Brembo Performance (GT, GT-R) & Brembo Racing systems – Subaru Impreza WRX STi

Brembo Performance (GT, GT-R) & Brembo Racing systems – Subaru Impreza WRX STi

 BREMBO RACING APPLICATION

Written by G.Krishnan and G.Taniguchi

The Subaru WRX STi is demanding on brakes due to the high COG (Center of Gravity), longer pedal stroke (pedal ratio), and the chassis balance which forces the front brakes to do a bulk of the braking work. Brembo performance and specific race systems are designed with each specific application and the chassis requirements in mind. This specific 4 piston Brembo Racing system using a 328 x 35 mm disc for the Subaru WRX STi was designed specifically to help clear most 17″ wheels and with a true motorsport application in mind (Touring Car Racing). Understanding that each chassis, team, driver pairing is different: all the variables were considered when engineering a race system for a professional team racing in a professional series versus an OEM type or aftermarket system designed for a wide range of operating environments that a road system would experience to the occasional rigors of a track day.

2015 Spec Subaru NBR 24 Brembo brakes. Photo: Subaru MSM

2015 Spec Subaru NBR 24 Brembo brakes. Photo: Subaru MSM

Subaru Nurburgring 24 Challenger - Brembo Racing package equipped

Subaru Nurburgring 24 Challenger – Brembo Racing endurance package equipped

Advantages of the Brembo Racing Disc Range:

  • Stock Disc Size:  The OE Subaru WRX STi stock disc size is 325 x 30 and most aftermarket systems on the market which clear smaller wheels make a considerable compromise in thermal capacity. This is why Brembo offers a 328 x 35 mm or 350 x 34 mm Brembo type V or type III face type disc. These racing discs for the Brembo race systems are a huge step up in thermal capacity compared to OE and the thermal mass is closer to what all professional Subaru STi motorsport GT teams are using around the world.
  • Disc Casting/Vane Count:  Brembo is one of the only braking companies which controls the engineering, design, and manufacturing process of components and brake systems from start to finish. The specific Brembo Racing 328 x 35 mm disc uses a large 19 mm air gap typically (vs. 10-14 mm) and 72 vane disc configuration which is designed to maximize the cooling surface area of the disc while keeping the Outer Diameter (OD) of the disc on the smaller side to assist with wheel clearance.  The Brembo vane design is substantially better than the vane designs used by the OE discs or typical “racing” branded products.
Brembo 328 x 35 72 vane discs. Photo: Lachute Performance.

Brembo Racing 328 x 35, 72 vane discs. Photo: Lachute Performance.

  • Brembo type V Face type:  The Brembo type V face type is a motorsport developed face type with comparable initial response compared to a typical sprint disc while focusing on braking control, modulation and low wear of the consumable parts (pads/discs). The Brembo Racing type V face type is designed to offer lower pad and disc wear for certain long distance endurance races or heavy duty braking applications.
Brembo Race system with Type V Discs. Photo: Lachute Performance.

Brembo Racing 4 piston system with Type V Discs. Photo: Lachute Performance.

  • Pad Area / Disc Surface Area:  The stock Subaru WRX STi 4 piston pads use a large annulus (radial depth from outer to inner diameter of the disc) for maximum pad surface area. For this heavy duty STi motorsport package, Brembo engineered it with an extremely high thermal brake disc which is 35 mm thick and also has an annulus (radial depth from OD to ID of disc) of 64 mm (the specific pad uses a 61.5 mm annulus).  This increased annulus leads to higher overall thermal capacity leading to lower disc temperatures and significant improvements in the pad and disc life.


Advantages of the Brembo Racing Caliper Range:

Brembo develops vehicle specific performance and racing brake packages designed specifically for the chassis they are supplied for. All Brembo race systems include all the specific parts needed to bolt the system right onto the vehicle without any modifications.

