[s-cars] Re: Big Red Rear Brakes

Tue Oct 21 08:44:31 EDT 2003

Actually Charade is a very particular track because it is never flat. Either
up or down. So very very demanding for the brakes. Stirling Moss said it was
the most beautifull track in the world. Other said it is between
Spa-Francorchamps and Nurburgring. Check www.charade.fr. Michelin is using
it heavily. The week before our event, Porsche was there with a special
Cayenne and Monster Boxster. Both cars ran non stop 2 days and 2 nights.
Pilot/Tires/Brakes were changed every 2 hours.

Regarding the pads, I have no idea because I have not changed them since I
bought the car. But I planning to do it in the near futur. Knowing the
previous owner, there is no reason to be special.

Regards,
Frederic.

>From: "Leigh Anderson" <leigha at teleport.com>
>To: "Frederic L'Huillier" <flhuilli at hotmail.com>,<s-car-list at audifans.com>
>Subject: [s-cars] Re: Big Red Rear Brakes
>Date: Tue, 21 Oct 2003 08:35:29 -0700
>
>Fred,
>
>Don't know the ratios maybe I'll look them up tonight, but the BTDT UrS4
>track car i was referring to has a coil-over full-race suspension.
>
>Must be all that power you have, and late-braking enthusiasm to lose your
>2xBR brakes in 14 laps! or...what kind of pad are you running at track?
>full
>race/hi-temp pad?
>
>Leigh
>----- Original Message -----
>From: "Frederic L'Huillier" <flhuilli at hotmail.com>
>To: <leigha at teleport.com>; <s-car-list at audifans.com>
>Sent: Monday, October 20, 2003 3:05 AM
>Subject: Re: Big Red Rear Brakes
>
>
> > Leigh,
> >
> > Yes they are. I know the suspension upgrade had an positive impact. The
>rear
> > used to dance a bit on the track under hard braking. It doesn't anymore.
> > To give you a comparison. At Charade Race Track, a stock RS4 can do 5-6
>laps
> > maximun. I did 14 before loosing brakes. I am considering installing the
> > brakes ducts of the RS2 on my car for our next track event
> >
> > I don't know the weight distribution between Avant and Sedan so I can't
> > tell. If you have the ratios I will be interested.
> >
> > Frederic
> >
> > >From: "Leigh Anderson" <leigha at teleport.com>
> > >To: "Frederic L'Huillier"
><flhuilli at hotmail.com>,<s-car-list at audifans.com>
> > >Subject: Re: Big Red Rear Brakes
> > >Date: Tue, 21 Oct 2003 00:59:16 -0700
> > >
> > >Hi Fred,
> > >
> > >Are the rear BRs on your beautiful blue V8 S6 avant?  i wonder if
> > >later/more
> > >advanced ESP and more advanced ABS as well as larger contact patch
>(265m!)
> > >have something to do with your better results (vs. early '90's UrS?).
>Also
> > >i
> > >think the Avant has better weight distribution so the rears would have
>more
> > >grip at the contact patch.
> > >
> > >yep,YMMV!
> > >
> > >Leigh
> > >----- Original Message -----
> > >From: "Frederic L'Huillier" <flhuilli at hotmail.com>
> > >To: <leigha at teleport.com>; <s-car-list at audifans.com>
> > >Sent: Sunday, October 19, 2003 11:47 PM
> > >Subject: Re: [s-cars] Re: Big Red Rear Brakes
> > >
> > >
> > > > Hi,
> > > >
> > > > As I have the BR on 4 wheels on my car, I will drop a few words on
>this
> > > > topic:
> > > >
> > > > Yes it does make a difference in term of performance. To a point
>where
>a
> > > > Lotus Elise on track was pretty close to damage my rear bumper ! Jim
> > >Klein
> > > > from California drove my car a few weeks ago and he confirmed it is
>much
> > > > better than just the front BR.
> > > >
> > > > I believe Movit HQ did only one car: Mine. Actually it used to be on
> > >their
> > > > web site under the S4 section. It is not there anymore. The previous
> > >owner
> > > > told me that Movit had to do a lot of work to make the rear BR work
> > > > properly. A lot of parts had to be made for the rear BR. Because the
> > > > previous owner owned a couple of sport car magazines, Movit did it.
>It
> > >would
> > > > have been you or me, they would not have done it ! I have checked
> > >recently
> > > > for other French Audi Club member and received a huge No More !
> > > > I am waiting the estimation of the value of those BRs for my
>insurance.
> > >The
> > > > bill is at least 10000 dollars.
> > > >
> > > > You need a sport suspension to keep up with such brakes system. I
>had
>my
> > > > Bilstein rebuilt to a much harder setup. In term of tires, I do have
> > >265/35
> > > > x 18.
> > > >
> > > > My 0,002 old Francs
> > > >
> > > > Regards,
> > > > Frederic
> > > >
> > > >
> > > > >From: "Leigh Anderson" <leigha at teleport.com>
> > > > >To: <s-car-list at audifans.com>
> > > > >Subject: [s-cars] Re: Big Red Rear Brakes
> > > > >Date: Mon, 20 Oct 2003 10:06:04 -0700
> > > > >
> > > > >Hi Todd,
> > > > >
> > > > >I have a few thoughts, btdt for putting big brakes on back of an
> > >UrS6...
> > > > >I'm skeptical of the performance benefits for such a front-heavy
>car
>as
> > > > >ours, but if motivation is 'cause they look great... thats cool, go
