SPORTS Brake Disc

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>>
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• 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

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