Brake Rotors

Discovery Parts is an Authorized dealer for GiroDisc products and we are one of the largest stocking dealers in the country. We ship most products same or next business day to ensure we meet your delivery deadline. Fits Porsche 991 GT3 Cup Car (Rear) The GiroDisc system is an upgrade to a 2-piece steel rotor and aluminum hat combination and is a direct replacement for the OEM brake disc. The 2-piece floating disc will bolt directly to the car and work with OEM calipers perfectly. By upgrading your brakes with these lightweight high-performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. The Giro Disc rotors are lighter than OEM pieces. The reduction in rotational and unsprung weight (approx. 8 lbs) allows for quicker acceleration and suspension response. When used with Pagid or PFC performance brake pads, and Discovery Parts RF-1 brake fluid (also available from CompetitionMotorsport.com), you have an amazing solution to overheating, cracking and warping rotors. The central hat section of the disc is made from 6061-T6 aircraft specification aluminum. The disc is manufactured from cast iron which is constructed in the USA and is made to the same specification with the same material used by professional racing organizations. The rotors curved vane design was developed in racing and acts as a centrifugal pump to force cooling air through the disc. The rotor and hat mount together through a floating mount system which utilizes 8-10 high strength alloy steel drive pins manufactured by GiroDisc in the USA to our own specifications and are cadmium plated for corrosion resistance. The alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat. The pins are secured by grade12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The 2-piece GiroDisc design allows for rotor only replacement as well to minimize future replacement costs and deliver outstanding performance and cooling. Sold/Priced per pair.

Discovery Parts is an authorized dealer for Girodisc products. As one of the largest stocking dealers in the country, we ship most Girodisc products the same or next business day to ensure we meet your delivery deadline. Fits Chevrolet Camaro ZL1 Gen 5 The Girodisc system is a direct replacement for the OE disc, they will bolt directly to the car and work with OE calipers perfectly. By upgrading your brakes with lightweight high performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. The central hat section of the Girodisc rotor is made from strictly USA-sourced 6061-T6 aircraft specification aluminum. The disc is made from Girodisc's own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc. The rotor utilizes a curved-vane design, developed in racing to act as a centrifugal pump forcing cool air through the disc. The disc and hat have a floating mount system, which utilizes 12 high-strength alloy steel drive pins, manufactured in the US by Girodisc and cadmium plated for long-lasting corrosion resistance. These pins take the loads from braking while maintaining the axial and radial float between the hat and disc. They are secured by class 12.9 cap screws and hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise springs on the disc side, allowing the iron disc to expand as it heats up while eliminating the rattle and noise commonly associated with floating rotors. This float also allows the rotor to self center between the brake pads. Once the Girodisc system is in place, you simply replace the cast iron discs when needed. This reduces cost over time by allowing you to re-use the aluminum central hats. Sold/priced per pair

Discovery Parts is an Authorized dealer for GiroDisc products and we are one of the largest stocking dealers in the country. We ship most products same or next business day to ensure we meet your delivery deadline. Fits Corvette C8 The GiroDisc system is a direct replacement for the OEM brake disc. The 2-piece floating disc will bolt directly to the car and work with OEM calipers perfectly. By upgrading your brakes with these lightweight high-performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. The Giro Disc rotors are lighter than OEM pieces. The reduction in rotational and unsprung weight allows for quicker acceleration and suspension response. When used with Pagid or PFC performance brake pads, and Discovery Parts RF-1 brake fluid (also available from CompetitionMotorsport.com), you have an amazing solution to overheating, cracking and warping rotors. The central hat section of the disc is made from 6061-T6 aircraft specification aluminum. The disc is manufactured from cast iron which is constructed in the USA and is made to the same specification with the same material used by professional racing organizations. The rotors curved vane design was developed in racing and acts as a centrifugal pump to force cooling air through the disc. The rotor and hat mount together through a floating mount system which utilizes 8-10 high strength alloy steel drive pins manufactured by GiroDisc in the USA to our own specifications and are cadmium plated for corrosion resistance. The alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat. The pins are secured by grade12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The 2-piece GiroDisc design allows for rotor only replacement as well to minimize future replacement costs and deliver outstanding performance and cooling. Sold/Priced per pair.

