[s-cars] Re: Big Red Rear Brakes

Mon Oct 20 07:47:09 EDT 2003

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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