C4 Zr1 to C6zr1 brakes

[1LEZ]

I am currently installing C6 Zr1 brakes on my 1990 Zr1. I was hoping that the C4 to C6 Z06 apapters would work but they impact the C6 Zr1 caliper. My next move is to try C6 Z06 steering knuckles on my car. This brake conversion works on a C5 by changing to the C6 z06 knuckle so that is what I am trying. It looks observationally like the C6 Z06 knuckle should fit but.. the wheel hub isn't the same which leads me to believe I should install the C6 Z06 wheel bearing/hub. The problem with this is, does the wheel speed sensor for the C6 Z06 acquire data in the same way as my 1990 Zr1? Are the reluctors the same?

Any help in anyway is greatly needed and appreciated.

[Locobob]

I saw someone on one of the FB Corvette groups putting C7 Z07 brakes on his Z, from what I gathered he didn't use an adapter but just ovaled the existing bolt holes and the calipers bolted right up, the rotors needed to be shimmed a little to fit properly, not sure if he's a member here but he should be. Anyhow if those go on that easy it would seem like the way to go for a monster brake upgrade.

[1LEZ]

Yeah I saw that. The C7 Z06 caliper is not the same as the C6 ZR1 caliper although it would appear so at first glance

[WVZR-1]

I am currently installing C6 Zr1 brakes on my 1990 Zr1. I was hoping that the C4 to C6 Z06 apapters would work but they impact the C6 Zr1 caliper. My next move is to try C6 Z06 steering knuckles on my car. This brake conversion works on a C5 by changing to the C6 z06 knuckle so that is what I am trying. It looks observationally like the C6 Z06 knuckle should fit but.. the wheel hub isn't the same which leads me to believe I should install the C6 Z06 wheel bearing/hub. The problem with this is, does the wheel speed sensor for the C6 Z06 acquire data in the same way as my 1990 Zr1? Are the reluctors the same?

Any help in anyway is greatly needed and appreciated.

Spindles/knuckles - hub/bearing isn't going to work - 'NO WAY' everything is different.

** The modification mentioned to bolt on the C7 stuff 'directly' is scary. I didn't mention it there but I ain't ever seen 'elongated' mounting points for safety related stuff.

[Locobob]

The ovaling wasn't much according to the guy doing this, just a tiny bit so the bolts went in straight.
http://www.zr1.net/forum/picture.php?albumid=432&pictureid=3819


http://www.zr1.net/forum/picture.php?albumid=432&pictureid=3820

[Locobob]

OP, you might try contacting KORE3 to see if they have any ideas for you, they do a lot of brake conversion stuff including adapter brackets. I talked to them some years ago about doing a conversion and they seemed pretty sharp.




http://www.kore3.com/

[1LEZ]

Update.

With some minor caliper modification (milling some inordinate material off the calipers) everything has bolted up with no need to try and use a C6 knuckle. *I don't think I am completely out of the woods yet but I THINK I have leaped the biggest hurdles. *I will post pics and updates when I am closer to being completed. *Thanks all for your help and input!

[Jagdpanzer]

Great mod, keep us posted


Sent from my iPhone using ZR-1 Net Registry (http://r.tapatalk.com/byo?rid=90383)

[1LEZ]

Will do

[1LEZ]

Updates. Both front and rear calipers had to be milled to accept the C6 Z06 adapters. Also a universal parking brake kit had to be slightly modified to work with this set up as well. Hopefully another week and I’ll have the car on the ground.I'm using C6 ZR-1 *wheels as a temporary solution until I can get Forgelines ordered.

[viper107]

so can we get the list of everything here thats needed with correct calipers (gm)front and rear and being able to use stock e brake? i have been reading everywhere going back and forth and my brain is tired please, thanks!

[XfireZ51]

Ttt.

[RC000E]

Since we are on the subject, I am upgrading my C5Z06 current brakes from C6Z06 over to C6ZR1 (full carbons), so I want to take my C6Z brakes and put them on my C4ZR1. I see vansteel has the front adapters, but what's the situation on the rears?

[XfireZ51]

Since we are on the subject, I am upgrading my C5Z06 current brakes from C6Z06 over to C6ZR1 (full carbons), so I want to take my C6Z brakes and put them on my C4ZR1. I see vansteel has the front adapters, but what's the situation on the rears?

Depends on whether u want to have e-Brake function. I have the Street Shop rear hub adapter for my Z06 brakes. Its an expensive but well made piece altho
looking at their website I?m not sure they make it any longer. May need to call them for a 1 off.

[RC000E]

Are we talking about this setup here? 3k dollars to convert to a C5 rear hub assembly? Tell me that's not the only way...lol. I'll be busting out the 3d scanner and making it myself if 3k bucks is my option

http://www.vansteel.com/index.cfm?fuseaction=shop.showItem&subgroup=1906&ID=4054

[XfireZ51]

Nope. I have a picture somewhere or u might search the forum for my thread on C6Z brakes. At the time I bought, it was $700.

