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Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://d911api.datadial.net/images/schemaLogo.png https://d911api.datadial.net/images/schemaLogo.png +443456003478 https://d911api.datadial.net Facebook Instagram

DISPLAYING 1 to 3 (of 3 products)
A1-306
Product Information
Product Information
Brake Disc / Rotor Slotted 2-pc FRONT, 
36mm thick


front
Fits:
Porsche 992 GT3 / GT3 RS -  excl. PCCB

Sold/priced per pair.
 
Note:  Stock photography may not depict actual product.

This product is a special order item, allow 5 - 7 working days for delivery.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

A1-306
A1-306
9GT615301B
9GT615301G
9GT615301L
9GT615302B
9GT615302G
9GT615302L

The product you are viewing cross references to these numbers
D2-154S
Product Information
Product Information
Rear replacement brake disc (390mm) - slotted - for cars with PCCB and existing GiroDisc hats.

Includes replacement hardware; the only parts you will reuse are your existing GiroDisc hats.

girodisc

rear
Porsche 981 Cayman GT4 / RS 2016 - w/ PCCB.
--
Porsche 718 (982) Cayman GT4 / RS 2019>> - w/ PCCB.
Porsche 718 (982) Boxster Spyder / RS 2019>> - w/ PCCB.
--
Porsche 991.2 Carrera / S / 4 / 4S / GTS / T 2017-19 - w/ PCCB.
Porsche 991 Turbo / Turbo S / GT2 RS 2014-20 - w/ PCCB.
Porsche 991 GT3 / GT3 RS 2014-21 - w/ PCCB.
--
Porsche 992.1 Carrera S / 4S / GTS 2019-24 - w/ PCCB.
Porsche 992 GT3 / GT3 RS 2021>> - w/ PCCB.

NOTE: This listing is for replacement discs specifically designed for vehicles already equipped with GiroDisc's two-piece rotor system. Please note that this product cannot be used as a standalone upgrade.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

D2-154S
A2-154SL
A2-154SR
A2-156SL
A2-156SR

The product you are viewing cross references to these numbers
D1-154S
Product Information
Product Information
Front replacement brake disc (410mm) - slotted - for cars with PCCB and existing GiroDisc hats.

Includes replacement hardware; the only parts you will reuse are your existing GiroDisc hats.

girodisc

front
Porsche 981 Cayman GT4 / RS 2016 - w/ PCCB.
--
Porsche 718 (982) Cayman GT4 / RS 2019>> - w/ PCCB.
Porsche 718 (982) Boxster Spyder / RS 2019>> - w/ PCCB.
--
Porsche 991.2 Carrera / S / 4 / 4S / GTS / T 2017-19 - w/ PCCB.
Porsche 991 Turbo / Turbo S / GT2 RS 2014-20 - w/ PCCB.
Porsche 991 GT3 / GT3 RS 2014-21 - w/ PCCB.
--
Porsche 992.1 Carrera S / 4S / GTS 2019-24 - w/ PCCB.
Porsche 992 GT3 / GT3 RS 2021>> - w/ PCCB.

NOTE: This listing is for replacement discs specifically designed for vehicles already equipped with GiroDisc's two-piece rotor system. Please note that this product cannot be used as a standalone upgrade.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

D1-154S
A1-154SL
A1-154SR
A1-156SL
A1-156SR

The product you are viewing cross references to these numbers
DISPLAYING 1 to 3 (of 3 products)
About Giro Slotted Brake Disc

Giro Slotted Brake Discs - High-Performance Braking Control & Heat Management

Giro slotted brake discs are engineered for enhanced braking performance, improved heat dissipation, and consistent pedal feel in both performance road and track-focused applications. Featuring precision-machined slots, these discs help clear brake gases, dust, and debris from the pad surface, maintaining optimal contact between pad and disc under demanding driving conditions.

Available from Design911, Giro slotted brake discs offer a balanced solution for drivers seeking improved braking response, reduced fade, and enhanced durability without compromising everyday drivability. Their advanced design supports confident braking during spirited road use and repeated high-load braking scenarios.

What Do Giro Slotted Brake Discs Do?

Giro slotted brake discs work alongside high-quality brake pads to deliver controlled and repeatable stopping power.

Core Functions:

  • Improve heat dissipation during heavy braking.
  • Remove brake gases and debris from the pad surface.
  • Maintain consistent pad contact and braking response.
  • Enhance wet-weather braking performance.
  • Reduce brake fade under repeated high-load use.

The slotted design ensures reliable braking performance across a wide range of driving conditions.

Why Do Brake Discs Wear or Fail?

Brake discs are subject to extreme mechanical and thermal stress over time.

Common Causes of Wear or Failure Include:

  • Thermal cycling leading to cracking or warping.
  • Surface wear from aggressive braking.
  • Heat build-up reducing braking efficiency.
  • Uneven pad deposits causing vibration or judder.
  • Extended service intervals beyond recommended limits.

As discs wear or degrade, braking consistency, pedal feel, and safety are reduced—making replacement essential.

Why Replace with Giro Slotted Brake Discs?

Upgrading to Giro slotted brake discs restores braking performance while enhancing heat management and durability.

Key Benefits:

  • Improved braking consistency and pedal feel.
  • Enhanced resistance to brake fade.
  • Better debris and gas evacuation.
  • Increased confidence during spirited and performance driving.
  • Suitable for performance road cars and track-day builds.

Replacing worn discs with Giro slotted discs ensures braking performance remains predictable and reliable under demanding conditions.

Highlights

  • Precision-machined slotted brake disc design.
  • Enhanced heat dissipation and braking stability.
  • Improved pad bite and consistent response.
  • Suitable for performance road and track use.
  • High-quality construction for long service life.       

Porsche Brake Disc Upgrades: Venting, Drilling, and Grooving Explained

Today we’re talking brake discs: the unsung heroes of your Porsche’s stopping power. What do they do? How can you tell when they need replacing? And what are the upgrade options for enhanced performance? It’s all here. We’ll explore the evolution of brake disc designs, from solid to vented, drilled, and grooved, explaining how each type improves performance. Plus, we’ll break down the materials: durable cast iron, high-carbon steel, and Porsche’s high-performance options like carbon ceramic and surface-coated discs. Whether you’re looking for better braking on the track or a cost-effective daily driving solution, we’ve got you covered.
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