brakes

[jdbubb at ix.netcom.com (Dan Bubb)]

There were two basic dual piston calipers used by Audi in the late 80's early 90's.
The 100, 200 and 5000 used a caliper that mounted on the front of the hub carrier.
The 90 and Coupe used a caliper that mounted on the rear of the hub carrier.
This is significant only because the two pistons in each caliper are not the same size.
The piston on the leading edge of the caliper as the rotor rotates into it should be the smaller
piston and the larger piston should be on the trailing edge. This is to get even pad wear since
gases build up between the rotor and pad towards the trailing edge of the pad and more force is
required there. Hence the somewhat larger piston.
Using calipers that originally were mounted on the rear will reverse the piston sizes with the big
one on the leading edge and probably cause the leading edge of the pad to wear much faster than the
trailing edge.
Is it a real problem? Don't know.
Given a choice I'd get the calipers off the 100/200/5000.
PN 447 615 123 and 124.
Disclaimer: the data above is undoubtedly not all inclusive.
Just some bits and pieces that I'm aware of.
And don't forget to get a 25 mm MC to go with these or you'll lock the brakes without even thinking!
Dan

----- Original Message -----
From: "Marc_Scirocco_Qu?bec" <marc_scirocco@sympatico.ca>
To: "Dan Bubb" <jdbubb@ix.netcom.com>; <fahrvegnugen@cox.net>; "Anthony Pelletier"
<vwnuts@yahoo.com>; <scirocco-l@scirocco.org>
Sent: Wednesday, July 21, 2004 12:03 PM
Subject: RE: Re: brakes


> I think the 20V '90, '91 Audi 90 cs quattro, or the very heavy ones, like
> the late '80s 5000 qattro turbo wagon.
>
> Any pictures, or more details, as this is what I am planning to do for the
> '83.
>
> Cheers.
>
> Marc
> '83 Scirocco
> '97 A4
>
> > -----Message d'origine-----
> > De : scirocco-l-bounces@scirocco.org
> > [mailto:scirocco-l-bounces@scirocco.org]De la part de Dan Bubb
> > Envoy? : mercredi 21 juillet 2004 11:46
> > ? : fahrvegnugen@cox.net; Anthony Pelletier; scirocco-l@scirocco.org
> > Objet : Re: Re: brakes
> >
> >
> > Yes.
> > We were refering to the Audi dual piston calipers that are used
> > on a number of (apparently) high HP
> > Audis.
> >
> >
> > Sent: Wednesday, July 21, 2004 11:19 AM
> > Subject: Re: Re: brakes
> >
> >
> > >
> > > >
> > > > From: "Dan Bubb" <jdbubb@ix.netcom.com>
> > > > Date: 2004/07/21 Wed AM 10:26:43 EDT
> > > > To: "Anthony Pelletier" <vwnuts@yahoo.com>,  <scirocco-l@scirocco.org>
> > > > Subject: Re: brakes
> > > > There may be a dual piston for a 10.1" rotor but just going
> > by the graphics in ETKA (and I
> > checked
> > > > all the models) it doesn't look like it. Anything pictured as
> > a dual piston caliper goes with a
> > > > 276mm rotor.
> > >
> > > Just for clarifications' sake, no VW has dual piston calipers,
> > no road-goiong version.  The only
> > exception to this rule is the TDI Touareg (maybe the V8 also),
> > and the R32...
> > >
> > > Cheers,
> > >    David
> > >
> > >
> > > ---Chrome don't get you home.---
> > >
> >
> >
> > _______________________________________________
> > Scirocco-l mailing list
> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
>