Upgraded brakes are one of the most desirable modifications for the S4/S6. The UrS is a very heavy, very powerful car, which dictates that the car be fitted with very powerful brakes.
I acquired a set of stock Zimmerman rotors (slotted fronts), a set of Kerr Friction endurance racing brake pads, and some ATE Super Blue Brake Fluid from Paul Weston of Weston Motorsports for $499 + shipping. I placed my order late (close to the track date), but Paul made sure everything got to me quickly, so that I would have time to install everything and break-in the pads. Paul was also very helpful during our telephone conversations, answering numerous questions about his products and giving advice about braking systems and brake setup in general.
on the track, the brakes performed flawlessly. They never faded once, ever, even on Turn 1 at TWS (125mph down to 65mph). It's gotta be da shoes, or in this case, the pads that made the difference (I didn't use the ATE SB fluid, but rather an ordinary Castrol product). I was very impressed. Admittedly, the car was on undersized (205), worn, all-season tires, so I'm not sure they would return the same performance with the current sticky ZR 245 width tires. However, I also never dipped into ABS, so there is also still performance to go.
If you are not in the market for big brakes (perhaps for financial or wheel fitment reasons), I would highly recommend looking into this upgrade as an affordable alternative for the track. Note: the racing pads are much too noisy for street use. BTDT.
Jimmy Pribble (Owner/Managing Editor, UrS4.com)
PO Box 2213
Boothwyn, PA 19061
• BIRA (Braking Improvement Research Association) - http://web.archive.org/web/20021019140100/http://www.bira.org/
Uses Porsche Boxster 4-piston monobloc caliper over the 1999 Audi A8 312x25mm rotor. Fits under 16" wheels.
Uses the Porsche 996 Carrera 4-piston monobloc caliper over the European A8 314x30mm rotor. Fits under 16" wheels.
Uses the Porsche 996 Turbo 4-piston monobloc caliper over the Porsche 993tt/GT-3 322x32mm rotor ring. Requires custom (BIRA-supplied) rotor hat.
We also offer "upgrade" brackets for Movit-design owners to replace your old 993tt-based brakes with the new Porsche 996tt monobloc caliper on your existing rotor/hat combination. Install the new Turbo calipers for the price of rebuilding your 993tt older calipers.
Contact Greg Amy at BIRA for details. Complete BIRA kits can be purchased from QRS Motorsport. (QRS Motorsport is in part owned by Jimmy Pribble, the owner of this site).
• BIG REDS - by far, the most popular brake upgrades for the UrS are built around the 2-peice Porsche/Brembo 4-piston, aluminum caliper from the Porsche 993tt. These calipers are commonly referred to as "Big Reds" (BR).
Big Reds peeking out from behind a beautiful Mille Miglia Cup-style wheel.
Brembo/Porsche 993TT “Big Red” 4-piston calipers
322x32 mm Porsche GT2 rotors
mounting brackets, Porsche street compound pads, stainless steel brake lines
Note: Movit now has a kit which includes the new 996tt caliper. Please contact the vendor for more information.
Click on the photos to enlarge the images. Warning! These are large files! They will open in a new browser window.
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fig. 1 - OEM s6 pad & rotor vs. 993tt
fig. 2 - Movit Brackets
fig. 3 - Movit 993tt rotor, custom hat
fig. 4 - 993tt pad left, 996tt pad right, the 996tt is allegedly a couple of percent bigger (78 sq. cm vs. 75 sq. cm) but when you place then face to face, my eyes told me the 993tt had a little more pad area (although the 996tt was taller). Either way, it's about a push.
fig. 5 - Calipers - 996tt monoblock (top) vs. 993tt "Big Red" (bottom)
fig. 6 - 996tt vs. 993tt again. The monoblock is smaller, but the pistons are the same size. Loaded, the 996tt save approx. 1.5 lbs per side. ( 9.5lbs vs. 11lbs for the 993tt)
Dave Jones (719) 471-4103
Brembo/Porsche 993TT “Big Red” 4-piston calipers
314 x 30 mm Zimmerman rotors (drilling or slotting available for free)
steel mounting brackets, Porsche pads, stainless steel brake lines
Note: RevSport also has a kit which utilizes the Audi S8 (323 x 30 mm) rotor and RS2 bracket. Please contact the vendor for more information.
RevSport Kit, AUDI Euro 314 X 30 cross drilled and cad plated (click to enlarge), note wheel stud modification. Photos by Scott Betzold.
They have been tried and tested and it looks like we have a real winner! The laws of physics dictate that this simply won't be the awesome braking of the Move-It kit or the AP kits, but the price is not stratospheric and it WILL work with the stock 16in S4 and S6 wheels....and of course they really do haul the car down in a BIG WAY! :-) Also note that the brakes will work with V8's and 91' 200's that do not have the UFO brakes as long as you have 16in wheels.
Here are the detail, for those of you that don't already know: the kit will consist of 2 brand new Porsche "Big Red" calipers (a.k.a. 993 twin turbo calipers), 2 Zimmerman 314x30 rotors (with your option of drilling, slotting or plain), 2 custom machined caliper brackets (they are steel to avoid and possible problems with cracking or breaking), one set (of four) stainless steel brake lines for the front and rear, one set of Genuine Porsche brake Pads (they have been chosen for the ability to do everything well....stop, low dust, and no noise) and all mounting hardware.
We would like you to have as many options as you see fit for your own personal needs, therefore the kits aren't going to be a stocking item (.I.e. we can't ship the same day you request it). Here's how we visualize this working, you are going to call up and tells us what you want and pay for half of the kit, when we get them in, you will be notified and once the second half is paid for, we will ship that day.
When you order the kits, some of the things that we will need to know are: Do you want slotting, drilling or plain disks? Do you want Cadmium plating on the rotors (an extra $15 per rotor and available in black, silver or gold), do you want to opt for the black calipers instead of the reds (again, it's an additional charge because Porsche actually charges us MORE for the black than the red), maybe you want PFC pads instead of the Porsche pads...who knows. All I am saying here is we want this to be YOUR brake package and no two people are going to have the same taste or opinion on what they want.
Now for the part that you have all been waiting for....what's all this going to cost me? Well, as it stands right now, the entire kit without shipping or installation is going to be $1600.00. Drilling or slotting on the rotors is free or if you want them plain that is an option too (it doesn't cost less, it's just another option). If you are in Colorado, installation is available for $100 and that includes bleeding and flushing the brakes. If you are outside Colorado, count on $30-$40 for shipping (depending on where you are located).