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Old 11-06-2008, 09:26 PM   #1
CaptianSam
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heres a question

why are the rear rotos bigger than the fronts...

there cant be too many cars like this... if any at all...
i know the rears will be thinner... but wouldnt bigger rear brakes make for more...uhh rear slide i guess...??
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Old 11-06-2008, 09:28 PM   #2
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Didn't know they were. Good question
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Old 11-06-2008, 09:31 PM   #3
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my guess is because the rear tire is fatter but it dtill doesnt make sense to me... on my 350 the fronts were 255 and the rear were 285 and the front rotors were still 14 and the rears were like 12.4
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Old 11-06-2008, 09:32 PM   #4
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Corvette is the same way, however, the rear wheels are an inch larger as well.
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Old 11-06-2008, 09:40 PM   #5
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Maybe since the tires being an inch bigger calls for an inch bigger rotor?

Or maybe the bigger rotors give more surface area for the pads to press on..

more surface area=more friction
more friction=faster breaking
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Old 11-06-2008, 09:46 PM   #6
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dude... bigger tires in the rear were on the corvette
not the camaro ...
and friction = heat... more friction more heat the idea is to limit heat while maintaining prolonged useful stopping distance (ie racing)

the camaro has 20's all around
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Old 11-06-2008, 09:50 PM   #7
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dude

More surface area would also help spread the heat out so it wouldn't be as concentrated in one spot. You asked the question.. I gave my idea.
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Old 11-06-2008, 09:53 PM   #8
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well that clearly goes against every physical science law
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Old 11-06-2008, 09:54 PM   #9
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either way thats not the point... the point is why is there a bigger rotor in the back than the front... on every other car its the other way around
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Old 11-07-2008, 12:58 AM   #10
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Ok, they are the same diameter but different width's. The fronts are smaller than the backs. This is to give better handing control. Less area touching the ground means less friction to overcome when turning. The opposite is the case for the rear. Wider tire means more friction which means more traction to handle all that power!!
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Old 11-07-2008, 01:29 AM   #11
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Ok, they are the same diameter but different width's. The fronts are smaller than the backs. This is to give better handing control. Less area touching the ground means less friction to overcome when turning. The opposite is the case for the rear. Wider tire means more friction which means more traction to handle all that power!!

No they're not. The fronts are 14" diameter, the rears are 14.4".

If you look at the rotors themselves, there is less actual swept area on rotor by the caliper. Brake bias is tuned in the hydraulics anyways.

Anyhow, I'm pretty sure the rear rotor is larger to incorporate the parking brake assembly, which I believe on the CTS-V (the Camaro looks to be getting that setup) was inside the rotor hat. I can assure you it has nothing to do with tire width. Don't believe me? Look at the C6Z.
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Old 11-07-2008, 05:23 AM   #12
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Do you like the way it looks???? Good, thats why. Its purely for appearance. Thats a quote from GM at Indy.
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Old 11-07-2008, 05:55 AM   #13
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Do you like the way it looks???? Good, thats why. Its purely for appearance. Thats a quote from GM at Indy.



GM needlessly gave themselves more engineering costs for a larger rear brake rotor for looks? I doubt it.
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Old 11-07-2008, 07:38 AM   #14
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I doubt you are going to tell the .4 difference in the rear. Why did GM do this? Who knows, but I doubt it will affect stopping performance one way or another ..

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Old 11-07-2008, 07:41 AM   #15
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any good pics of this??
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Old 11-07-2008, 08:20 AM   #16
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I have a theory why the backs are "bigger". In my VW the rear pads wear at a rate of 2 to 1 compared to the front. The opposite of most cars. I think it has to do with weight transfer. Porsches stop VERY well partly because of all the weight being as far back as you can get it. It balances braking more having the car hunker down, as opposed to nosing down in front. Nosing down and transfering more weight to the front has a negating affect on the rears. This causes stopping distance and stability issues. On a motorcycle, instructors will tell you to brake with the rear first (marginally sooner) then brake 70-80% with the front, it settles the bike and provides for stability. It is just a theory, and it makes sense based on the laws of physics.
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Old 11-07-2008, 10:02 AM   #17
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Does anyone know if the Camaro uses EBD (electronic brakeforce distribution)?

http://www.obd-codes.com/faq/ebd-explained.php
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