  • Brembo 4-piston caliper range: Brembo Racing calipers are specifically chosen for the intended applications and environments they are used for. The 4-piston Brembo Racing caliper used specifically for many of the more affordable or track day race systems can accept a 328 > 355 mm diameter disc range with either a 32 or 34 mm disc thickness. The caliper is also available in many various piston size configurations so the pistons can be sized specifically for proper brake balance. As generally production based cars have much higher weights, horsepower levels, and are more “open” in terms of setup versus dedicated race cars, a proper caliper is specified to meet the demands. This extended range gives Brembo the ability to tailor the brake system (caliper, brake discs, and pads) specifically to the chassis whether for motorsports or track day use.
Brembo Racing calipers are available in a wide range of piston configurations and can accept a wide range of discs. Photo: Alex Roy

Brembo Racing calipers are available in a wide range of piston configurations and can accept a wide range of discs. Photo: Alex Roy

  • Piston Size:  Brembo engineers racing systems specific to the chassis and the application keeping the growing demands of the user in mind. The Subaru WRX STi OE caliper and the caliper used with this race system use 40 / 44 mm pistons. The effective brake torque required by the STi is closer to 40 / 44 because the chassis does most of the braking in the front. Brembo race systems generally keep the brake balance close to what the requirements of the chassis are, as altering or moving the brake balance significantly can detrimentally affect the chassis dynamics on the street or race track.
Brembo Racing 4 piston caliper with staggered pistons for optimum balance. Photo: Alex Roy

Brembo Racing 4 piston caliper with staggered pistons for optimum balance. Photo: Alex Roy

  • Brake Feel & Control: Brembo calipers offer superior braking feel and control compared to other calipers on the market. This comes from the many years of experience engineering and manufacturing motorsport calipers, including pistons, and piston seal grooves which heavily influence brake feel which is critical at the highest levels of professional motorsports. This is also one key reason why Brembo is used prominently throughout all forms of motorsports.
  • Heat Rejection:  Brembo motorsport specific calipers (including the Brembo Performance GT-R caliper range) use either solid or ventilated stainless steel piston inserts for effective heat rejection. This helps protect the brake fluid and caliper seals from heat allowing greater braking stability in extreme duty or motorsport applications. Depending on the application and caliper design, the piston or piston insert material and design can be specified accordingly.
Stainless steel inserts on a Brembo Racing caliper. Photo: Alex Roy

Stainless steel inserts on a Brembo Racing caliper. Photo: Alex Roy

  • Knock back:  brake pedal knock back is generally not a function of the brakes and more of flex in the upright, hub or knuckle assembly. However, symptoms of knock back (pedal travel requiring the driver to double-tap the pedal prior to the brake zone) are generally felt in the brakes leading to a lack of confidence from the driver. Brembo can work closely with the customer (or team) to trouble shoot and remedy knock back like symptoms in ways which are specific to the application. Some of the ways knock back can be remedied are through: specific piston sizes, adjustment of float in the disc to hat assembly or occasionally through knock back springs if the piston design can accept the springs. Contrary to popular belief, there is no one “magic bullet” solution or component which can cure knock back without other technical drawbacks.

This is why it is important to understand the customer’s requirements, and work closely to address their technical needs.

  • Swing Bridge: Brembo calipers are specified with swing or integral (fixed) bridges depending on the intended environment and chassis. Brembo’s swing bridge design requires no tools to open up the caliper to change brake pads. When a chassis or category of racing requires a fixed integral bridge, a specific caliper can be supplied to meet those demands.
Brembo Swing Bridge design allows for fast pad changes. Photo: Alex Roy

Brembo Swing Bridge design allows for fast pad changes. Photo: Alex Roy

  • Overall Pad Thickness: The Brembo OE WRX STi calipers use a standard 15 mm pad, and Brembo Performance calipers can accept up to an 18 mm pad depending on the exact caliper spec. With Brembo Racing calipers, they can usually accept a 20, 25, or 29 mm pad depending on the exact caliper specification. This can be quite a significant gain because thicker pads not only dramatically improves overall pad wear rates, but it also helps with overall pedal consistency (pads also function as a barrier against heat transfer to the pistons from the braking surfaces).
Brembo Race system. Photo: Lachute performance

