FAQ | Brembo GT & GT-R System
Frequently Asked Questions (FAQ) for the Brembo High Performance GT & Gt-R Brake Application
1. What are the benefits and features of the Brembo GT Brake System?
• Designed Vehicle Specific
• Race-based components
• One or two-piece drilled and/or slotted discs
• Billet aluminum hats
• "Floating" disc mounting system
• 2, 4, 6, or 8-piston cast aluminum calipers
• High Performance friction material
• Can be used on the street at drivers' schools and at club events.
• Proven on-track performance at the highest levels of racing.
• Disperses gasses, cleans pads for better "bite."
• Reduces "unsprung weight" for better handling.
• Provides maximum braking force without the flex of sliding calipers.
• Reduces heat-related stress, increases brake performance and pedal feel.
• Aggressive pads that last longer and provide the highest level of performance.
• Designed to work with the vehicles stock master cylinder and ABS.
2. Will I experience brake noise with Brembo brakes?
Brembo makes every effort to test for and eliminate abnormal brake noise from the systems we offer. There are many factors that can contribute to abnormal brake noises, and while it is unlikely that a Brembo system will create noise, the engineering and customer service departments are available to answer questions and work to solve any noise issues which may arise.
3. What is the difference between the different systems Brembo offers?
Brembo offers different levels for different applications, and for different budgets. There are currently three performance levels within the Brembo program. The first level is the Sport system. These kits include cross-drilled or slotted discs and high performance brake pads, and are direct replacements for the OEM components. The second level, the Gran Turismo system, upgrades the entire corner brake assembly. These kits combine fixed mount, 4, 6, or 8-piston aluminum calipers equipped with high performance brake pads, one or two piece directionally vented discs, and steel-braided brake lines. For those seeking a system for exclusive or nearly exclusive track use, the Race systems offer upgrades consisting of true racing components.
4. Should big brakes be installed on the front wheels or all four?
During braking, the front of the vehicle does the majority of the work. Exactly how much is influenced by the vehicle's weight distribution, wheelbase, and center of gravity. Brembo engineers all of its systems to ensure that the brake balance of the vehicle is not compromised. If designed properly, adding a big brake system to the rear of the vehicle can result in improved thermal capacity, modulation and control of the vehicle. Brembo offers properly biased rear brake systems for a large number of high performance applications.
5. Are Brembo calipers directional?
Brembo's calipers are directional, due to the use of sequential piston sizes. The leading pistons are smaller in diameter in order to combat uneven wear of the brake pads. Upon close examination of the caliper, you will find a small arrow cast in place which denotes the direction of disc rotation. Additionally, when mounted on the vehicle, the bleed screw(s) must be at the top of the caliper
6. What brake pad materials are available?
The pads that are provided with Brembo brake systems are high performance pads that offer a very broad temperature and performance range. The pads are effective at cold temperatures as well as the higher temperatures seen during performance driving. These pads are suited to high performance street driving, and limited track usage. If the vehicle is going to be used predominantly on the track or if you wish to change brake pads when driving on the track, please contact Brembo for recommendations on alternate friction materials, and the trade offs relating to their use
7. Which direction should the discs rotate?
It is a popular misconception that the slots or drillings in a disc determine the direction of rotation. In truth, for an internally vented disc, the geometry of the vanes dictates the direction of rotation. There are three vane types in use:
• Pillar vane (comprised of many small posts)
• Curved vane
The first two vane types are non-directional, and can be used on either side of the vehicle. The curved vane disc, however, is directional. A curved vane disc must be installed with the vanes running back from the inside to outside diameters in the direction of rotation. Orienting the disc in the manner creates a centrifugal pump. The rotation of the disc causes air to be pumped from the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the disc's ability to dissipate heat.
Additionally, all of Brembo's slotted discs are directional as well, regardless of the vane geometry. The discs should be installed such that the end of the slot nearest the outer edge of the disc contacts the pad first.
8. How long do Brembo discs last?
The useable life of a brake disc is influenced by a number of factors including vehicle weight, driving style, vehicle usage, brake pad material, and many others. Therefore a blanket disc lifetime cannot be given. However, when used in the same conditions, a Brembo disc should meet or exceed the life of the disc it replaces. It is important, however, to periodically check the disc thickness, and replace the disc if it falls below the minimum allowed thickness
9. Should new discs and pads be bedded in and if so, how?
The answer is yes, for optimum performance, any time different friction materials or discs are introduced, a bedding procedure should be carried out.
