GiroDisc A2-155 Rear Brake Rotors – Porsche 991 Turbo / Turbo S (Iron Brakes)

Description

GiroDisc A2-155 – Porsche 911 Turbo/Turbo S (991 Excl PCCB)

Upgrade the rear braking system on your Porsche 911 Turbo / Turbo S (991) with compatible non-PCCB rear brakes with GiroDisc A2-155. This rear iron-brake rotor replacement uses serviceable slotted cast-iron friction rings and lightweight aluminum center hats in a two-piece floating design intended for demanding performance driving.

Vehicle Applications and Fitment

• Porsche 991-generation 911 Turbo with the specified iron rear brake package
• Porsche 991-generation 911 Turbo S only where equipped with the applicable non-PCCB rear brake configuration
• 991.1 versus 991.2 fitment must be confirmed by original brake package

Fitment note: This is an iron-brake application. Do not list it as a direct replacement for PCCB ceramic rear rotors unless GiroDisc specifically confirms that conversion.

Brake System and Installation

Verify application-specific hardware and rotor dimensions before ordering.

Two-Piece Floating Construction

GiroDisc combines slotted cast-iron friction rings with aluminum mounting hats and floating drive hardware. This arrangement accommodates heat-related expansion of the friction ring relative to the hat during repeated braking. The system is serviceable: worn friction rings can be replaced separately when compatible replacement rings are available and the hats remain within service limits.

Cooling and Slotted Friction Surface

Internally ventilated friction rings promote airflow through the rotor under rotation. The slotted contact surface is designed to work with suitable performance brake pads during repeated braking events. Proper ducting, pad selection and brake-fluid maintenance remain important for track use.

Brake Pads and Fluid

Select rear brake pads compatible with the actual Turbo/Turbo S calipers and cast-iron rotors. For track use, choose a brake fluid with a suitable boiling-point specification and follow the vehicle and pad manufacturer’s bedding and service guidance.

Specifications

• Manufacturer: GiroDisc
• Manufacturer part number: A2-155
• Axle: Rear
• Application: Porsche 911 Turbo / Turbo S (991) with compatible non-PCCB rear brakes
• Construction: Two-piece floating
• Friction surface: Slotted cast iron
• Center hats: Aluminum
• Ventilation: Internally ventilated
• Quantity: Left and right pair

Before Ordering

Confirm the original brake package, rotor dimensions, caliper configuration and pad shape. PCCB-equipped and previously modified vehicles may require different components. Contact Demon Speed Motorsports for help confirming fitment. Sold as a left and right rotor pair.