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Old 12-31-2016, 09:09 PM   #1
SpeedMasterLee
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Default Brembo GT 6 Piston "HD" Kit by Race Technologies AKA Brembo

I just wanted to do a recap of what I have learned while researching for a new brake setup for my 05 Sti. One of the quintessential part of any motorsports is the ability to slow down a fast car. There are many misconceptions about upgrading brake systems. People are under the impression that bigger is better and the more pistons a brake caliper has is what makes a brake system superior to others which is not always true. When deciding on the proper application many factors need to be taken into account when choosing the most optimal brake system for your car.

Brake systems are often designed with a particular goal in mind, and the type of use it will go through. Braking systems are designed to operate the best within a prescribed temperature range so having a rotor disk too large will limit its temperatures to the extreme lower end of a pads temperature range and not allow it to reach the optimum range and also create unnecessary weight. Reducing the weight of any braking system will reduce the amount of unsprung weight and improve suspension performance, which will in turn result in enhanced ride and handling. There is a point when too big actually decreases overall braking performance.

Factory brake systems often come with floating brake calipers that have a single piston on the inboard side, or fixed calipers that have a single pair of pistons flanking the rotor disc both of which are inexpensive to manufacture and generally heavy. These types of braking systems are no match for high performance calipers that have multi piston or pairs of pistons that are mounted on opposing sides of the rotors which increases the clamping force of the caliper. As the rotors heat up the clamping force of the pistons need to be increased in order to avoid brake fade. Differential bore calipers use smaller pistons up front, and larger pistons toward the trailing edge of the caliper to help increase overall braking power and eliminate pad taper.

Brembo is one of the leaders in braking systems technology currently operating in 16 countries and has a long partnership with Race Technologies who serves the automotive performance and racing community. Race technologies is the sole U.S. Importer for Brembo High Performance, and official importer for Brembo Racing. The partnership between Race Technologies and Brembo lead to the development of the Gran Turismo, or “GT” Braking system which was designed and engineered entirely by Brembo.


The GT systems is the most popular high performance brake system for the street and track. The brake calipers come with opposed piston calipers, as well as 2 piece discs that increase thermal capacity that will reduce overall brake fade. Brembo system’s come delivered with preloaded calipers that are equipped with unique pad retaining features and sequential piston bores in order to provide even pad wear and provide optimum performance.

Brembo calipers also feature quick release pad retaining system that incorporates anti-rattle feature (pictured) to eliminate noise, and designed for quick and easy pad changes for the track for the weekend track enthusiasts.


All Brembo calipers also come with mounting brackets designed vehicle specific and are precision milled from superior quality billet materials to ensure a precise fitment and meet and exceed industry strength requirements of high performance driving conditions.



The Brembo GT kit can be ordered with three different rotor options that are all 2 piece in design as as made with superior metallurgy and exceptional engineering that allows the discs to exceed the most demanding conditions. Some of the more important features of any rotor is the A) Annulus, B) disc width, C) air gap, and D) vane design.


A. Annulus: The distance between two concentric circles. Or the disc friction surface.


B. Disc width: The overall thickness of the disk itself.


C. Air Gap: The distance between the inner rotors, separated by the vanes.
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Last edited by SpeedMasterLee; 12-31-2016 at 10:16 PM.
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Old 12-31-2016, 09:09 PM   #2
SpeedMasterLee
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D. Vane Design: exclusive venting system that improves cooling capacity which reduces brake fade.




Brembo also uses a proprietary floating hardware system that permits a specific amount of radial and axial float which allows the disc to grow independent from the bell, that helps with thermal distortion and extreme temperatures which prevents the premature wear and eliminate noises associated with aftermarket two-piece rotor designs.


The center section or ***8220;BELL***8221; is precision milled billet aluminum lightweight design saves a great deal of weight in the center section which reduces unsprung and rotating weight without sacrificing strength or longevity.








My comparison of the Subaru Impreza STi RA-R vs. GT "HD" (Heavy Duty) kit
Now the most coveted brakes that Subaru owners dream of is the Subaru Impreza STi Type RA-R and R205 models (non US, overseas models only) that feature Brembo 6 piston front and 2 or 4 piston rear calipers, paired with a 340x32 mm Brembo front disc using a unique high performance face type.