This Girodisc system is a 380mm two-piece steel rotor and aluminum hat combination, a direct-replacement upgrade for the one-piece OEM GT4 Clubsport steel brakes. The A2-266 will bolt directly to the GT4 ClubSport and work perfectly with your OEM calipers. There are two main reasons for replacing your OEM rotors: first, the Girodisc rotors are designed to shed heat more effectively than the original rotors; second, the slotted Girodisc A2-266 will far outlast the OEM drilled rotors. When subjected to intense heat in a racing or track-day environment, the drilled holes in the OEM rotors originate cracks which can lead to rotor failure. When paired with the Girodisc A1-266 front rotors, your factory brake bias and ABS efficiency are maintained. When used with Pagid or PFC performance brake pads, and Discovery Parts RF1 brake fluid (also available from CompetitionMotorsport.com), you have an amazing solution to overheating, cracking and warping rotors. The central hat section of the disc is made from 6061-T6 aircraft specification aluminum. The disc is manufactured from cast iron which is constructed in the USA and is made to the same specification with the same material used by professional racing organizations. The rotors curved vane design was developed in racing and acts as a centrifugal pump to force cooling air through the disc. The rotor and hat mount together through a floating mount system which utilizes eight to ten high strength alloy steel drive pins manufactured by Girodisc in the USA to our own specifications and are cadmium plated for corrosion resistance. The alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat. The pins are secured by Grade 12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The two-piece Girodisc design allows for rotor only replacement as well to minimize future replacement costs and deliver outstanding performance and cooling. Sold/priced per pair.

FITS PORSCHE 911 GT3/GT3RS/GT2RS (2021+) REAR WITH STEEL BRAKES The Girodisc system is a direct replacement for the OE disc on the 992 GT3, GT3RS, and GT2RS with OEM iron rotors. No modifications are necessary, allows use of factory unmodified pads unlike most aftermarket solutions for this application. The disc will bolt directly to the car and work with OE calipers perfectly. By upgrading your brakes with lightweight, high performance replacements -- as opposed to a big brake kit -- your factory brake bias and ABS efficiency are preserved.The central hat section of our rotor is made from strictly USA-sourced 6061-T6 aircraft specification aluminum. The rotor is made from Girodisc's own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc. The rotor utilizes a curved vane design, developed in racing to act as a centrifugal pump to force cooling air through the disc.The rotor and hat have a floating mount system, which utilizes 12 high strength alloy steel drive pins, manufactured by Girodisc in the USA to their own specifications and cadmium plated for long-lasting corrosion resistance. These pins take the load from braking while maintaining the axial and radial float between the hat and disc. The pins are secured by Class 12.9 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers on the rotor side which allow the rotor to grow with heat expansion, eliminating the rattle and noise commonly associated with floating rotors. This float also allows the rotor to self center between the pads.Once the Girodisc system is in place, simply replace the cast iron rotor ring when needed.When used with Pagid or PFC racing brake pads and hi-temp RF1 racing brake fluid, you have what amounts to a truly amazing solution to overheating or warping rotors.If your car same with OEM center lock wheels please select the center lock drive pin option.Sold/priced in pairs.

Discovery Parts is an Authorized dealer for GiroDisc products and we are one of the largest stocking dealers in the country. We ship most products same or next business day to ensure we meet your delivery deadline. Fits Tesla Plaid Rear Only The GiroDisc system is a direct replacement for the OEM brake disc. The 2-piece floating disc will bolt directly to the car and work with OEM calipers perfectly. By upgrading your brakes with these lightweight high-performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. The Giro Disc rotors are lighter than OEM pieces. The reduction in rotational and unsprung weight allows for quicker acceleration and suspension response. When used with Pagid or PFC performance brake pads, and Discovery Parts RF-1 brake fluid (also available from CompetitionMotorsport.com), you have an amazing solution to overheating, cracking and warping rotors. The central hat section of the disc is made from 6061-T6 aircraft specification aluminum. The disc is manufactured from cast iron which is constructed in the USA and is made to the same specification with the same material used by professional racing organizations. The rotors curved vane design was developed in racing and acts as a centrifugal pump to force cooling air through the disc. The rotor and hat mount together through a floating mount system which utilizes 8-10 high strength alloy steel drive pins manufactured by GiroDisc in the USA to our own specifications and are cadmium plated for corrosion resistance. The alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat. The pins are secured by grade12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The 2-piece GiroDisc design allows for rotor only replacement as well to minimize future replacement costs and deliver outstanding performance and cooling. Sold/Priced per pair.