>for
> > >it,
> > > > >being a big brake fanatic myself.  But I just couldn't justify the
> > >expense
> > > > >for myself for functional reasons.
> > > > >
> > > > >btdt/background: For hard braking anywhere/track use especially, i
> > >predict
> > > > >the best setup will be to use a brake bias control and defeat
>almost
> > >all
> > >of
> > > > >the BR rear brake's capability. my BTDT is an UrS4 track car with
> > >mov'it
> > > > >BR's up front (works great and much better than smaller P-car (968)
> > >brakes
> > > > >that PO put on), and P-car brakes on rear (968) installed by PO,
> > >smaller
> > > > >than the 993tt rears, but much bigger than stock UrS rears. When i
> > >tried
> > >a
> > > > >few laps set even 1/3 to rear, it was truly scary/dangerous, the
>car
> > >was
> > > > >skittering/jittering all over, very un-nerving, with lots of
> > >quick-steering
> > > > >inputs to keep it semi-straight and ABS helping as much as it could
>but
> > >not
> > > > >nearly enuf. As soon as i slapped the control back to full-front,
>the
> > >car
> > > > >was rock-solid, much more usable/powerful straight-line braking
> > >resulted.
> > > > >I
> > > > >experimented a few more laps doing a-b testing and came to a firm
> > > > >conclusion, at least for that car.
> > > > >
> > > > >Also note the usual pad life (long) of rear pads vs. front pads
>under
> > > > >street
> > > > >or track condition. My R4S street compound pad lasts a long long
>time
> > >at
> > > > >rear thru street and track use.
> > > > >
> > > > >so my 2cents is... if function is the goal, consider not to do it,
>save
> > > > >money for a more functional perf upgrade.  If aesthetics is the
>goal,
> > >go
> > > > >for
> > > > >it, but most likely expect to be defeating the rears with a
> > > > >brake-positioning valve for safety reasons.
> > > > >
> > > > >pardon if my 2 cents is obvious, as the reference in Todd's post
> > >already
> > > > >says "Some strong words of advice: *-Altering the brake system on
>your
> > >car
> > > > >may be dangerous, and the front/rear brake ratio should be checked
> > >after
> > > > >modifications. A wrong setup results in locking the rear wheels
>prior
> > >of
> > > > >the
> > > > >front wheels which is dangerous. I strongly recommend the
>installation
> > >of
> > > > >an
> > > > >adjustable proportional valve instead of the original one, or at
>least
> > > > >check
> > > > >the front/rear ratio with the stock valve."
> > > > >
> > > > >Cheers,
> > > > >Leigh
> > > > >street car: '92 UrS4 with...
> > > > >    Front: Mov'It BR's, Porterfield R4 pad for track, Porsche
>street
> > >pad
> > > > >(R1
> > > > >slicks for track)
> > > > >    Rear:Audi stock caliper rear, R4S pad for track or street,
>2Bennett
> > > > >drilled rotor (R1 slicks for track)
> > > > >
> > > > >P.S.  note the benefits of <clipped> posting.  I see too many
>unclipped
> > > > >posts, one reason i participate less than in past years... it gets
> > >tiresome
> > > > >'wearing out my scroll button' going through digest emails looking
>for
> > > > >msg#n
> > > > >
> > > > >----- Original Message ----- >
> > > > >Message: 1
> > > > > > From: "TODD KRAMER" <toddekramer at msn.com>
> > > > > > To: <CaptMagu at aol.com>
> > > > > > Cc: "s-car-list" <s-car-list at audifans.com>
> > > > > > Date: Sat, 18 Oct 2003 21:04:40 -0600
> > > > > > Subject: [s-cars] Big Red Rear Brakes
> > > > >
> > > > > > Hap,
> > > > > >
> > > > > > Send me the pic/pics.  I too am so close to a big red rear brake
> > > > >solution
> > > > >t=
> > > > > > hat it isn't funny ... I am simply an emergency brake cable away
> > >from
> > > > >using=
> > > > > >  the actual RS2 setup with the internal Porsche drums.  The
>master
> > > > >cylinder=
> > > > > >  capacity is my only concern, but my techs in Germany assure me
>that
> > >the
> > > > >Ur=
> > > > > > S MC is up to the task.
> > > > > >
> > > > > > My biggest hurdle was the centering disk to keep the 993TT rear
> > >rotor
> > > > >prope=
> > > > > > rly centered, but my OZ Futura's have an integrated removable
>spacer
> > > > >that
> > > > >w=
> > > > > > ill soon be cut to handle the task.
> > > > > >
> > > > > > This old link
> > > > >http://www.s-cars.org/urs4s6/faq/f008/RS2_e-brake/rs2_e-brake=
> > > > > > _4.html has been the inspiration, but I think Joern was using a
>true
> > >Big
> > > > >Re=
> > > > > > d front caliper in his mod.
> > > > > >
> > > > > > .=2E.and now that I hear the Lincoln LS uses and electronic
>acutator
> > >on
> > > > >the=
> > > > > > ir e-brake, the cables may no longer be the long pole in this
>tent.
> > > > > >
> > > > > > Todd Kramer
> > > > > > '95 S6
> > > > >
> > > > >
> > > > >
> > > > >_______________________________________________
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> >
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