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post #1 of 7 (permalink) Old 30-09-2012, 17:02 Thread Starter
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Front brake disc thickness

I've recently bought a late Tomcat VVC and am looking to revamp the brakes. I always thought the later 'bubble dash' cars had a lot in common with the R3 200
and that the front vented brakes on the R8 200/400 cars were the same as the later R3 200 and HHR 400 cars. However it seems the vented discs on these later cars are 21mm thick whereas the equivalent R8 discs are thicker at 22mm. For some reason the thicker (by 1mm!) discs are coming out at nearly twice the price so has anyone used the 21mm discs on their R8 without detriment to the braking performance or am I asking for trouble?
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post #2 of 7 (permalink) Old 30-09-2012, 20:36
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Check the offset on the disc as I believe it is different too.
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post #3 of 7 (permalink) Old 30-09-2012, 20:42
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The wear limit on the 25 is 19mm. Thickness alone won't affect braking performance, but I would check the wear limit, and as above other dimensions may catch you out. I have [rarely though] seen the disk break away from the hub and at that point you loose all braking on that wheel. It takes some serious abuse to achieve that.
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post #4 of 7 (permalink) Old 30-09-2012, 21:22
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Quote:
Originally Posted by E_T_V View Post
Check the offset on the disc as I believe it is different too.
Yep, its 1-2mm different on the pre 96 R8's.

Hence the need to space the 282mm carriers on those cars. Going the otherway means grinding that mm off of them.

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post #5 of 7 (permalink) Old 30-09-2012, 22:20
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Why do car makers make these apparently minor alterations? I have come across a number of odd things in my time. The diff carrier bearings on the Maxi were MJ 1 3/8, one side was standard industrial size, the other was about 6 thou" smaller o/d and given a variation number something like 6 MJ 1 3/8.
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post #6 of 7 (permalink) Old 30-09-2012, 22:52
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In this case to move to the standard disks that would be shared with Honda for the Civic.

They don't do it for the sake of it. Parts costs is the usual driver.

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post #7 of 7 (permalink) Old 02-10-2012, 19:15 Thread Starter
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Thanks for the replies.

Looking over it again it seems the discs for the R3/HHR have a lower offset so using them on an R8 may mean the caliper doesn't fit over the disc correctly. I'm able to get a set of Pagid vented discs and pads from ECP for 54.45 using the .org discount which isn't bad as I was looking at that sort of money for Brembo OEM discs alone.

Bloody madness how it's not all compatible given how much the R8 has in common with the R3, the later cars especially.
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