Brake rotors
06-01-2007, 08:52 PM
#1
Race Car
Thread Starter
Brake rotors
What's the thickness of new front GT3 or Cup rotors? And what's the minimum thickness before they need to be replaced (assuming they're not cracked)?
Also, anyone ever used nonslotted and nonvented rotors? Pros & cons?
Also, anyone ever used nonslotted and nonvented rotors? Pros & cons?
06-06-2007, 07:56 PM
#2
Last year I ran slotted rotors and I got 28 track days out of them. They are not done yet either. The slots are gone but they were pretty shallow anyways.
My new rings are unslotted and I expect them to hold up even better with extended pad life also. If you track the car hard then the holes on drilled rotors
(stock or cup) will crack. All the talk about off gassing of pads or that the holes are for cooling. The holes are to accumulate brake dust and are another thing to clean all the time. As for non vented rotors; they need to be just as thick as the vented to work with your caliper so solid hunks of iron would double their weight to 50+ pounds per corner. they might not warp but they would never cool off. Cost savings on not replacing brake ducts? I recomend no slots or holes for heavy use. For cool looks go with the cup rotrors.
My new rings are unslotted and I expect them to hold up even better with extended pad life also. If you track the car hard then the holes on drilled rotors
(stock or cup) will crack. All the talk about off gassing of pads or that the holes are for cooling. The holes are to accumulate brake dust and are another thing to clean all the time. As for non vented rotors; they need to be just as thick as the vented to work with your caliper so solid hunks of iron would double their weight to 50+ pounds per corner. they might not warp but they would never cool off. Cost savings on not replacing brake ducts? I recomend no slots or holes for heavy use. For cool looks go with the cup rotrors.
06-06-2007, 09:43 PM
#4
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The front rotors are 34 mm. You never wear the out if you track. They die of cracks, is cracks join 3 or more holes or go to the edge of the rotor, they need to be replaced. Motorsport rotors are almost identical but far cheaper.
06-06-2007, 11:30 PM
#5
Burning Brakes
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Where is the best place to buy a cup rotors? Are the the most cost effective option if you track? Or, are there other brands to consider? I noticed http://www.jzmachtech.com has Alcons rotors. Is there any other options? Thanks guys.
06-06-2007, 11:55 PM
#6
Rennlist Member
Austin at TRG... Great guy. They are a Rennlist sponsor. I paid @$600 for a set of front cup rotors in March through them...
If you use Pagids with a high-end brake fluid (I use Castrol SRF) and also add the cup ducts for enhanced airflow, I think you will be just fine with the cup rotors. Alcons are expensive.
-B
If you use Pagids with a high-end brake fluid (I use Castrol SRF) and also add the cup ducts for enhanced airflow, I think you will be just fine with the cup rotors. Alcons are expensive.
-B
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06-07-2007, 10:59 AM
#8
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I just bought the Brembo 350mm slotted floating rotors and hats from Austin. He was great to work with and gave me a lot of info to help my decision. I'm going to keep the OEM drilled rotors on back and just replace the fronts. I am running Pagid 19's on front and 14's on the back.
06-09-2007, 12:35 PM
#9
Originally Posted by spare tire
Last year I ran slotted rotors and I got 28 track days out of them. They are not done yet either. The slots are gone but they were pretty shallow anyways.
My new rings are unslotted and I expect them to hold up even better with extended pad life also. If you track the car hard then the holes on drilled rotors
(stock or cup) will crack. All the talk about off gassing of pads or that the holes are for cooling. The holes are to accumulate brake dust and are another thing to clean all the time. As for non vented rotors; they need to be just as thick as the vented to work with your caliper so solid hunks of iron would double their weight to 50+ pounds per corner. they might not warp but they would never cool off. Cost savings on not replacing brake ducts? I recomend no slots or holes for heavy use. For cool looks go with the cup rotrors.
My new rings are unslotted and I expect them to hold up even better with extended pad life also. If you track the car hard then the holes on drilled rotors
(stock or cup) will crack. All the talk about off gassing of pads or that the holes are for cooling. The holes are to accumulate brake dust and are another thing to clean all the time. As for non vented rotors; they need to be just as thick as the vented to work with your caliper so solid hunks of iron would double their weight to 50+ pounds per corner. they might not warp but they would never cool off. Cost savings on not replacing brake ducts? I recomend no slots or holes for heavy use. For cool looks go with the cup rotrors.
06-09-2007, 01:01 PM
#10
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Originally Posted by spare tire
Last year I ran slotted rotors and I got 28 track days out of them. They are not done yet either. The slots are gone but they were pretty shallow anyways.
My new rings are unslotted and I expect them to hold up even better with extended pad life also. If you track the car hard then the holes on drilled rotors
(stock or cup) will crack. All the talk about off gassing of pads or that the holes are for cooling. The holes are to accumulate brake dust and are another thing to clean all the time. As for non vented rotors; they need to be just as thick as the vented to work with your caliper so solid hunks of iron would double their weight to 50+ pounds per corner. they might not warp but they would never cool off. Cost savings on not replacing brake ducts? I recomend no slots or holes for heavy use. For cool looks go with the cup rotrors.
My new rings are unslotted and I expect them to hold up even better with extended pad life also. If you track the car hard then the holes on drilled rotors
(stock or cup) will crack. All the talk about off gassing of pads or that the holes are for cooling. The holes are to accumulate brake dust and are another thing to clean all the time. As for non vented rotors; they need to be just as thick as the vented to work with your caliper so solid hunks of iron would double their weight to 50+ pounds per corner. they might not warp but they would never cool off. Cost savings on not replacing brake ducts? I recomend no slots or holes for heavy use. For cool looks go with the cup rotrors.
i warn against brembo floating rotors. incredibly noisy. i mean incredibly...
