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9m Floating Front Brake Disc Upgrade – 350 x 34mm
Sold as a pair
Take the braking performance to
the next level with the 9m Floating Front Brake Disc Upgrade, engineered
for drivers who demand exceptional stopping power, improved heat management and
long-term durability. Designed as a premium replacement for the factory front
brake discs, this two-piece floating slotted brake disc assembly combines
advanced materials with precision engineering to deliver consistent braking
performance on both road and track.
Fits:
- Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
- Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
- Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
- Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
- Porsche Cayman S 718 2.5L Manual (350 Bhp)
- Porsche Cayman S 718 2.5L PDK (350 Bhp)
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
Each assembly consists of a CNC-machined aluminium hat paired with a high-carbon alloy cast iron floating rotor ring, reducing unsprung weight while allowing the braking surface to expand and contract naturally under extreme temperatures. This floating design helps minimise stress, reduces the risk of disc distortion and maintains a more consistent pedal feel during repeated heavy braking.
Manufactured using CM-250 formulated high-carbon alloy cast iron, the rotor rings are heat treated to relieve internal stresses before machining, improving strength, stability and resistance to cracking or vibration. Combined with 72 precision-engineered internal cooling vanes, these discs deliver outstanding thermal efficiency, allowing heat to dissipate rapidly and helping maintain braking performance under sustained high-load conditions.
The result is a brake disc package that offers exceptional reliability, improved driver confidence and the performance expected from a Porsche developed for enthusiastic road driving and occasional circuit use.
What Does a Two-Piece Floating Brake Disc Do?
A floating brake disc separates the braking surface from the mounting hat, allowing each component to perform its specific function more efficiently.
Key advantages include:
- Allows the rotor ring to expand independently during heavy braking.
- Reduces thermal stress transferred into the hub assembly.
- Minimises the risk of brake judder and disc distortion.
- Improves heat dissipation.
- Reduces unsprung weight.
- Delivers more consistent pedal feel.
- Enhances braking performance during repeated high-speed stops.
Compared with conventional one-piece brake discs, floating assemblies provide improved thermal management and greater durability under demanding driving conditions.
Why Upgrade to the 9m Floating Brake Disc Assembly?
The 9m floating brake disc upgrade has been developed using premium materials and precision manufacturing processes to maximise braking efficiency.
Benefits include:
- Two-piece floating brake disc design.
- Slotted braking surface for improved pad cleaning and gas evacuation.
- 72 internal cooling vanes for exceptional airflow.
- CM-250 formulated high-carbon cast iron rotor rings.
- Heat-treated rotors to reduce internal stresses.
- CNC-machined 6061-T6 aluminium hats.
- Hard anodised hat assemblies for corrosion resistance.
- Reduced unsprung weight.
- Improved resistance to thermal distortion.
- Consistent braking performance under repeated heavy use.
- Ideal for spirited road driving, fast road builds and track days.
Premium Engineering
Every component has been carefully engineered to deliver exceptional durability and performance.
Rotor Rings
The rotor rings are manufactured from CM-250 high-carbon
alloy cast iron, providing:
- Outstanding high-temperature strength.
- Excellent wear resistance.
- Improved thermal stability.
- Enhanced braking consistency.
- Long service life.
Following casting, each rotor is heat treated to relieve internal stress, helping prevent deformation and vibration throughout its operating life.
Aluminium Hat Assemblies
The centre hats are precision CNC machined from 6061-T6 aluminium before receiving a durable hard anodised finish.
Benefits include:
- Lightweight construction.
- Excellent dimensional accuracy.
- Corrosion resistance.
- Reduced unsprung mass.
- High structural rigidity.
Slotted Brake Disc Design
The precision-machined slots help maintain optimum braking
performance by:
- Clearing brake dust from the pad surface.
- Allowing gases generated under heavy braking to escape.
- Maintaining consistent pad contact.
- Improving wet-weather braking response.
- Enhancing pedal consistency.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9M71825GTS
The product you are viewing cross references to these numbers
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Fits:
Porsche 993 Turbo
Kit Contains:
Brake Disc complete with centre bell.
Brake Disc Type: 2-Piece Drilled & Slotted
The Girodisc brake rotor is a direct replacement for the OE discs, and provides significant performance benefits. The rotors are compatible with any of the current pads typically used with these cars.
Additional information:
Braking Performance: The rotor is a two-piece design developed in racing to produce a lightweight rotor that can compensate for the different expansion rates between the hat and rotor and eliminate the possibility of rotor warping.
The rotor and hat have a floating mount system, which utilizes 10 high strength alloy steel drive pins, which allows for axial and radial float.
More heat sink without a weight penalty: The Girodisc disc set weights in a little lighter than the OE system but with an important advantage. The rotors have grown in diameter. This means that weight has been transferred from the center hat were it does nothing to the outer diameter where it is actively absorbing and dispersing heat.
High Quality Materials: The Girodisc system uses only the highest quality materials and components. The rotors are high carbon content iron for long wear and stable thermal performance. The top hat section is machined from billet aluminum with an attractive anodized finish.
This product is a special order item, allow 5 - 7 working days for delivery.
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Fits:
Porsche 993 Turbo
Porsche 993 C4S
Porsche 993 RS
Kit Contains:
Brake Disc complete with centre bell.
Brake Disc Type: 2-Piece Slotted
The Girodisc brake rotor is a direct replacement for the OE discs, and provides significant performance benefits. The rotors are compatible with any of the current pads typically used with these cars.
Additional information:
Braking Performance: The rotor is a two-piece design developed in racing to produce a lightweight rotor that can compensate for the different expansion rates between the hat and rotor and eliminate the possibility of rotor warping.
The rotor and hat have a floating mount system, which utilizes 10 high strength alloy steel drive pins, which allows for axial and radial float.
More heat sink without a weight penalty: The Girodisc disc set weights in a little lighter than the OE system but with an important advantage. The rotors have grown in diameter. This means that weight has been transferred from the center hat were it does nothing to the outer diameter where it is actively absorbing and dispersing heat.
High Quality Materials: The Girodisc system uses only the highest quality materials and components. The rotors are high carbon content iron for long wear and stable thermal performance. The top hat section is machined from billet aluminum with an attractive anodized finish.
This product is a special order item, allow 5 - 7 working days for delivery.
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
Vented, Perforated, Two-piece floating brake disc, Coated
Outer diameter: 322 mm
Brake Disc Thickness: 32 mm
Bolt Hole Circle Ø: 130 mm
Centering Diameter: 103 mm
Porsche 911 (993) Turbo / Turbo Look 1994-98 - FRONT
The Zimmermann Formula Z brake disc was designed with the aim of teaming simple installation with optimum braking effect under high mechanical and thermal load.
The compound brake disc developed by Zimmermann accommodates the increased demands incurred by engine tuning and optimised chassis structures.
Your advantages:
• Excellent deceleration action and no distortion of friction ring at high temperatures
• Substantial weight saving and therefore less unsprung mass
• Floating mounting enables radial expansion of the brake disc under relatively heavy loads, thus preventing shielding and increasing resistance to heat cracks
• „Hot spots" prevented by optimised design of ventilation channels
• 1:1 exchange of original disc possible
• Not subject to registration: general ABE certification supplied with disc
• No conversion required for brake tuning
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99335104
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C2S 1994-97
Thickness: 32mm
Diameter: 304mm
Porsche 911 (993) C2 / C4 / C2S 1994-98 - FRONT
Brake disc rotors are priced each.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99335104
The product you are viewing cross references to these numbers