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MOV'IT Ceramic Brakes for B7-RS4
MOV'IT Ceramic Brakes for B7-RS4 PDF Print E-mail
Written by Paul Rivera   
Thursday, 19 July 2007 16:00

MOV’IT Carbon Fiber Brakes for Audi RS 4 (B6-B7 quattro platforms)

July 20, 2008

By Paul Rivera

Guido Frensemeyer founded MOV’IT Brakes in Achern, Germany, over 13 years ago.

Starting off with Porsche and Brembo Calipers and developing his own Hats and Brackets, he soon discovered there was lots of room for improvement over what he could obtain off the shelf.

As his investment in machines and engineering tools increased over the years, he started development into his own proprietary rotors, and then into his own proprietary BILLET calipers. Guido is a perfectionist, to say the least. I have installed his systems on 2 of my Urq-S4s (C4), my 1991 C3-200 TQA, and my 2005.5 B7-A4 Avant.  I have always been impressed with the quality, as well as the precise and exact engineering of the systems.  As an engineer myself, I am very critical and MOV’IT brakes exceed my expectations consistently. 

Some 5 years ago, Guido launched into his Ceramic Brake development program. After examining the offerings from Porsche, Ferrari, and most recently Audi, he was determined to better them all.

As he had developed his own 6 Pot BILLET Calipers, he had a starting point. According to Guido, ceramic rotors that have been available through Audi and Porsche have several areas that could stand some improvement.

MOV’IT Ceramic Rotors are manufactured in a time consuming and complex process.

Polyacronitrile fiber sheets are woven together to create a PANOX pre-form. 

 MOV’IT rotors are cut out of this pre-form. These "raw" discs are carbonized at >1500°C to convert the Polyacronitrile fibers to carbon fibers.  Now these carbonized rotors are then densified during a 14 day chemical vapor infiltration process, with the result that the rotors are then carbon-carbon.  The rotors are then machined to the final geometry.  Some faces are machined over thickness to allow for future machining process.  High rate silicon infiltration converts the carbon-carbon rotors to a carbon silicon carbide rotor within an approximately 16 hour process.

Finally, all faces are machined to the given tolerances and dimensions using polycrystalline diamond machine tooling which is required due to the hardness of the material.  Finally, a strict x-ray scan and porosity check is followed to ensure the same density throughout the entire rotor.

MOV’IT has developed a variety of Ceramic Rotor sizes for different vehicle applications. 

What are the advantages of Ceramic over Cast Iron Rotors?

First and foremost for any racer or driving enthusiast is to reduce unsprung weight. Ceramic Rotors are at least 45% less in weight, which means saving about 4-8 Kg (8.8 to 17.6 Lbs.) per corner. In the R8, Ceramic Brakes save about 45 pounds of unsprung weight.  That is very substantial.  How many of us have spent way too much money on lightweight wheels, trying to save a few pounds of weight here and there.  By reducing this unsprung weight we sharpen the handling by improving the turn-in, reduce the bump-steer, improve the ride comfort, and a noticeable improvement in the throttle response.

A second important advantage is to have fade free and warp free brakes.  Ceramic Rotors can withstand far more heat and abuse than any cast iron rotor.  This means much lower maintenance for cars that are tracked or driven aggressively coupled with shorter stopping distances. 

Third advantage is a virtual lifetime of longevity for the rotor. Unless you drive over 300,000 miles, you will never be replacing these rotors. Pads yes, but rotors not.  You will most likely be moving this brake system to another vehicle, with only the bracket and hat needing change if you install them on a different platform. 

We are so fortunate to have had the superb B7-RS 4 marketed here in North America. As you may know, when the B7 chassis ended production, so did the RS 4. The B7 based RS 4 Cabriolet has been the last to be available, and now that has ended as well. With only 300 RS 4 Cabriolet examples imported, these will be the rarest and maybe the most sought after in the long term. Either way, the European option of Ceramic Brakes, was never offered here.  Looking at the S8 on the European Audi web site, Ceramic Brakes are a 8,000 ($12,500) option.  

So what is an RS 4 owner, or a B6-B7 A4/S4 owner to do if he wants to upgrade his brakes to Ceramic?

You could order the spare parts through a European Audi dealer (very expensive), or you could have something even better, a MOV’IT Ceramic Brake system.

MOV’IT makes an entire bolt on kit for the RS 4. This is similar to the cast iron system I installed on my B7-A4 Avant.  All required parts are provided including Silicon brake hoses.

The rear brakes are converted to a separate main 4 Pot Caliper and handbrake caliper, just like the R8.

MOV’IT can machine the rear hub carrier for you in an exchange process, or will give you the directions for doing this.  For the most part, the installation is a bolt-on process, and any competent Audi technician can do this-or a tech savvy and mechanically inclined Audi owner.  You should do this on a lift, and use a telescoping support for the rear hub carrier when disassembling and reassembling the rear suspension.

Total installation time is about a half day, not including the machine time for the rear Hub carriers.

When I visited MTM in June of 2008, an RS 4 was in the shop to have the MTM Supercharger installed. The owner was wise to have the MOV’IT Ceramic Brake system already installed, as his 550 Hp was going to make his RS 4 one fast moving projectile, needing superior brakes to arrest his locomotion!

Driving an RS 4 on the Autobahn with the MOV’iT Ceramic Brake system is a revelation for fear free braking.  Every stop was just flat out amazing. When decelerating from over 150 Mph in a panic stop, it was now up to the tires as the weakest link in the chain. This particular car was fitted with some great Michelin Pilots on the Audi optional 20”, and stop it did.

Taking it on some local mountain roads, the reduction of unsprung weight was immediately noticeable.  Flicking the car around the alternating left and right hand hairpin turns as we climbed up in altitude onto the Schwarzwald Hochstrasse (Black Forest Highway), the turn-in as well as the handling in general was just goose bump inducing.

I can whole-heartedly recommend this system for any Audi model that requires the best in brakes.

Guido Frensemeyer can be reached at www.movit.de