Description
Upgrade the braking performance of your Ford S650 Mustang with GiroDisc 2-piece front brake rotors, engineered as a direct replacement for the factory 390mm 6-piston iron brake rotors. Designed for high-performance street driving and demanding track use, these fully floating 2-piece rotor assemblies reduce unsprung weight and rotating mass while providing improved heat management and durability.
These front rotors are designed for S650 Mustang models equipped with the 390mm 6-piston Brembo iron brake system, including the Mustang GT with the Performance Package, Dark Horse, and Dark Horse SC models that are not equipped with the optional carbon-ceramic brake system.
High-Performance 2-Piece Rotor Construction
The GiroDisc rotor rings are manufactured from a proprietary high-carbon iron casting formulated specifically for high-performance braking applications. The specialized metallurgy provides excellent resistance to heat and repeated heavy braking, helping maintain consistent braking performance during aggressive street driving and track sessions.
The rotor features 72 curved cooling vanes that function as a centrifugal pump, drawing cool air through the center of the rotor and directing it through the internal vanes. This design improves airflow through the disc, helping dissipate heat more efficiently and reduce thermal stress during repeated hard braking.
The fully floating 2-piece construction separates the iron rotor ring from the lightweight aluminum hat. This design helps reduce rotating and unsprung mass while allowing the rotor ring to expand under high temperatures without placing unnecessary stress on the assembly.
Lightweight 6061-T6 Aluminum Hats
Each rotor uses a reusable 6061-T6 aluminum hat finished with a black anodized coating for durability and corrosion resistance. When the rotor rings eventually reach their service limit, the reusable hats can be transferred to replacement rings, reducing long-term replacement costs.
The drive pins are manufactured from a high-strength steel alloy and cadmium plated for improved corrosion resistance. Spring clips and spring washers are used to properly secure the floating assembly, providing race-ready rotor movement while maintaining quiet operation for street use.
Manufactured in the USA
GiroDisc manufactures the major rotor components in-house at its facility in Bellingham, Washington. The hats, rotor rings, and drive pins are produced using domestically sourced materials and assembled to GiroDisc's specifications.
The result is a high-quality replacement brake rotor designed to deliver reliable performance, improved cooling, and durability under demanding braking conditions.
Key Features
- Direct replacement for factory 390mm front iron brake rotors
- Designed for Ford S650 Mustang models with 6-piston Brembo brakes
- Compatible with Mustang GT Performance Package, Dark Horse, and Dark Horse SC
- Not intended for vehicles equipped with optional carbon-ceramic brakes
- Fully floating 2-piece rotor construction
- High-carbon iron rotor rings
- 6061-T6 aluminum hats
- 72 curved cooling vanes
- Improved heat dissipation and brake cooling
- Reduced unsprung weight and rotating mass
- Reusable aluminum hats
- High-strength steel drive pins
- Cadmium-plated drive pins for corrosion resistance
- Spring clips and spring washers for controlled rotor float
- Race-ready design with street-friendly operation
- Manufactured in Bellingham, Washington, using domestically sourced materials
Specifications
- Rotor Type: 2-Piece Fully Floating Front Rotor
- Brake System: 6-Piston Brembo Iron Brakes
- Outer Diameter: 390mm
- Rotor Thickness: 36mm
- Minimum Thickness: 34mm
- Weight: 30.3 lbs per rotor assembly
- Vane Count: 72 Curved Vanes
- Hat Material: 6061-T6 Aluminum
- Rotor Material: High-Carbon Iron
- Finish: Black Anodized Hat
Replacement Rotor Rings
The aluminum hats are reusable when replacing worn rotor rings. GiroDisc recommends replacing the rotor rings when they reach the specified minimum thickness or if a crack develops that extends to the edge of the rotor ring.
Replacement Ring: GiroDisc D1-343
Fitment
- Ford Mustang S650 GT with Performance Package
- Ford Mustang S650 Dark Horse
- Ford Mustang S650 Dark Horse SC
- Vehicles equipped with 390mm 6-piston Brembo iron front brakes
- Excludes models equipped with optional carbon-ceramic brakes
