Dan, you mentioned about Emre? so ask him about Brembo opinion again please.

 

Dan, could you please paste here mail that you sent to me with all the instructions?
Ok, you have sent to Dominic but after we found the problem.....


btw this is message I have received from very well know guy here:

"Karol,

380mm gt brake kit is ****! it doesnt work well with our cars because of the "pre-filling system" on our brakes.

Do you know what that system is? Let me tell you, our brake system prepares our brakes when you de-press the throttle pedal.

Our car makes a little brake when you de-press the throttle fastly, it thinks that you are going to brake and it prepares the brake for that.

with the GT kit, i was driving on the highway, WITHOUT pressing the brake pedal, just accelerating and decelerating by leaving throttle..

After 10-15mins of acceleration, the car started to shake and make noise! when i press the brake it shaked even worse..

I felt like i used my brake for too long..

First i thought that there is air in my brake lines etc... i tried all. i couldnt find a solution for this.. even in my friends car..

so i wouldnt recommend using it, but maybe you have a different problem?"

 

Hello Karol,

I'm in Germany now, for the Essen Motorshow,

They are also aware of this problem here,

I think the reason of the problem;

OEM Pre-filling system has a low pressure to prepare the brakes,

but i think this Factory set pressure is high for the Brembo GT system, so it brakes more than requested,

thus the brakes get very hot, even if you dont use them...

I wasn't happy with the kit and sold it, but its up to you to decide.

Cheers,
Emre

 

they are aware of this problem in germany, but not in the US how obious it is....

 

Hi all,

I design brake systems for a living, some of which use the pre-fill system described above. I do NOT work for Brembo.

First off, I do not want to contradict what msv has said: it's all correct. Proper burnishing is critical to the functionality of high-performance brake systems, especially when using friction materials with transfer layers, such as those used in racing. All of the issues described in this thread can be traced back to an improper burnish.

That being said, electronic brake pre-fill systems add some complexity into the equation. In search of improved fuel economy (or electric range, as is the case with my current job) and better panic response, OEMs use pre-fill systems to raise system pressures before a standard power brake system could reach such pressures. The system is calibrated around a number of parameters, some of which have to do with the brake calipers. Specifically, the piston area, seal friction, and piston retraction (the distance the pistons move back after releasing the brakes) will all have an effect on the pre-fill system performance.

When calipers are changed, all of these parameters will change. I do not know the specifics of the Brembo GTR calipers, but I will assume that they have lower retraction and seal friction than the OEM Porsche calipers. This is typical for racing applications, where fast piston response is very important. Following this assumption, the pistons will thus run closer to the pads than the pre-fill system was calibrated for. In other words, the brakes will be applied more than Porsche wanted. This can cause all sorts of issues, depending on how Porsche is using the pre-fill system.

In summary, the OP should really pay close attention to properly burnishing the brakes. This will definitely improve the judder and fade problems he has experienced. However, there may also be problems from the pre-fill system, such as reduced fuel economy, over-sensitive brakes, brakes applying after releasing the gas pedal, and brakes running ‘hot’. Given the issues described here, I am 90% confident that the pre-fill issues are not the root cause of the problem.

 

The system in question is not a GTR system. These are not racing calipers. As Brembo also designs and produces the OEM system, there happens to be an in-depth knowledge of the workings of the OEM system, including the fluid absorbtion, piston rollback, etc. There is no fundamental flaw in the GT system that prevents it from working properly if correctly installed and bedded.

I have pointed out that Brembo goes to extreme lengths to inform the customer of what to do and what not to do when breaking in the system. The OP did PRECISELY what was specifically prohibited.

I've asked the OP to contact me in order to get him in touch with persons that will assist him in solving his problems, but he does not seem interested in doing that. I have posted here, and sent PM's with no results. He seems content to complain and insist that there is a product defect. Dan at Vivid Racing is also trying to assist him without luck.

At this point, I am going to leave this thread as there is no sense and only frustration in beating this particular dead horse.

If the OP would like help, he is still welcome to contact me.

 

ok, so here is about support from Dan:

"What do you want me to reply to? The xxxxxxxxxx thing is between you and yyyyyyy. I have nothing to do with it. I am not going to argue about products with you. Brembo is the best brake system out there and we have never had a issue with a Brembo brake system ever. If you are having a issue with the brakes now too, you might want to revisit who is putting the products on your car."

As I mentioned before I'm not alone with this issue, but not sure have you noticed?
I'm very disappointed, I also mentioned about other big kits I'm using Ap/PF and Alcon and I never had any problems at all !!!!! I newer did anything specific after brakes installation.
msv, I will send mail directly, thank you for your help offer, I just lost my hopes.

 

I undersand the frustration but dont understand the difference between what was called the "Big Brake" system and the GT system both mfg by Brembo. I had the Big Brake system on my Z06 while I see they know sell the GT system for Vettes, Cameros, Porsche, etc. Is this a new product line for Brembo overtaking the "Big Brake" system? If so I would assume there are "bugs" yet to be worked out, a very foolish mistake by Brembo if true. However, I still believe it is a burnishing problem.

 

shacking steering wheel is caused by burnishing problem ?

 

Yes.

 

and no brakes after 3 hard braking too???
btw what is the speed limit in the U.S????

here are the pictures of cracked pads:

 

one more, you can see how deep cracks are.

 

Yes.

Speed limits in the US vary by the region, they are anywhere from 90-130 km/h

 

Karol some folks here have given you the best advice they could possibly provide despite the limited amount of information you have posted. It would be helpful for you to provide:

1)specific kit you bought - description, part number
2)exact brake pad you are using
3)exact brake fluid you are using - if SRF when was it last filled? Racing brake fluids need to be changed more often than factory fluids
4)what type of driving - spirited, track, cruising on the freeway?
5)any warning lights showing up on the dash?
6)any odor/smoking from the brakes? Is there much brake dust being generated?

for right now it seems like you would be best to revert to stock until your problem is clearly identified and a definitive solution can be found

 

This thread truly amuses me. I read through ALL of the posts and being a long time member, I think it is CLEAR that this perhaps an install error and 100% error on the OP in not following the proper break-in (bedding) procedure. I think it is appalling that the OP has clearly not listened to ANY of the members that have tried to help and the worst part is that the OP just continues to complain again and again without really seemingly to try and solve the problem. I'm sure everyone else probably feels the same way as well...