GiroDisc 350mm Front Big Brake Upgrade – Porsche 996 Turbo / 4S & 997 Carrera S / 4S

Description

GiroDisc 350mm Front Big Brake Upgrade – Porsche 996 Turbo / 4S & 997 Carrera S / 4S

Upgrade your Porsche’s front braking system with the GiroDisc A1-032A 350mm Big Brake Rotor Upgrade.

Designed for compatible Porsche 996 and 997 models originally equipped with 330mm front iron brake rotors, this system increases the rotor diameter to 350mm while retaining the appropriate factory brake calipers.

The kit includes complete two-piece floating brake rotor assemblies, along with the caliper spacers and longer mounting bolts required to accommodate the larger rotors.

This makes the GiroDisc system an attractive option for Porsche owners looking for improved braking capability without purchasing a complete aftermarket big brake kit.

GiroDisc Part Number: A1-032A

Rotor Diameter: 350mm

Sold as a left and right front pair

330mm to 350mm Big Brake Upgrade

The A1-032A increases the original front rotor diameter from 330mm to 350mm.

The larger rotor provides a greater effective braking radius, increasing braking leverage for a given caliper clamping force. The additional rotor size also provides greater thermal capacity and cooling potential during repeated heavy braking.

This upgrade is especially attractive for Porsche owners participating in track days, driver education events, and other demanding driving activities.

Porsche Applications

The GiroDisc A1-032A is intended for compatible factory iron-brake configurations, including:

• Porsche 996 Carrera 4S
• Porsche 996 Turbo
• Porsche 997 Carrera S
• Porsche 997 Carrera 4S
• Porsche 997 Carrera GTS, where equipped with the applicable brake system

Fitment depends on the original brake package and caliper configuration. Vehicles equipped with PCCB ceramic brakes or modified brake systems may require a different GiroDisc assembly.

Retains the Factory Brake Calipers

Unlike a complete big brake kit requiring replacement calipers, the GiroDisc A1-032A allows the appropriate factory calipers to be retained.

The included spacers reposition the calipers to accommodate the larger 350mm rotor diameter, while the longer mounting bolts complete the installation.

This provides a practical path to larger front rotors without replacing the entire front braking system.

Two-Piece Floating Rotor Construction

Each rotor combines a proprietary GiroDisc cast-iron friction ring with a lightweight center hat machined from 6061-T6 aluminum.

The floating mounting system uses 10 high-strength alloy-steel drive pins to transmit braking forces while allowing controlled movement between the friction ring and aluminum hat.

Class 12.9 mounting screws, hardened washers, and anti-noise spring washers help accommodate thermal expansion while reducing the rattling commonly associated with floating rotor designs.

Curved-Vane Internal Cooling

GiroDisc uses motorsports-inspired curved internal cooling vanes to move air through the rotor as it rotates.

This cooling design, combined with the increased rotor diameter, helps manage the repeated heat loads generated during demanding braking conditions.

Slotted Cast-Iron Friction Rings

The rotors feature a slotted friction surface designed for compatible street-performance and competition brake pads.

The slots help maintain the pad-to-rotor interface during repeated braking and provide an alternative to cross-drilled rotor designs.

Lightweight Aluminum Hats

The 6061-T6 aluminum center hats reduce weight compared with conventional all-iron rotor construction.

Reducing rotating and unsprung weight can benefit suspension response, particularly on track-driven vehicles.

Replaceable Friction Rings

The GiroDisc two-piece design allows worn cast-iron friction rings to be replaced independently of the aluminum center hats.

When the friction rings reach their service limit, the existing GiroDisc hats may be reused if they remain serviceable.

Replacement Front Friction Rings: GiroDisc D1-032

Complete Front Rotor Pair

The kit includes:

• Left front GiroDisc rotor assembly
• Right front GiroDisc rotor assembly
• 350mm slotted cast-iron friction rings
• 6061-T6 aluminum center hats
• Floating rotor mounting hardware
• Application-specific caliper spacers
• Longer caliper mounting bolts

Sold and priced as a complete front pair.

Specifications

• Manufacturer: GiroDisc
• Manufacturer Part Number: A1-032A
• Axle: Front
• Rotor Diameter: 350mm
• Original Rotor Diameter: 330mm on applicable vehicles
• Construction: Two-piece floating
• Friction Rings: Proprietary cast iron
• Center Hats: 6061-T6 aluminum
• Floating Mounting System: 10 high-strength steel drive pins
• Friction Surface: Slotted
• Cooling: Curved internal vanes
• Caliper Spacers: Included
• Longer Mounting Bolts: Included
• Replacement Rings: GiroDisc D1-032
• Quantity: Left and right pair

Important Fitment Information

The GiroDisc A1-032A is a 350mm front rotor upgrade for compatible factory iron-brake configurations.

It should not be assumed to fit every Porsche 996 or 997 model.

Confirm the vehicle’s original front rotor diameter, brake calipers, and wheel clearance before ordering.

PCCB-equipped vehicles may require a different GiroDisc part number. Contact Demon Speed Motorsports for assistance identifying the correct rotor system for your Porsche.