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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 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
Porsche 911 L / S / T 1965-69 FRONT (Cars with vented disc option)
Porsche 911 1969-83 FRONT
Porsche 930 turbo 3.0ltr 1975-77 FRONT
Porsche 924 1976-85 FRONT 5 stud pattern
Porsche 924 turbo FRONT
Porsche 944 2.5ltr 1982-85 FRONT *Cars without ABS
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
477405083DSL
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
Cross drilled brake discs upgrade for better cooling & braking.
Internally Vented, Perforated, Coated
Outer diameter: 282 mm
Brake Disc Thickness: 20 mm
Bolt Hole Circle Ø: 126 mm
Centering Diameter: 107 mm
Weight: 5.4 kg
Hole Pitch / Number: 5/5
Porsche 911 L / S / T 1965-69 FRONT (Cars with vented disc option)
Porsche 911 1969-83 - FRONT
Porsche 924 1976-85 - FRONT 5 stud pattern
Porsche 924 Turbo - FRONT
Porsche 944 2.5L 1982-85 - FRONT *Cars without ABS
Porsche 930 Turbo 3.0L 1975-77 - FRONT
Please note: Those discs are not sided. They fit left or right side of the car. Brake disc rotors are priced each.
The Zimmermann Sport Brake Disc was developed as a result of experience of brake discs in series-production vehicles in connection with racing. The brake system is optimised by combining high-quality cast materials with a perforated braking surface.
Your advantages:
• Better wet braking performance by permanent expulsion of brake dust and water
• Sporty look
• Because of the anti-corrosion protection Coat Z better finish - especially of the hub and the outer diameter
• Noticeable improvement in the braking power of your car
• Prevention of brake fade
• Countersinking of holes doubles up as wear indicator
• 1:1 exchange of original disc possible
• No additional adaptions necessary
• Not subject to registration: general ABE certification supplied with disc
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
477405083DXZIM
The product you are viewing cross references to these numbers
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944S 2.5L 16V 1987-88
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Brake disc rotor Rear. Porsche 944 / 924S / 924Turbo / 924GT Cars without ABS
Cross drilled brake discs upgrade for better cooling & braking.
Porsche 944 2.5L 1982-85 ** Cars without ABS - REAR
Porsche 944 2.5L 1986-87 ** Cars without ABS - REAR
Porsche 924 S / Turbo / GT ** Cars without ABS - REAR
Porsche 928 >>1985 - REAR
Cross drilled brake discs upgrade for better cooling & braking.
Internally Vented, Perforated, Coated
Outer diameter: 289 mm
Brake Disc Thickness: 20 mm
Bolt Hole Circle Ø: 130 mm
Centering Diameter: 103 mm
Weight: 6.7 kg
Hole Pitch / Number: 10/5
Please note: Those discs are not sided. They fit left or right side of the car. Brake disc rotors are priced each
The Zimmermann Sport Brake Disc was developed as a result of experience of brake discs in series-production vehicles in connection with racing. The brake system is optimised by combining high-quality cast materials with a perforated braking surface.
Your advantages:
• Better wet braking performance by permanent expulsion of brake dust and water
• Sporty look
• Because of the anti-corrosion protection Coat Z better finish - especially of the hub and the outer diameter
• Noticeable improvement in the braking power of your car
• Prevention of brake fade
• Countersinking of holes doubles up as wear indicator
• 1:1 exchange of original disc possible
• No additional adaptions necessary
• Not subject to registration: general ABE certification supplied with disc
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94435204105XZIM
The product you are viewing cross references to these numbers