C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

J55 brake pic please

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Old Sep 10, 2010 | 08:34 PM
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Default J55 brake pic please

Hi Guys,
I just got my J55 calipers, abutment brackets and DRM adapters for the 84 and I'm a little lost. I don't see what "attaches" the calipers to anything. Can someone post or e-mail me pics of what J55 brakes look like when assembled please?
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Old Sep 10, 2010 | 09:50 PM
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The biggest difference with the J55 is how they mount to the abutment bracket.

Make sure you load the calipers so the brake pad end with the notch is down.
Be sure the spring clips on the pad are ALL the way in the caliper, if not you will have a problem fitting them over the disk.
The closed end of the pad goes under the abutment bracket at the top.
At the bottom you slide a pin from front to back (or back to front) and secure it with an e clip.

If I get some time I'll post some pictures.
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Old Sep 10, 2010 | 09:52 PM
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Thanks! I was able to find a good side-shot and your explanation fills in the blanks. I had a feeling that was how they go together, but I don't have a set of pads yet to mock it all up.

It seems kind of spooky that an interference fit is basically all that keeps them together, but it obviously works.
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Old Sep 10, 2010 | 09:55 PM
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Originally Posted by mcm95403
It seems kind of spooky that an interference fit is basically all that keeps them together, but it obviously works.
The through pin holds everything together






I recall past posts stating you may have to clearance the original mounting tabs on the early spindles for the DRM adapters to fit correctly


Last edited by vetteoz; Sep 10, 2010 at 10:05 PM.
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Old Sep 10, 2010 | 10:49 PM
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Old Sep 10, 2010 | 10:53 PM
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Thanks for the info, I'll make sure to test fit them well before I do the swap.
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Old Sep 11, 2010 | 01:39 PM
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Originally Posted by vetteoz
The through pin holds everything together

I find it preferable to place the pin with the C-clip facing out. That way I can give it a visual check at tire changeover and if it works its' way out (happened to us a couple times) it won't hit a wheel spoke.

Cheers,
- Jeff
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Old Sep 18, 2010 | 09:50 PM
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Will these fit under 16" wheels, or do you need 17's?

Thanks.
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Old Sep 18, 2010 | 09:56 PM
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Will these fit under 16" wheels, or do you need 17's?

Thanks.
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Old Sep 19, 2010 | 12:34 AM
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17s if you want the J55 option.
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Old Sep 19, 2010 | 01:21 AM
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Originally Posted by 1985 Corvette
17s if you want the J55 option.

I saw several posts by people claiming these fit with the 16" wheels - do you know for sure that's wrong?
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Old Sep 19, 2010 | 03:03 AM
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Originally Posted by 1985 Corvette
17s if you want the J55 option.
Clear stock Enkei made 16" wheels fine
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Old Sep 19, 2010 | 08:53 AM
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Originally Posted by rodj
Clear stock Enkei made 16" wheels fine
Not in the front they wont .

Just checked mine . They dont say enki anywhere . and the were 16/8.5 inch wheels
So "rodj may be correct .

Last edited by Rob31; Sep 19, 2010 at 09:00 AM.
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Old Sep 19, 2010 | 10:13 AM
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Originally Posted by Rob31
Not in the front they wont .

Just checked mine . They dont say enki anywhere . and the were 16/8.5 inch wheels
So "rodj may be correct .


You need 17" wheels to clear the J55 (13"rotors).
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Old Sep 19, 2010 | 04:58 PM
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Originally Posted by PLRX
You need 17" wheels to clear the J55 (13"rotors).
I have J55's on my '87 and they clear the factory 16 X 9.5" Enkei made wheels fine.
Has been well documented here in the past, the other factory wheels ( General ??? ) are a thicker rim section and won't clear

Last edited by rodj; Sep 19, 2010 at 05:09 PM.
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Old Sep 19, 2010 | 07:28 PM
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Originally Posted by rodj
I have J55's on my '87 and they clear the factory 16 X 9.5" Enkei made wheels fine.
Has been well documented here in the past, the other factory wheels ( General ??? ) are a thicker rim section and won't clear
Are the Generals the 16"x8.5"?
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Old Sep 23, 2010 | 01:13 AM
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do i need an adapter plate to mount the J55 calipers on my 86? if so, where do i get it? i just bought a set of grand sport calipers. they came with the mounting bracket and the 13" rotors but i'm not sure, how to install these. i've been searching for solid answers for a few hours. this thread has got the closest to an answer, but i'm still not sure
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Old Sep 23, 2010 | 01:41 AM
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Originally Posted by aceesquire
do i need an adapter plate to mount the J55 calipers on my 86? if so, where do i get it? i just bought a set of grand sport calipers. they came with the mounting bracket and the 13" rotors but i'm not sure, how to install these. i've been searching for solid answers for a few hours. this thread has got the closest to an answer, but i'm still not sure

In my case I'm using discontinued DRM (Doug Rippie Motorsports) adapters. Since they're discontinued, I'm considering having them duplicated.

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Old Sep 23, 2010 | 05:07 AM
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Originally Posted by aceesquire
do i need an adapter plate to mount the J55 calipers on my 86? if so, where do i get it?
Yes
PM sent
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Old Sep 23, 2010 | 09:39 AM
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I tookmine off an 84 with the factory bracket . I had to use a washer from my single piston caliper for clearance on the rotor. Still had to grind a good .040off the bracket near the rotor.
I have a 86
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