

auditude at auditude at
Mon Jan 27 17:30:50 EST 2003

Ti Kan <ti at> wrote:
> auditude at writes:
> > The cables are cheap, and I'm wondering about the pressure regulator.  One =
> > theory is to take the regulator from the car the axle came from.  From what=
> >  I know, the regulator from the '88 90 is the same as the one on my '86 CGT.
> >
> > The other theory, which I think is the more "right" way to do it, is to use=
> >  the pressure regulator that came on the '87.5 CGT.  This makes the most se=
> > nse since the regulator is probably most associated with the chassis and ve=
> > hicle weight, and less so the axle.
> > ...
> The regulator is adjustable, so it shouldn't matter which unit you use
> as long as it attaches to the axle correctly via the little spring.
> You should adjust it such that the rear brakes do not lock up before
> the fronts.

Hi Ti,

Thanks for the response.  I like that idea, it's inexpensive and keeping with the half-price day(!) axle I picked up.

I'm just curious as to why Audi would have changed the regulator (part number) with the '87.5 CGT.  After all, they changed back to the same part (number) with the '88 90.  Maybe that was a mistake and they should've left it alone?

I want to be practical and pragmatic about this, but at the same time I don't want to skimp on braking philosophy.  Perhaps the regulator is adjustable for height vs. rear brake proportion, but the "rate" of increase is different or something.  I don't know.  I guess I could give it a shot and see what happens.

Yesterday Rob O' from the list and I were in my Coupe GT, and behind us some maniac in a Taurus with a high closing speed locked up his brakes and fishtailed back and forth until he slid to a stop sideways across like 3 lanes of busy freeway.  I was glad he chose that option instead of plowing into us.  Totally nuts.

I guess the Coupe looks like it's going faster than it really is!



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