[GOLDCYLON]

Depends on whether u want to have e-Brake function. I have the Street Shop rear hub adapter for my Z06 brakes. Its an expensive but well made piece altho
looking at their website I?m not sure they make it any longer. May need to call them for a 1 off.

I do as well. It's not offered anymore I believe you are right Dom they might do a special order is what "my cousins, sisters brother said "

However you have to call them. Not sure if the Mr. Parker mod is being done anymore as well.


Key point here is anything can be made to fit with fabrication, milling, massaging and swapping. However it would take having a car like the OP in my garage before I would even consider doing anything like that. GC.

To the OP is the goal to use the C6 ZR1 rotors as well?

[XfireZ51]

I do as well. It's not offered anymore I believe you are right Dom they might do a special order is what "my cousins, sisters brother said "

However you have to call them. Not sure if the Mr. Parker mod is being done anymore as well.


Key point here is anything can be made to fit with fabrication, milling, massaging and swapping. However it would take having a car like the OP in my garage before I would even consider doing anything like that. GC.

To the OP is the goal to use the C6 ZR1 rotors as well?

GC,

Trey was good enough to call me back regarding a question I had about adjusting eBrake using the Street Shop setup. I am looking to determine if I am adjusting it properly. It tightens up when I first adjust the cables underneath, but over time, the brake won?t hold as it did previously. Marc has installed a few of these but suggests he can?t seem to make it work properly either and now defaults to a Wilwood setup for the eBrake. Trey told me that they don?t use C4 suspension etc any longer on their retro-mods instead concentrating on C6 and 7 gear. I guess much more available. However, he did say that the C4-C6 conversion is still available from Street Shop. They?re building a new website and do not have that item on current website. But u can call them for it.
He did encourage me to send him photos of my setup so we might be able to determine if I am doing something wrong. He told me that when they did use the C4 gear, SS installed the LOKAR setup w the Y block for the eBrake cables.

[-=Jeff=-]

GC,

Trey was good enough to call me back regarding a question I had about adjusting eBrake using the Street Shop setup. I am looking to determine if I am adjusting it properly. It tightens up when I first adjust the cables underneath, but over time, the brake won?t hold as it did previously. Marc has installed a few of these but suggests he can?t seem to make it work properly either and now defaults to a Wilwood setup for the eBrake. Trey told me that they don?t use C4 suspension etc any longer on their retro-mods instead concentrating on C6 and 7 gear. I guess much more available. However, he did say that the C4-C6 conversion is still available from Street Shop. They?re building a new website and do not have that item on current website. But u can call them for it.
He did encourage me to send him photos of my setup so we might be able to determine if I am doing something wrong. He told me that when they did use the C4 gear, SS installed the LOKAR setup w the Y block for the eBrake cables.


How much is their adapter now? I have an 87 setup I never installed but it would require relining the C4 shoes to be thicker to handle the c5 rotor/drum

[XfireZ51]

How much is their adapter now? I have an 87 setup I never installed but it would require relining the C4 shoes to be thicker to handle the c5 rotor/drum

Jeff,

I thought about ur setup and was going to ask about it. So u never installed it then. Don?t know the price of the adapter currently. It was $750 when I purchased it a number of years ago. Maybe we can chat about it over pizza Friday.
Is the c5 rotor 13? because it would need to be for the C6Z caliper.

[-=Jeff=-]

Jeff,

I thought about ur setup and was going to ask about it. So u never installed it then. Don?t know the price of the adapter currently. It was $750 when I purchased it a number of years ago. Maybe we can chat about it over pizza Friday.
Is the c5 rotor 13? because it would need to be for the C6Z caliper.

Dunno, I have a set of C5 rear calipers, C5 Rotors and that C4 Drum parking brake. I know the pads need to get relined to work, I ended up getting C4 calipers to work for the Parking brake so stopped the project

[GOLDCYLON]

GC,

Trey was good enough to call me back regarding a question I had about adjusting eBrake using the Street Shop setup. I am looking to determine if I am adjusting it properly. It tightens up when I first adjust the cables underneath, but over time, the brake won?t hold as it did previously. Marc has installed a few of these but suggests he can?t seem to make it work properly either and now defaults to a Wilwood setup for the eBrake. Trey told me that they don?t use C4 suspension etc any longer on their retro-mods instead concentrating on C6 and 7 gear. I guess much more available. However, he did say that the C4-C6 conversion is still available from Street Shop. They?re building a new website and do not have that item on current website. But u can call them for it.
He did encourage me to send him photos of my setup so we might be able to determine if I am doing something wrong. He told me that when they did use the C4 gear, SS installed the LOKAR setup w the Y block for the eBrake cables.

Yeah I'm using the Lokar setup as well Dom. Im also running Wilwoods all around.

[GOLDCYLON]

Dunno, I have a set of C5 rear calipers, C5 Rotors and that C4 Drum parking brake. I know the pads need to get relined to work, I ended up getting C4 calipers to work for the Parking brake so stopped the project

Has anybody checked if the Mr Parker mod is still available? Plenty of room in the rears for that baby caliper. However that's so old school. :cheers: