c4 to c5 brake conversion brackets
Thread Starter
Racer
Joined: Aug 2007
Posts: 305
Likes: 1
From: DRAYTON VALLEY ALBERTA
c4 to c5 brake conversion brackets
I know somewhere there was posted a cad drawing of this bracket. I have the caliper and rotors. I just need the brackets. I can build these. Can someone point me in the right direction.
Thanks
Thanks
Pro
Joined: Sep 2008
Posts: 694
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From: St James New York
Racer
Joined: Oct 2011
Posts: 417
Likes: 2
From: Blacksburg Virginia
You have an 85-87 so you need this bracket.
Note the 84s have two 12mm holes instead. Also you need to mill about 1/8" of thickness around two of the holes.
When its done it should look like this
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Burning Brakes
Joined: Nov 2005
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From: Hanover PA
I have a spare set from vettes @carlisle. Powdercoated brackets
with all grade 12.8 hardware. For 85-87 Send email address for pics.
$135 shipped
These also work with C6 base & Z51
with all grade 12.8 hardware. For 85-87 Send email address for pics.
$135 shipped
These also work with C6 base & Z51
Last edited by 76LS1BIRD; Jun 3, 2013 at 09:13 PM.
Drifting
Joined: Mar 2009
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From: East Wenatchee (2hours from n e where) WA
I got mine from Bird 
Team Owner
Joined: Sep 2003
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I believe that when you're talking about an early car that's wrong! There's way more C5 parts available inexpensively to accomplish the task. The C6 Z06 that you've mentioned a couple times for "most" isn't either practical nor inexpensive. With any of the brake changes wheels are required so there's considerations/restrictions that apply.
Race Director
Joined: Sep 2001
Posts: 14,686
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From: NEwhere Ohio
I believe that when you're talking about an early car that's wrong! There's way more C5 parts available inexpensively to accomplish the task. The C6 Z06 that you've mentioned a couple times for "most" isn't either practical nor inexpensive. With any of the brake changes wheels are required so there's considerations/restrictions that apply.
My c4 world is lt1+ so i dont know what it takes to upgrade an early car. I back out of this discussion
Le Mans Master
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From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
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St. Jude Donor '12
Racer
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From: Blacksburg Virginia
Team Owner
Joined: Dec 1999
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The J55 brakes were part of an optional suspension package until about 1994. The standard rotors were 12" but they did have dual piston calipers. The larger 13" brakes were standard on all cars at that point. ZR-1's came with the J55 brakes.
So
Team Owner
Joined: Sep 2003
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'87 and earlier "front" calipers are single piston and the C5 upgrade is actually the only upgrade that makes economical sense. There's way more parts available and for less $$'s as a rule. A few years ago that wasn't the case. If the C6 base/Z51 calipers were available for less then that might be the choice. The brackets I believe are the same as mentioned and I don't believe it changes the wheel restrictions.
OP - you're on the right track but unless you received something more technical than what's contained in the image in post #4 I'd maybe wait and do some research for dimensions or consider a buy from someone that offers a more professional approach to the brackets. I don't know that an eBay buy is a good buy either until researched well.
The early C4 bracket seems a bit over-priced but I guess that maybe volume has something to do with that.
Something to consider is also that in some states if an inspector sees something that is "non-stock" during a safety inspection it can cause a "failure to pass" - the better the quality of the "fit and finish" of the adapter hardware could make a difference. Sometimes "purdy" matters!
Last edited by WVZR-1; Nov 27, 2013 at 10:07 AM.
Intl Council of Corvettes
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From: Huntsville Alabama