Discovery Parts is an authorized dealer for Girodisc products and one of the largest stocking dealers in the country. We ship most products same or next business day to ensure we meet your delivery deadline.   These GiroDisc 2-piece rotors are designed as direct replacements for the rear rotors found on the G80 M3, G82/83 M4, and G87 M2 models without carbon ceramic brakes. Featuring fully floating assemblies, they effectively reduce unsprung weight and rotating mass from the vehicle's axle. The rotor rings are precision-machined from a proprietary casting of high-carbon iron formulated to GiroDisc’s exact specifications. This advanced metallurgical composition ensures superior durability, while the 48 curved vanes function as a centrifugal pump, drawing air through the hub to efficiently cool the rotors during demanding conditions. The 2-piece design incorporates a reusable hat, allowing easy attachment to new rings (part number D2-282) when replacement is necessary. All key components, including hats, rotor rings, and drive pins, are manufactured in-house at our Bellingham, WA facility using domestically sourced materials. The hat is crafted from 6061-T6 aluminum and features a durable black anodized finish. Drive pins are made from a high-strength steel alloy and coated with cadmium for enhanced corrosion resistance. Rotors are assembled with spring clips and Belleville washers to ensure optimal float for racing applications, while maintaining quiet operation on the street without the risk of loose hardware. We recommend replacing the rotor rings when they reach a minimum thickness of 22mm or if a crack extends to the edge of the ring. These rotors are sold and priced per pair.

AP Racing 12-Bolt, Floating Hat, Disc Attachment Hardware Kit AP Racing rotor disc attachment hardware kit for AP Racing floating hat, two-piece discs. This kit includes 12 bolts, 12 nuts and 24 washers and does one rotor ring. AP Racing 12-Bolt, Floating Hat, Disc Attachment Hardware Kit Details: Manufacturer: AP Racing Manufacturer US part number: AP-13.04.40003 Bolts: 12 Nuts: 12 Washers: 24 Torque: 10 foot lbs. / 124 inch lbs

AP Racing 372x34mm Replacement Ring AP Racing replacement 372x34mm J Hook rotor discs are used in many of the AP Racing brake kits. These replacement rotor ring measures 372mm x 34mm and features 72 directional cooling vanes. The AP Racing 13.05.10052 and 13.05.10053 rotor rings are directional, curved vane, heat treated and stress relieved. These are the exact AP Racing  rotor rings as CP7177-350GC and CP7177-351GC with the USA AP 13.05.10052 and 13.05.10053 part numbers. Same rings, different part part numbers. AP Racing J Hook Competition Disc Replacement Ring 372x34mm Details: Manufacturer: AP Racing Manufacturer US part number right: AP-13.05.10052 AP Racing part number right: CP7177-350GC Manufacturer US part number left: AP-13.05.10053 AP Racing part number left: CP7177-351GC Slotted face: Yes Diameter: 372mm (11.65") Thickness: 34mm (1.34") Hardware included: No Torque specs for this disc and hardware assembly: 124 lb-in Iron Disc Benefits So what can AP Racing J Hook iron discs do for a car previously equipped with carbon ceramic discs? Increased airflow and slower heat transfer to other brake components- AP Racing J Hook discs have a unique, high-count vane design that promotes airflow, heat evacuation, and rapid cooling. They don't rely on a large surface area to cool via radiation. The iron discs will move more air than your carbon ceramic's, and as a result they won't heat your brake pads, caliper pistons, and brake fluid up as quickly. You'll be able to run longer sessions without brake fade, and you'll enjoy the confidence that comes along with them. They'll also make any brake ducts that you have on the car more effective and useful. Huge range of compatible brake pad compounds- Iron discs will open up a much greater range of available brake pads. You'll be able to achieve a different feel, and tailor your brake setup depending on your needs and environment, whether that is running an AutoX or the most demanding racetrack in your area. You'll also likely be paying less per brake pad set than you were previously, and your pads will last longer. Inexpensive spare discs- You'll no longer have to spend thousands of dollars when it's time to replace your discs. AP Racing J Hook's typically only cost $400-600 per iron disc ring, so you won't have to stress about anything happening to them. They're inexpensive enough that you can always keep a spare set on hand, so you won't have to worry about any brake-related downtime when you're out at the track. Durability- Iron discs can take a beating. You can stash your spares in your race trailer, and you won't have to worry about handling them, covering them, dinging them, or chipping them when changing your wheels. As you can see, although iron discs do come with a slight weight penalty, they're still the smart choice if you run your car hard on the racetrack. They're the obvious solution that has been proven countless times on tracks around the world, at all levels of motorsport. Among iron disc choices, there are none better than AP Racing J Hooks. AP Racing J Hook Discs are the epitome of endurance racing components. They will hold up extremely well to any abuse you plan to throw at them. These discs have been proven time and again in professional racing, winning many races and championships (SRO, IMSA, WEC, Rolex, etc.). Two-piece Floating Design with Aluminum Hat As is the case with most metal, iron brake discs grow substantially when heated. As it is heated, a disc expands radially, increasing in diameter and circumference. One-piece disc designs run into problems when this occurs. Look at the picture below and imagine the disc is being heated on the track. As the disc expands, the outer edges of the disc are pulling away from the center of the disc, but there are no built-in provisions to allow for that expansion. The edges of the disc therefore pull, lift, and distort, which is called coning. Now imagine that disc vertical on the car, running in your caliper. Coning directly impacts the brake pads’ contact with the disc, leading to uneven wear and tapering, and even a long brake pedal. Two-piece discs on the other hand, compensate for the expansion of the disc as it heats. This is accomplished by building ‘float’ into either the disc itself, or the disc hat/bell. In this case, the float is in the disc. If you look closely at the picture below, you can see that the mounting holes for the hat attachment bobbins are not round. They are an oblong shape. These channels allow the hat mounting hardware to slide as the disc is heated and expands, allowing the disc to run true in the caliper without distortion. That means less distortion, stress cracks, and pad taper.

AP Racing by Essex 2-piece Spline Drive Competition J Hook front disc pair for Porsche 911 (991) GT3 Cup: 380mm x 32mm (14.96" x 1.26") 72 Vane, D54 radial depth Innovative Spline Drive disc system derived from professional racing applications Designed for: club racing, time trial, autocross, HPDE Works with OE calipers, no modifications required Ultralight 2-piece fully-floating AP Racing J Hook disc with anodized billet aluminum hat

AP Racing by Essex 2-piece Spline Drive Competition J Hook front disc pair for Porsche 981 / 718 (982) Cayman GT4 Clubsport: 380mm x 32mm (14.96" x 1.26") 72 Vane, D54 radial depth Innovative Spline Drive disc system derived from professional racing applications Designed for: club racing, time trial, autocross, HPDE Works with OE calipers, no modifications required Ultralight 2-piece fully-floating AP Racing J Hook disc with anodized billet aluminum hat

AP Racing by Essex 2-piece Spline Drive Competition J Hook rear disc pair for Porsche 911 (991) GT3 Cup: 380mm x 30mm (14.96" x 1.18") 72 Vane, D47 radial depth Innovative Spline Drive disc system derived from professional racing applications Designed for: club racing, time trial, autocross, HPDE Works with OE calipers, no modifications required Ultralight 2-piece fully-floating AP Racing J Hook disc with anodized billet aluminum hat

AP Racing by Essex 2-piece Spline Drive Competition J Hook rear disc pair for Porsche 981 / 718 (982) Cayman GT4 Clubsport: 380mm x 30mm (14.96" x 1.18") 72 Vane, D47 radial depth Innovative Spline Drive disc system derived from professional racing applications Designed for: club racing, time trial, autocross, HPDE Works with OE calipers, no modifications required Ultralight 2-piece fully-floating AP Racing J Hook disc with anodized billet aluminum hat