The Brembo Performance 350x34 "HD" (Heavy Duty/High Thermal) brake system for the Subaru WRX STi offers significant improvements over the high performance OE systems while being cost effective ($3995 vs $4000-5000 for the Subaru OE component.



Brembo Performance Caliper and pad feature & Benefits:

*Feature: 6-piston sequential piston sized specifically to the STi OE Master cylinder, ABS, and chassis. *Benefit: Will maintain optimum performance and brake balance for the Subaru Impreza STi for street or track use while maintain G pad taper.




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

Last edited by SpeedMasterLee; 01-01-2017 at 05:01 PM.
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Old 12-31-2016, 09:10 PM   #3
SpeedMasterLee
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*Feature: High Temperature recessed seals and dust boots.
*Benefit: Optimum performance at elevated temperatures seen on the track while still maintaining drivability on the street. motorsport calipers without dust boots for the pistons require REGULAR maintenance for optimal function, not just interval. Motorsports brakes are rebuilt after every race to ensure flawless performance. Streetcars would be very inconvenienced by this and would not be good candidates for motorsport brakes.



*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 hells with overall longevity of consumables and stable performance.






(*Subaru RA-R/R205 OE 6 piston caliper pads use a smaller pad area, using a 54mm annulus and are only 15.5 or 16mm thick.)
*Feature: Friction material choices**
** 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 compounds choices are available upon request.


Brembo Performance Disc Assembly Feature & Benefits:
*Feature: Brembo 350x34 mm, 68mm wide annulus, "high thermal" discs.
*Benefit: Improved brake torque and durability over the 340x32 mm OE Subaru 6 piston system discs found on the Impreza STi RA-R/S205 OE system.



*Feature: 72 directional vane ventilation, with 19mm air gap.
*Benefit: Will vastly improve 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.






*Feature: Brembo Racing discs using Type III motorsport developed face type.
*Benefit: Highest overall braking confidence, the Brembo's agressive face type places a strong emphasis on a high initial response (bite) and smooth release characteristics.

Last edited by SpeedMasterLee; 12-31-2016 at 09:16 PM.
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Old 12-31-2016, 09:10 PM   #4
SpeedMasterLee
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*Feature: Brembo Performance 2-piece disc assembly with anti-rattle hardware.
*Benefits: Brembo Performance 2-piece disc assemblies are lighter and more durable than typical 1 piece disc or other "aftermarket" 2-piece 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.



Overall the comparisons shown above show that you don***8217;t need to spend a considerable amount of money for an inferior big brake kit when you can just purchase a far superior kit directly from any Brembo brake distributor unless you need the satisfaction of having a JDM BBK. The kit featured in this article were custom painted Subaru STi Brembo gold with the original decals changed to the Old school Brembo decals that use to come on Brembo Racing Brakes.

After 6 months of these brakes on my car I can definitely say that these are absolutely one of my favorite mods that I have ever installed on my car. My brake confidence is beyond what I expected and now I have to look in the rear view mirror to make sure that when I hard brake the car behind me is not following too close. Currently the brake feel is very linear and feels almost stock during regular stops but when you slam on the brakes the whole car is anchored to the concrete.

If you are looking for a big brake kit I would really do your research and look at the key features that I have pointed out to make your comparison and not just look at the size of the kit to make your decision. Not all brakes are made or designed the same so make sure you get what you paid for and get the best bang for your buck.



Last edited by SpeedMasterLee; 12-31-2016 at 09:25 PM.
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Old 01-01-2017, 09:01 AM   #5
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Fantastic write up.
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Old 01-01-2017, 02:43 PM   #6
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A lot of very good information was given out. Time to start doing my homework and see which breaks are good for me. Thank you speedmasterlee.
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Old 01-01-2017, 03:05 PM   #7
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Wow that's some serious stopping power. I like how you painted it the factory gold to keep it low key.
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Old 01-01-2017, 04:15 PM   #8
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Great job
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Old 01-03-2017, 07:23 PM   #9
BadSubby
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Quote:
Originally Posted by SpeedMasterLee View Post
I just wanted to do a recap of what I have learned while researching for a new brake setup for my 05 Sti. One of the quintessential part of any motorsports is the ability to slow down a fast car. There are many misconceptions about upgrading brake systems. People are under the impression that bigger is better and the more pistons a brake caliper has is what makes a brake system superior to others which is not always true. When deciding on the proper application many factors need to be taken into account when choosing the most optimal brake system for your car.