Brembo Race system for Subaru WRX STi. Photo: Lachute performance

LP Motorsport STi competing in Canadian Touring Car Series. Photo: Lachute/LP Motorsport

LP Motorsport STi competing in Canadian Touring Car Series. Photo: Lachute/LP Motorsport

BREMBO PERFORMANCE “HIGH-THERMAL” APPLICATION:

Due to nature of the Subaru WRX STi and the brake demand of the application, Brembo Performance “High-Thermal” or Heavy Duty packages are also offered for street and track use. The Subaru STi, depending on the model, did get a range of OEM Brembo systems starting with 4 piston front / 2 piston rears or 6 piston front / 2 or 4 piston rears for certain overseas models. Brembo works very closely with car manufacturers to develop specific brake solutions for specific models and markets however, with OEM systems, there are always compromises as these systems are still limited by cost, serviceability, and comfort requirements of the car manufacturer.

STi RA-R OE System

Subaru STi RA-R / R205 OE Brembo System

The Subaru Impreza STi Type RA-R and R205 models (Non US, overseas models only) got the most sophisticated of the OE Brembo systems. They feature Brembo 6 piston front and 2 or 4 piston rear calipers, paired with a 340 x 32 mm Brembo front disc using a very unique high performance face type. Sourcing, retrofitting, and servicing these OE brake systems is generally very time consuming as OE Subaru parts can only be sourced from Subaru (per Brembo’s relationship with the auto manufacturer) which can really add up because the replacement parts are unique to the OE components (replacement disc rings, seals).

The Brembo Performance 350 x 34 “HD” brake system for the Subaru WRX STi offers significant improvements even over the high performance Subaru OE System while being cost effective ($3995 MSRP versus $4000-$5000 for the Subaru OE components):

Brembo 350 x 34 HD System for Subaru WRX STi

Brembo Performance GT system: 350 x 34 HD (Heavy Duty/High Thermal) system for Subaru WRX STi

Brembo Performance Caliper and Pad Feature & Benefits:

  • Feature: 6 piston sequential pistons sized specifically to the STi OE Master cylinder, ABS, and chassis.
  • Benefit: Maintain optimum performance and brake balance for the Subaru Impreza WRX STi for street or track use while minimizing pad taper.

  • Feature: Lightweight Mono bloc caliper with integral bridge versus a standard pin bridge on the Subaru Brembo OE system.
  • Benefit: Improved rigidity and pedal feel in a wide range of environments from high performance street to track use.

  • Feature: High temperature recessed seals and dust boots.
  • Benefit: Optimum performance at elevated temperatures seen on track while still maintaining drivability on the street. Motorsport use only calipers without dust seals need interval servicing as the piston seals do not have any protection against the environments.

  • Feature: Larger brake pad area compared to OE, while using wide 65 mm annulus, and 18 mm overall thickness*
  • Benefit: Using thicker pads with greater pad surface area helps with overall longevity of consumables and stable performance.

*Subaru WRX STi RA-R/R205 OE 6 piston caliper pads use a smaller pad area, using a 54 mm annulus and are only 15.5 or 16 mm thick*

  • Feature: Friction material choices**
  • Benefit: Whether used for performance street or for dedicated track use: Race Technologies can choose from a wide range of street/track dual purpose, sprint or endurance race pads to best suit the customer’s intended use and environment.

**All Brembo systems come equipped with high performance Brembo/Ferodo FM1000 brake pads, which is a great dual purpose street and track compound. However, for specific use, other compound choices are available upon request.

Pad Options for Brembo Performance systems

There’s a range of pad options for Brembo Performance systems (Brembo, Ferodo, Race Technologies, etc).

Brembo Performance Disc Assembly Feature & Benefits:

  • Feature: Brembo 350 x 34 mm, 68 mm wide annulus, “high thermal” discs.
  • Benefit: Improved brake torque and durability over the 340 x 32 mm OE Subaru 6 piston system discs found on the Impreza STi RA-R/S205 OE System.

  • Feature: 72 directional vane ventilation, with 19 mm air gap.
  • Benefit: Vastly improved cooling efficiency over the Subaru OE system pillar vane ventilation type, while maintaining the increased thermal capacity of the disc. This translates to lower brake temperatures and greater life of components under heavier use.
Brembo 72 vane ventilation

Brembo directional high thermal 72 vane ventilation which is a substantial increase over the Brembo OE pillar vane design.

  • Feature: Brembo Racing discs using Type III motorsport developed face type.
  • Benefit: Highest overall braking confidence as the Brembo’s aggressive face type places a strong emphasis on a high initial response (bite) and smooth release characteristics.
Brembo Type III Racing Disc

Brembo Type III Racing Disc

  • Feature: Brembo Performance 2-piece disc assembly with anti-rattle hardware.
  • Benefit: Brembo Performance 2 piece disc assemblies are lighter and more durable than typical 1 piece disc or other “aftermarket” 2 piece disc assemblies. Brembo anti-rattle hardware allows the disc to expand and float on the bell while reducing noise. When time for replacement, only the disc ring and hardware needs to be replaced instead of the entire disc assembly.
Brembo Anti-Rattle hardware

Brembo anti-rattle hardware (a Brembo innovation)

Brembo’s extensive background in professional motorsport with Subaru and as the OE brake supplier to Subaru gives extensive experience with the platform’s braking needs. This allows Brembo to develop a wide range of performance and racing solutions to meet the growing demands of Subaru customers whether for street, track or racing use.

Subaru Nurburgring 24 Challenger

Subaru Nurburgring 24 Challenger equipped with Brembo Racing brake package.

Other key advantages:

  • Friction Program & Development:  Race Technologies and Brembo have a flexibility with friction that few brake manufacturers and suppliers have.  Unique compounds and pad shapes can be developed in relatively short lead times to meet the growing demands of professional racing teams and drivers.  With the greater thermal capacity engineered into the Brembo system, we can choose higher friction, heavier duty friction pad options as well.  Race Technologies has helped several top factory supported Motorsport teams win endurance, sprint races & championships in professional racing purely based on the available range of the friction program.
Race Technologies Pads

Race Technologies pads. These pads were developed to offer up a specific solution for track or race use.

  • Brembo HTC64T brake Fluid:  Brembo is one of 2 brake fluid suppliers to F1 and the Brembo HTC fluid is also one of the few racing brake fluids being actually purchased by professional sports car racing teams. Brembo Racing fluids have lower compressibility which leads to a more consistent pedal feel, better fluid recovery, and higher dry boiling points compared to other fluids.
Brembo Racing and Performance Fluid Range

Brembo Racing and Performance Fluid Range: HTC 64T (track, racing), LCF600 plus (street, track, racing), Sport EVO 500++ (street)

Brembo (General News) Brembo Performance Brembo Racing

Brembo 2-piece disc, brake fluid, and pad install on GMG Racing’s 991 GT3

GMG Racing 991 GT3 – Brembo Performance Install & Review

GMG Racing, an Official Brembo dealer, is one of the premier high performance and professional racing shops in Southern California who specialize in Porsche track preparation. GMG Racing’s background in professional racing campaigning multi-car efforts in the Pirelli World Challenge series with both Porsche and Audi FIA GT3 platforms. Using this extensive racing experience accumulated over the years, GMG Racing also offers up the same upgrades supplied by their technical partners that they trust on the racetrack.

James Sofronas, owner driver of GMG Racing, also owns a personal 991 GT3 shop car to showcase GMG’s capabilities on and off the track. One such way is by holding track day and driver training specifically for 991 GT3 owners at The Thermal Club raceway which is very demanding on brakes and tires.

GMG Racing 991 GT3 Trackday. Photo Credit : GMG Racing

GMG Racing 991 GT3 Trackday. Photo Credit : GMG Racing

One of the first major upgrades done to the GMG Racing’s 991 “WC-GT3” was improve the braking reliability, longevity, and performance under track use. GMG Racing swapped out the Porsche OE discs, pads and fluid on the 991 GT3 with Brembo 2-piece discs, Race Technologies pads, and Brembo Racing HTC64T fluid.

GMG Racing 991

GMG Racing 991 “WC-GT3”

INGREDIENTS REQUIRED:

  • Porsche 991 GT3
  • GMG Racing
  • Brembo 2-piece front disc assemblies.
  • Brembo 2-piece rear disc assemblies
  • Your choice of front and rear pads although Race Technologies TS20’s were used.
  • 6 bottles of Brembo HTC64T Racing brake fluid.
  • Tarett Engineering brake caliper studs (*optional, supplied by GMG Racing)
GMG Racing 991 GT3.

GMG Racing 991 GT3 in stock form.

BRAKE DISC COMPARISON

While the 991 GT3 has very sophisticated brakes for an OE brake package, there is always more that can be done with certain components to improve overall longevity and performance. The OE Porsche brake discs, pads and fluid are all engineered with comfort, serviceability and cost effectiveness in mind.

Brembo OE co-cast discs

Brembo OE co-cast discs

As the braking system’s primary function is to dissipate heat, Brembo uses purpose-designed discs in order to increase the fade resistance and thermal capacity of the system. These discs are directionally ventilated for enhanced cooling and slotted for better performance and continuously refreshing the pad surface. Brembo 2-piece discs are made up of a proprietary advanced cast-iron alloy which offers an exceptional coefficient of friction and resistance to thermal shock and fatigue.

The same Brembo Racing discs trusted every weekend in professional motorsports are also utilized in the Brembo Performance program (GT, GT-R & club race systems).

The OE 991 GT3 co-cast Brembo discs are sized 380 x 34 mm in the front and weigh 24 lbs, and 380 x 30 mm in the rear weighing at 23.4 lbs. The Brembo Racing Heavy Duty “HD” type V front disc assemblies are 24.5 lbs, and the rear Type III assemblies are 22 lbs. The 991 Turbo discs are substantially heavier than the GT3 discs as the Turbo models are harder on front brakes than the GT3 models. Brembo 2-piece disc assemblies on a 991 GT3 or Turbo will offer a net gain in weight savings.

Brembo Porsche OE discs vs Brembo Performance 2-piece disc assemblies

Brembo Porsche OE discs vs Brembo Performance 2-piece disc assemblies

There are many advantages to replacing the OE discs on a Porsche GT3 or Turbo, some of them are:

  • OEM Integration: Brembo upgrades are designed to work seamlessly with the OE Master, ABS and existing brake systems (Example: Integration with the rear parking brake)
  • Weight Savings: Reducing overall un-sprung weight helps improve vehicle dynamics such as handling, braking, and acceleration.
  • Durability: The Brembo discs for these Porsche disc assemblies come from the Brembo Racing program. These discs feature proprietary metallurgy which is resistant to fatigue, cracking, and are engineered for maximum longevity on the street or track.
  • Different Slot Types: Extensively used in professional motorsports, Brembo type III and type V disc face types can be used to tune or adjust the brakes’ technical characteristics to the chassis or driver.
  • Range: Brembo offers lightweight and heavy duty “HD” disc options to suit the needs of the driver, car model (Turbo or GT3) /setup and environment.
  • Replacements: Brembo replacement rings are comparably priced to OE, and when the Brembo discs are worn, only the outer disc ring and hardware needs to be replaced.
  • Drivability: Brembo 2-piece discs maintain the drivability of the OE brakes by using anti-rattle hardware. Brembo’s specific anti-rattle disc hardware utilizes a spring fastener in order to slightly preload the assembly which eliminates the noise (clattering) generally associated with floating discs.

Brembo OE Porsche disc vs Brembo 380 mm 72 vane racing disc

Brembo McLaren spring

Brembo McLaren spring

NOTE: Brembo’s specific anti-rattle hardware which is commonly used in high performance brake disc assemblies was actually developed in the 1990s. This innovation was initially engineered exclusively for the McLaren F1 supercar which is why the hardware is often nicknamed the “McLaren” spring.

 BRAKE DISC INSTALLATION

GMG technicians Ruben and Sergei (who drives a 997 Turbo himself) used their extensive Porsche know how to install the Brembo 2 piece disc assemblies on the GMG 991 GT3 shop car.

GMG Technicians working on GMG 991 GT3

GMG Technicians working on GMG 991 GT3

 FRONT DISC ASSEMBLIES

The OE front discs were the first to be installed. The Brembo performance 2-piece discs and Race Technologies pads are a direct replacement to the OE units. GMG made sure to push the pistons all the way back in to ensure proper stack width (2 pads and brake rotor total width). The Porsche center lock “lug” was then removed and the Brembo 2-piece disc assembly and pads were then installed. Once the Brembo performance disc assemblies were fitted, the OE Caliper was re-installed using brand new caliper studs. The entire process was done on the front right disc, and then the front left disc.

Porsche 991 GT3 OE front brakes

Porsche 991 GT3 OE front brakes

Porsche centerlock unit

Porsche centerlock unit

Brembo Porsche OE front disc vs Brembo 380 mm racing disc and pads.

Brembo Porsche OE front disc vs Brembo 380 mm racing disc and pads.

The Race Technologies TS20 compound was specified as the baseline pad since the car will be street driven and used on the track. The TS20 offers low noise, dust and good pedal feel. It is also an excellent dual purpose compound for street and light track use.

Brembo 2-piece disc assembly fitted

Brembo 2-piece disc assembly fitted

Brembo 2-piece disc assembly installed

Brembo 2-piece disc assembly installed

Since the GMG Shop car is also their test car, the car will see extended track time on many southern California circuits. A Brembo Type V 380 x 34 mm front disc was specified for the lowest disc and pad wear under heavy track conditions. An optional Race Technologies endurance compound was also supplied for dedicated track use.

  • Brembo Type V (endurance face type): motorsport developed face type with marginally less initial response compared to the type III face type. The Brembo Racing type V face type was also designed to have lower pad and disc wear for certain long distance endurance races (mostly 10, 12 and 24 hour races).

REAR DISC ASSEMBLIES

Once the front disc assemblies were installed, GMG then turned their attention to the rear discs and pads. The exact same installation procedure was followed for the rear disc assemblies as well. The rear right corner was installed first, and then the rear left corner was installed. GMG installed new caliper studs on the rear as well when re-installing the OE Porsche calipers. Race Technologies TS20 compound pads were used for the rears as the baseline pad.

Porsche 991 GT3 rear brakes

Porsche 991 GT3 rear brakes

Porsche OE 991 GT3 rear discs vs Brembo performance Type III discs

Porsche OE 991 GT3 rear discs vs Brembo performance Type III discs

Tarrett Engineering Caliper studs used by GMG Racing.

Tarett Engineering Caliper studs used by GMG Racing.

GMG installed Tarett Engineering caliper studs.

GMG installed Tarett Engineering caliper studs.

RT TS20 rear pads

RT TS20 rear pads

The Brembo Type III 380 x 30 mm rear brake disc was specified for optimum balance and brake release under heavy track conditions. This is because the 991 GT3 shifts its’ brake balance towards the rear under braking. The smooth release characteristics of the Brembo Type III face type can help a driver avoid rear tire in stop lock up while still maintaining optimum braking performance.

  • Brembo Type III (aggressive face type): motorsport developed face type with an emphasis on high initial response while maintaining a smooth pedal release.
Brembo 380 x 30 Type III rear disc fitted.

Brembo 380 x 30 Type III rear disc fitted.

