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      10-12-2011, 11:44 AM   #1
mstevens
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Are 35iS brakes actually larger than 30i brakes?

I've tried to figure this out definitively using the bmw websites but haven't been able to:

Are the brakes on a 35iS actually larger than those on a 30i?
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      10-12-2011, 04:39 PM   #2
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yes, just like they are bigger then 35i
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      10-12-2011, 08:27 PM   #3
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i think this is the fourth time i've posted this...
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File Type: pdf Specifications_BMW_Z4_sDrive35i_sDrive35is_03_2010-1.pdf (70.1 KB, 894 views)
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      10-12-2011, 08:33 PM   #4
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Quote:
Originally Posted by Memphis1 View Post
i think this is the fourth time i've posted this...
+1
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      10-12-2011, 08:43 PM   #5
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Quote:
Originally Posted by Memphis1 View Post
i think this is the fourth time i've posted this...
Yeah, and I have downloaded it at least once, thanks

But the OP asked about the 30i compared to the 35iS, and this just shows that the 35i and 35iS have the same size brakes.
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      10-13-2011, 12:20 AM   #6
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Quote:
Originally Posted by bjarne View Post
But the OP asked about the 30i compared to the 35iS, and this just shows that the 35i and 35iS have the same size brakes.
. . .but somebody said the 35is brakes are larger than the 35i.
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      10-13-2011, 12:32 AM   #7
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Quote:
Originally Posted by Memphis1 View Post
i think this is the fourth time i've posted this...
Thanks for posting this! I saved it this time. I was wondering what the brake sizes are. I am planning to switch to Brembo brakes sometime next spring.
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      10-13-2011, 05:14 AM   #8
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Quote:
Originally Posted by ZheHbKa View Post
yes, just like they are bigger then 35i
Wrong!
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      10-13-2011, 10:05 AM   #9
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Quote:
Originally Posted by Memphis1 View Post
i think this is the fourth time i've posted this...
Thanks, but do you have such a thing that compares the 35iS with the 30i?

I need to buy new winter wheels and I'm being told stuff that I have trouble believing about what will fit and what won't. For example, I've been specifically told that "there is no possible way" my old wheels will fit even though they spent several months on the car last winter with no problem.

Tirerack.com lists a number of 17" wheels for the 30i, and I'd much prefer to use smaller wheels and have more sidewall for my winter tires. However, they insist the smallest that will fit a 35iS is 18". I need to use the old winter wheels on the e85 Z4 for which they were bought. Thus the question about brake sizes.
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      10-13-2011, 10:38 AM   #10
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Quote:
Originally Posted by mstevens View Post
Thanks, but do you have such a thing that compares the 35iS with the 30i?

I need to buy new winter wheels and I'm being told stuff that I have trouble believing about what will fit and what won't. For example, I've been specifically told that "there is no possible way" my old wheels will fit even though they spent several months on the car last winter with no problem.

Tirerack.com lists a number of 17" wheels for the 30i, and I'd much prefer to use smaller wheels and have more sidewall for my winter tires. However, they insist the smallest that will fit a 35iS is 18". I need to use the old winter wheels on the e85 Z4 for which they were bought. Thus the question about brake sizes.
Maybe if you dig deeper at realoem, you'll find the answer. They have different part numbers and I can attest that the calipers are different designs. I gave up, and just ordered an 18" winter setup (Sport Edition KM11) from TR

http://www.realoem.com/bmw/showparts...57&hg=34&fg=05

http://www.realoem.com/bmw/showparts...74&hg=34&fg=05
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      10-13-2011, 09:34 PM   #11
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Quote:
Originally Posted by Roadstergal View Post
Wrong!
On US spec cars, the 35i uses the same brakes as the as the 30i, and are both smaller
than the 35iS.

That is the way it is on my 35i, that is the way it is on realoem.
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      10-14-2011, 02:52 PM   #12
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Quote:
Originally Posted by Kief View Post
I gave up, and just ordered an 18" winter setup (Sport Edition KM11) from TR
Except for the size, those are the EXACT wheels I'd like to get.

Quote:
Originally Posted by Auraraptor View Post
On US spec cars, the 35i uses the same brakes as the as the 30i, and are both smaller than the 35iS.

That is the way it is on my 35i, that is the way it is on realoem.
How have you confirmed that your 35i brakes are the same size as on a 30i and smaller than a 35iS?

I'm sure everyone can see why I've been unable to find the definitive answer to this conundrum, since there are multiple supposedly correct answers floating around.

To make matters more confusing, since Tirerack lists 17" as an option for 30i and 35i without the sport package, that doesn't make sense unless a) they're wrong or b) 30i and 35i base share a brake size and 35i Sport Package and 35iS share a larger brake size. However, bmwusa.com doesn't say anything about brakes in the Sport package.
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      10-14-2011, 03:40 PM   #13
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Quote:
Originally Posted by Auraraptor View Post
On US spec cars, the 35i uses the same brakes as the as the 30i, and are both smaller
than the 35iS.

That is the way it is on my 35i, that is the way it is on realoem.
I cannot find anything that states that the 35is has larger brakes than a 35i. In fact to the contrary. Everything that I have ever read states the brakes are the same for both models. Am I missing something?
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      10-14-2011, 04:09 PM   #14
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Quote:
Originally Posted by Roadstergal View Post
I cannot find anything that states that the 35is has larger brakes than a 35i. In fact to the contrary. Everything that I have ever read states the brakes are the same for both models. Am I missing something?
I think the size of the brake discs are the same across the line, but the calipers on the 35is are a different design. I had a 35i before my 35is, and as I mentioned before, they are different. The caliper size is the reason why most 17" rims will not fit the 35is. See post 1 of the following link for pics of the calipers:

http://www.bimmerfest.com/forums/sho...ghlight=aussie
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      10-15-2011, 09:10 PM   #15
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Quote:
Originally Posted by Kief View Post
I think the size of the brake discs are the same across the line, but the calipers on the 35is are a different design
Wrong,
The 30i and 35i front rotors are 330X24 and the 35is rotors are 348X30.
Look it up on realoem.

http://www.realoem.com/bmw/showparts...75&hg=34&fg=07
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      10-16-2011, 07:26 PM   #16
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It's not a point of discussion, again, just look up the part numbers yourselves if you don't believe me, or go ask to cross reference the part numbers at your local dealer's parts counter.

So one more time, on US Spec cars, 30i and 35i have the same brakes all around. The 35iS gets larger brakes (calipers and rotors). On Euro cars, both 35i and 35iS get the larger brakes, for a myriad of reasons not relative to this thread.

How do I know? Well aside from being able to read that USspec 30i and 35i share the exact same part numbers for both the disks and caliper bodies, which is furthermore different than the 35iS model, I just went through and upgraded my factory brakes on my '10 USspec Sport and have the calipers + rotors sitting in a box in my garage. If that wasn't enough, I actually bought the Euro/35iS rears as they are larger than the 30/35i 300mm rears and have held both in my hand.

Key Point: Lay literature can (and is often) wrong, likely misunderstanding from the difference between euro and us-spec cars. To get the real info, take 5 minutes to browse the BMW part catalog. Its free, and online.

Quote:
Originally Posted by bmwmick View Post
Wrong,
The 30i and 35i front rotors are 330X24 and the 35is rotors are 348X30.
Look it up on realoem.

http://www.realoem.com/bmw/showparts...75&hg=34&fg=07
And there is some of the evidence I kept stating. Thank you for the link. Now if you don't believe the part numbers, again, feel free to go to your local parts counter and ask them. They will tell you 35i brakes are the same as 30i.

In full on US SPEC cars:

30 and 35i:
330mm front/ 300 mm rear disks

35is:
348mm front/324 mm rear disks

Both use different calipers as well. This is definitely true up to 2010. I have not browsed the 2011+ part numbers.

Last edited by Auraraptor; 10-16-2011 at 07:40 PM..
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