Brake systems are often designed with a particular goal in mind, and the type of use it will go through. Braking systems are designed to operate the best within a prescribed temperature range so having a rotor disk too large will limit its temperatures to the extreme lower end of a pads temperature range and not allow it to reach the optimum range and also create unnecessary weight. Reducing the weight of any braking system will reduce the amount of unsprung weight and improve suspension performance, which will in turn result in enhanced ride and handling. There is a point when too big actually decreases overall braking performance.

Factory brake systems often come with floating brake calipers that have a single piston on the inboard side, or fixed calipers that have a single pair of pistons flanking the rotor disc both of which are inexpensive to manufacture and generally heavy. These types of braking systems are no match for high performance calipers that have multi piston or pairs of pistons that are mounted on opposing sides of the rotors which increases the clamping force of the caliper. As the rotors heat up the clamping force of the pistons need to be increased in order to avoid brake fade. Differential bore calipers use smaller pistons up front, and larger pistons toward the trailing edge of the caliper to help increase overall braking power and eliminate pad taper.

Brembo is one of the leaders in braking systems technology currently operating in 16 countries and has a long partnership with Race Technologies who serves the automotive performance and racing community. Race technologies is the sole U.S. Importer for Brembo High Performance, and official importer for Brembo Racing. The partnership between Race Technologies and Brembo lead to the development of the Gran Turismo, or “GT” Braking system which was designed and engineered entirely by Brembo.


The GT systems is the most popular high performance brake system for the street and track. The brake calipers come with opposed piston calipers, as well as 2 piece discs that increase thermal capacity that will reduce overall brake fade. Brembo system’s come delivered with preloaded calipers that are equipped with unique pad retaining features and sequential piston bores in order to provide even pad wear and provide optimum performance.

Brembo calipers also feature quick release pad retaining system that incorporates anti-rattle feature (pictured) to eliminate noise, and designed for quick and easy pad changes for the track for the weekend track enthusiasts.


All Brembo calipers also come with mounting brackets designed vehicle specific and are precision milled from superior quality billet materials to ensure a precise fitment and meet and exceed industry strength requirements of high performance driving conditions.



The Brembo GT kit can be ordered with three different rotor options that are all 2 piece in design as as made with superior metallurgy and exceptional engineering that allows the discs to exceed the most demanding conditions. Some of the more important features of any rotor is the A) Annulus, B) disc width, C) air gap, and D) vane design.


A. Annulus: The distance between two concentric circles. Or the disc friction surface.


B. Disc width: The overall thickness of the disk itself.


C. Air Gap: The distance between the inner rotors, separated by the vanes.
Those are absolutely gorgeous!
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Old 01-03-2017, 11:05 PM   #10
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Default Brembo GT 6 Piston "HD" Kit by Race Technologies AKA Brembo

OP this is an excellent thread. Thanks for posting that info.

Last edited by JarHarms; 01-30-2017 at 04:09 PM.
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Old 01-30-2017, 04:09 PM   #11
JarHarms
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Default Brembo GT 6 Piston "HD" Kit by Race Technologies AKA Brembo

What is the kit p/n? Is this 1L3.8004A3 with the L frame caliper?

V- thank you Sir.

Last edited by JarHarms; 02-01-2017 at 06:04 PM.
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Old 02-01-2017, 03:01 PM   #12
SpeedMasterLee
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1L3.8004A5 that has been custom painted and decaled by Race Technologies.
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Old 08-20-2020, 07:56 AM   #13
Kostasdh
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Default Piston Sizes and pads

Fantastic post, really well written! ***128079;***128079;***128079;

I know this is an old post but I was searching for this kit and not much of information was available on the interballs.

What size pistons the L frame caliper uses? Also I could not find pads for the GT6 caliper with 65mm annulus only the 57.5mm and one smaller size.
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Old 08-20-2020, 01:27 PM   #14
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Good bump too!
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Old 11-30-2020, 07:05 PM   #15
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Default Pad info

I could use some info on the oem brembo 68mm annulus pads.

Thank you in advance!

Konstantinos
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Old 12-03-2020, 03:40 AM   #16
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to change pads on the RA and these does it slide horizontally out? It looks like theres enough room...just random question lol
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