Brembo Performance Type III rear discs installed on GMG 991 GT3

Brembo Performance Type III rear discs installed on GMG 991 GT3

As mentioned earlier in this article, the Brembo 2-piece disc assemblies are compatible with the Porsche factory parking brake. One does not have to compromise and lose the parking brake functionality when installing the Brembo disc assemblies.

BRAKE FLUID AND BLEED

Upgrading brake fluid for spirited, track or racing use is easily one of the most overlooked things when thinking of upgrading any component or part of the brake system. Brembo’s HTC64T brake fluid is the top fluid used in the top professional racing categories around the world (Examples: F1, FIA GT, LMP1). This is because the Brembo fluid offers low compressibility, good after boil recovery, and high boiling points.

  • Brembo HTC64T Typical Applications: Open Wheel*, Stock Car, Rally, Endurance & Sprint GT**, Track Day.

*Brembo HTC64T is one of a very few select fluids being actively used by F1 teams.

**Brembo HTC64T and LCF600 Plus are both racing brake fluids which are actively used and homologated for FIA GT3 & GTE based sports-car racing.

  • Independently proven low Compressibility at severe temperatures.
  • Dry Boiling Point: 335 C (635 F)
  • Racing Use Only
Brembo HTC64T

Brembo HTC64T (used in F1, FIA, GT, LMP1)

Brake fluid performs a very critical function as it is the “life blood” of the brake system, as it is the foundation to hydraulically transfer brake pedal effort to the brake caliper’s pistons. Brake fluid also performs a vital function of lubricating caliper piston seals brake fluid performance (or the lack of) can directly affect brake pedal feel, pressure and consistency through the operating temperature range. It is also one the most cost effective ways to improve brake pedal consistency (avoiding spongy pedal) under high temperature use.

Once the Brembo performance 2-piece disc assemblies and RT pads were installed on all four corners, the OEM brake fluid was flushed and bled with Brembo Racing HTC64T brake fluid. As the fluid was being bled on each corner, GMG made sure to keep an ample amount of new fluid filled in the master cylinder reservoir to ensure that air did not enter into the hydraulic system.

Brembo fluid bleed

Brembo fluid bleed

Brembo HTC64 being poured in

Brembo HTC64 being poured in

ON TRACK IMPRESSIONS

To evaluate the results of the new Brembo discs, fluid bleed, and RT pads, the GMG Team took the 991 GT3 shop car to Thermal Club.

Driver (James Sofronas) and GMG Team comments: Testing out a new setup @thethermalclub today! @jamessofronas had the GMG 991 GT3 out and with the new Brembo Brake pad and Rotor setup says that the car is even more amazing! A predictable pedal feel without activating the ABS too early. A must have for any car that is going to see some track time! Combined with Pirelli Trofeo R tires it is just a winning combo!

Thermal Club Track layout. Image: Thermal Club

Thermal Club Track layout. Image: Thermal Club

Thermal Club located in Palm Springs, California often has very high ambient temperatures which can be demanding on the car, tires, and brakes. The effectiveness of brake cooling is only as good as the temperature of the air flowing thru the brake ducts (if the ambient air is hotter, the brakes will not cool down as much). The track layout and surface can be very similar to some of the European GT tracks, featuring many high speed to low speed braking zones, and a high level of mechanical grip (the more grip you have, the harder you can brake). GMG Racing has setup their shop GT3 understanding the demands of the various tracks around Southern California, and the Porsche 991 GT3, for optimal results.

GMG Racing 991 GT3 and R8 LMS Ultra at Thermal

GMG Racing 991 GT3 and R8 LMS Ultra at Thermal

Modern sports cars have very sophisticated OE ABS systems and engaging the ABS under braking can lead to poor threshold braking, lack of pedal feel, and potentially result in a slower lap time. Having a high overall level of braking confidence and control, usually allows the driver to spend less time on the brake pedal. If the brakes offer enough performance and control for the driver to stay out of ABS engagement (depending on their driving style and car setup), the result is usually a faster lap time on track.

Brembo (General News) Brembo Performance