06-09-2007, 01:46 PM
#12
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I switched to Brembo floaters for my GT3 and had no issues except for the noise, which increased with the miles and ultimately became terrific, to the point that it sounded like something was shaking loose under the front of the car. I got terrific life out of the floaters compared to the Factory discs, 'cause there were no holes to cause cracks. When it was time, at the begining of this season, to replace the discs ( the slots were almost worn smooth), my mechanic advised that in his view, the holes in the hats had enlarged to the point that it would be unsafe to mount the replacement discs to them. I thought that perhaps he was being too conservative, so he shot a video of the play in them and sent the video to the dealer from whom I'd purchased the floaters and the replacement discs, who in turn sent the video on to Brembo. The advice that came back from Brembo via the dealer was that yes, there was too much play, and that the floaters were not suitable for street/track use because Brembo had designed the hats to have a life of 50 hours of driving! That was news to me, and to the dealer too. The dealer agreed to accept a return of the replacement discs for a 95% of purchase price refund and I've sent them back . I'm now looking for a set of non-floating slotted front discs. Does anyone out there have a recommendation?
Obviously, if I knew then what I know now I would not have purchased the floaters. The marginal cost savings over the life of the floaters (*** their hats) did not compensate for the racket of their noise, and I'm incensed that until the dealer heard from Brembo, the dealer didn't know about the 50 hours of use life of the hats. The dealer told me that they'd be good for at least two sets of discs!
Richard Bain
Obviously, if I knew then what I know now I would not have purchased the floaters. The marginal cost savings over the life of the floaters (*** their hats) did not compensate for the racket of their noise, and I'm incensed that until the dealer heard from Brembo, the dealer didn't know about the 50 hours of use life of the hats. The dealer told me that they'd be good for at least two sets of discs!
Richard Bain
Last edited by guykoken; 06-09-2007 at 02:01 PM.
06-09-2007, 01:56 PM
#13
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Originally Posted by ca993twin
My Brembo floating rotors are NOT noisy... depends on how tight those bobbins are, I suppose.
my was early version for GT3, not isolating springs, we got bobbins pretty tight and it sounded like my car was literally falling apart into pieces. perhaps the late models have been improved.
06-09-2007, 02:02 PM
#14
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Originally Posted by guykoken
I switched to Brembo floaters for my GT3 and had no issues except for the noise, which increased with the miles and ultimately became terrific, to the point that it sounded like something was shaking loose under the front of the car. I got terrific life out of the floaters compared to the Factory discs, 'cause there were no holes to cause cracks. When it was time, at the begining of this season, to replace the discs ( the slots were almost worn smooth), my mechnic adised that in his view, the holes in the hats had enlarged to the point that it would be unsafe to mount the replacement discs to them. I thought he was being too conservative, so he shot a video of the play in them and sent the video to the dealer from whom I'd purchased the floaters and the replacement discs, who in turn sent the video on to Brembo. The advice that came back from Brembo via the dealer was that yes, there was too much play, and that the floaters were not suitable for street/track use because Brembo had designed the hats to have a life of 50 hours of driving! That was news to me, and to the dealer too. The dealer agreed to accept a return of the replacement discs for a 95% of purchase price refund and I've sent them back . I'm now looking for a set of non-floating slotted front discs. Does anyone out there have a recommendation?
Richard Bain
Richard Bain
dont get me wrong, brembo's are great disks, but they do have some "issues".
i was told AP makes some fixed two piece that are quiet and long lasting though i have no personal experience on that.
06-09-2007, 02:57 PM
#15
Three Wheelin'
Originally Posted by guykoken
I switched to Brembo floaters for my GT3 and had no issues except for the noise, which increased with the miles and ultimately became terrific, to the point that it sounded like something was shaking loose under the front of the car. I got terrific life out of the floaters compared to the Factory discs, 'cause there were no holes to cause cracks. When it was time, at the begining of this season, to replace the discs ( the slots were almost worn smooth), my mechanic advised that in his view, the holes in the hats had enlarged to the point that it would be unsafe to mount the replacement discs to them. I thought that perhaps he was being too conservative, so he shot a video of the play in them and sent the video to the dealer from whom I'd purchased the floaters and the replacement discs, who in turn sent the video on to Brembo. The advice that came back from Brembo via the dealer was that yes, there was too much play, and that the floaters were not suitable for street/track use because Brembo had designed the hats to have a life of 50 hours of driving! That was news to me, and to the dealer too. The dealer agreed to accept a return of the replacement discs for a 95% of purchase price refund and I've sent them back . I'm now looking for a set of non-floating slotted front discs. Does anyone out there have a recommendation?
Obviously, if I knew then what I know now I would not have purchased the floaters. The marginal cost savings over the life of the floaters (*** their hats) did not compensate for the racket of their noise, and I'm incensed that until the dealer heard from Brembo, the dealer didn't know about the 50 hours of use life of the hats. The dealer told me that they'd be good for at least two sets of discs!
Richard Bain
Obviously, if I knew then what I know now I would not have purchased the floaters. The marginal cost savings over the life of the floaters (*** their hats) did not compensate for the racket of their noise, and I'm incensed that until the dealer heard from Brembo, the dealer didn't know about the 50 hours of use life of the hats. The dealer told me that they'd be good for at least two sets of discs!
Richard Bain