AP Racing 2-piece J Hook Disc Front Rotor Kit 355x32mm Measuring 355mm x 35mm the AP Racing 13.05.10066 and 13.05.10067 are J Hook Competition Discs has a 54mm annulus with 72 directional cooling vanes used on the popular AP 13.01.10024 AP Racing C5 Corvette Front Six Piston Competition Brake Kit. AP Racing 2-piece J Hook Disc Front Rotor Kit 355x32mm Details: Manufacturer: AP Racing Manufacturer part number right side: 13.05.10066 Previous part number right side: 13.05.10002 Manufacturer part number left side: 13.05.10067 Previous part number left side: 13.05.10003 Slotted face: Yes Diameter: 355mm Thickness: 32mm Annulus radial depth: D54 Aluminum hat included: No Rotor harwdare included: Nos 14.0" x1.26" (355mm x 32mm), 72 Vane Significant unsprung weight reduction (over 3 lbs. per side) Much wider air gap and twice as many full internal cooling vanes reduce pad wear and brake fluid temps Fully floating vs. standard fixed-hat design= less coning, cracking, vibration/judder Aircraft nuts eliminate hassle of safety wire Crack-resistant disc metallurgy specifically designed to offer a long service life Anti-knockback disc attachment hardware reduces pad knockback through S-turns Common Fitment: AP Racing C5 Corvette Front Six Piston Competition Brake Kit Iron Disc Benefits So what can AP Racing J Hook iron discs do for a car previously equipped with carbon ceramic discs? Increased airflow and slower heat transfer to other brake components- AP Racing J Hook discs have a unique, high-count vane design that promotes airflow, heat evacuation, and rapid cooling. They don't rely on a large surface area to cool via radiation. The iron discs will move more air than your carbon ceramic's, and as a result they won't heat your brake pads, caliper pistons, and brake fluid up as quickly. You'll be able to run longer sessions without brake fade, and you'll enjoy the confidence that comes along with them. They'll also make any brake ducts that you have on the car more effective and useful. Huge range of compatible brake pad compounds- Iron discs will open up a much greater range of available brake pads. You'll be able to achieve a different feel, and tailor your brake setup depending on your needs and environment, whether that is running an AutoX or the most demanding racetrack in your area. You'll also likely be paying less per brake pad set than you were previously, and your pads will last longer. Inexpensive spare discs- You'll no longer have to spend thousands of dollars when it's time to replace your discs. AP Racing J Hook's typically only cost $400-600 per iron disc ring, so you won't have to stress about anything happening to them. They're inexpensive enough that you can always keep a spare set on hand, so you won't have to worry about any brake-related downtime when you're out at the track. Durability- Iron discs can take a beating. You can stash your spares in your race trailer, and you won't have to worry about handling them, covering them, dinging them, or chipping them when changing your wheels. As you can see, although iron discs do come with a slight weight penalty, they're still the smart choice if you run your car hard on the racetrack. They're the obvious solution that has been proven countless times on tracks around the world, at all levels of motorsport. Among iron disc choices, there are none better than AP Racing J Hooks. AP Racing J Hook Discs are the epitome of endurance racing components. They will hold up extremely well to any abuse you plan to throw at them. These discs have been proven time and again in professional racing, winning many races and championships (SRO, IMSA, WEC, Rolex, etc.). Two-piece Floating Design with Aluminum Hat As is the case with most metal, iron brake discs grow substantially when heated. As it is heated, a disc expands radially, increasing in diameter and circumference. One-piece disc designs run into problems when this occurs. Look at the picture below and imagine the disc is being heated on the track. As the disc expands, the outer edges of the disc are pulling away from the center of the disc, but there are no built-in provisions to allow for that expansion. The edges of the disc therefore pull, lift, and distort, which is called coning. Now imagine that disc vertical on the car, running in your caliper. Coning directly impacts the brake pads’ contact with the disc, leading to uneven wear and tapering, and even a long brake pedal. Two-piece discs on the other hand, compensate for the expansion of the disc as it heats. This is accomplished by building ‘float’ into either the disc itself, or the disc hat/bell. In this case, the float is in the disc. If you look closely at the picture below, you can see that the mounting holes for the hat attachment bobbins are not round. They are an oblong shape. These channels allow the hat mounting hardware to slide as the disc is heated and expands, allowing the disc to run true in the caliper without distortion. That means less distortion, stress cracks, and pad taper.

CALPIER REBUILD KIT FOR ALFA GUILIA CCM FRONT 28mm/32mm/38mm GiroDisc CCRK1-209 front caliper rebuild kit for Alfa Guilia CCM front caliper with 28mm/32mm/38mm seals. Track days can be especially hard on the piston seals and dust boots in your brake calipers. Heat, in particular, will do a number on them. (Titanium heat shields behind your pads can help with that.) This kit is put together from the highest-quality components to rebuild a brake caliper back to like-new condition. One kit is required per caliper (we suggest doing them both as long as you're doing it). Once you rebuild them, get the Ti heat shields as well and lengthen the interval between rebuilds. The shields and seals are available as a kit for convenience (and a bit of savings). We only source superior quality brake components (brakes for track use are serious business); some kits don't take it as seriously. Any questions give us a call, we're happy to help!

CALPIER REBUILD KIT FOR ALFA GUILIA CCM REAR 34mm/40mm GiroDisc CCRK2-209 front caliper rebuild kit for Alfa Guilia CCM rear caliper with 34mm/40mm seals. Track days can be especially hard on the piston seals and dust boots in your brake calipers. Heat, in particular, will do a number on them. (Titanium heat shields behind your pads can help with that.) This kit is put together from the highest-quality components to rebuild a brake caliper back to like-new condition. One kit is required per caliper (we suggest doing them both as long as you're doing it). Once you rebuild them, get the Ti heat shields as well and lengthen the interval between rebuilds. The shields and seals are available as a kit for convenience (and a bit of savings). We only source superior quality brake components (brakes for track use are serious business); some kits don't take it as seriously. Any questions give us a call, we're happy to help!