10. Why are there so many holes in a cross-drilled disc?
The number of holes in a cross-drilled disc is part of the engineered system. Brembo has done extensive testing with regards to the number of holes, their size, their location and their chamfering. This attention to detail is what truly sets Brembo apart in the world of braking. The same attention to detail that is delivered to the Ferrari Formula One effort is a component of the high performance program. The number of holes in a disc is in part a function of the size of the disc and the internal venting (if it is a vented disc).
11. Why use drilled or slotted discs?
Drilling or slotting discs aids the disc in several ways:
The edges of the slots or holes continuously clean and refresh the pad surface as well as providing increased brake "bite". Additionally, they prevent gasses from collecting between the pad and disc interface.
The disc is lightened, thereby decreasing its rotational inertia.
12. What are the advantages of drilled and slotted discs?
The main advantages of drilled and slotted discs are the same: increased brake "bite", and a continuous refreshing of the brake pad surface. Drilled discs have the additional advantage of being lighter and running cooler however there are certain pad materials that should not be used with a drilled disc.
13. Will it work with my standard master cylinder, ABS, or traction control?
Brembo brake systems are designed to work with your standard master cylinder, and do not hamper the function of your ABS or traction control system
14. Why use a two-piece "floating" disc assembly?
There are several reasons that a two-piece floating disc assembly is of benefit. First, by using an aluminum bell for the hub section of the disc saves a great deal of weight. Since this is both rotating and unsprung, it benefits the acceleration, braking, and handling of the vehicle. Secondly, it is better able to handle the large temperature changes that a brake disc experiences. In a two-piece floating disc assembly, the iron disc heats up uniformly, and the controlled float which is present allows for the differential expansion of the very hot brake disc, and the relatively cool aluminum bell. This allows the disc to be used under severe conditions without having a detrimental effect.
Some of the bushings in the two-piece disc assembly seem to be loose.
The two-piece disc assemblies utilize a floating disc. The mounting system of the disc is designed to allow a specific amount of float in both the radial and axial directions. Brembo has engineered special springs that are used on every other fastener in order to slightly preload the assembly. This has been done to prevent excessive noise from the system during street use, while still maintaining the benefits of a floating disc. These springs can be seen when looking at the backside of the disc. The small screws on the backside of the disc are properly torqued during assembly and utilize thread lock compound to prevent loosening. They must not be tightened further.
15. Is the biggest brake disc the best answer for my vehicle?
Not necessarily. There are many factors to take into account when choosing a performance brake system. First and foremost, a brake system must be designed based on the vehicle parameters, and the type of use it will experience. Brake systems are designed to operate best within a prescribed temperature range. While modern high performance friction materials broaden this temperature range from relatively cold pad temperatures to the high temperatures experienced in performance driving situations, the use of a disc that is too large will limit disc temperatures to the extreme lower end of this range. Not only will the disc temperature not reach the optimum range, but it will also be heavier than necessary. Below you will find an explanation of how reducing the weight of the braking system further enhances performance.
16. What is brake torque?
Brake torque is essentially the power of the braking system. The brake caliper acts on the disc at a certain distance from the hub center, known as the effective radius. The force exerted by the caliper, multiplied by the effective radius of the system equals the brake torque. Increasing either the force applied by the caliper, or the effective radius results in increased brake torque.
17. How does reducing weight of the braking system benefit the vehicle?
The mass of any vehicle requires energy to accelerate or decelerate. Reducing the vehicle mass improves acceleration, and requires less energy to be dissipated during deceleration. Rotating mass requires additional energy in order to increase or decrease its speed of rotation. Therefore, decreasing the mass of the caliper is valuable due to its contribution to total vehicle mass, and decreasing the mass of the disc has an even greater benefit due to the fact that it must rotate as well. Additionally, the mass of the brake system is also unsprung mass. Reducing the unsprung mass has the additional benefit of improved suspension performance, resulting in enhanced ride and handling.
18. How long does it take to install a Brembo system?
Most 2-wheel applications take only 2-3 hours to complete.
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