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C6 GrandSport Brakes install

66679 Views 155 Replies 38 Participants Last post by  Choo
Figured I would throw up another thread for what I am getting into within the next few weeks.

I guess the car really didn't need brakes, then I got some killer deals on somethings and figured, oh well I guess I better just do it.

After talking with Tobin at Kore 3, great guy by the way, about the brake setup and I was going to modify to make work on my car, I decided to start hunting for a set of C6 Vette 6 piston fronts and 4 piston rears for calipers, 14 inch rotors in the front with 13.4 inch rotors for the rear.

No I was able to get a complete caliper set off a wrecked 2010 grandsport (same calipers as the Z06 silver instead of red) for pretty cheap and very low miles.

So I picked these up and began hunting down parts to see how cheap I could get away with doing this.

Here is a pic of the calipers.


I looked for sourcing of the rotors and I was going to go with Kore3, but I found a set of rotors for less than 1/2 the price of the rotors from Kore 3, no the machining for the 5 on 5 bolt pattern isn't done as well as the center bore needs to be opened up, but I have a local cnc shop that can handle that for me.

Here are the rotors that I got for the install, not GM but who cares really, as long as they work well, which they should. Hell he boxes with the rotors showed up today, the boxes with all four rotors was like 110 pounds total. I will shoot a comparison picture, old to new tonight when I go out and tinker a little bit with it. They are big, that is for sure.




I am going to have to figure out the parking brake setup as I am not going to pay 800 bucks alone for that setup, I am sure that I can figure that out.

So hopefully I can get this done rather quickly and not so costly, I think that I have most the parts, there are couple of things that I will get from Kore3, but I am truly on the fence about the hubs from them, not that they aren't great, I may just make my own from an old set of brakes, not sure yet.


Stay tuned.....
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Maybe I missed it, but how are you handling the axle float on the rear? C-Clip eliminators or just living with the axle knocking the pads back?
Good question, thought about c-clip eliminators but couldn't figure out how to make them work. The axle float is there, it is very minimal. Talking .020 or less, pad knock back maybe present , but the only thing that it may require is a residual check valve to keep tension/fluid on the pistons or as it was told to me there maybe times that I would have to pump the brakes to get a full force stop. I have yet to drive the car yet, still buttoning things up, but I don't think that it is going to be that drastic as Tobin @ Kore3 would of mentioned this. The kit that he developed, which is essentially what I have with some things that I purchased separately and the use of the factory parking brake, doesn't eliminate the C-clip or anything like that. I guess I will just have to see what I come up with when I test drive it. With a fully adjustable proportioning valve in the new master cylinder, I am sure that I am going to have to tweak it a bit, but once dialed in it should be great.

I think that I saw a Baer kit or something where they add shims to the c clip to eliminate the float, maybe an option as well. I will have to post up my findings when I have them
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I think that Todd at TCE uses shims to minimize the float in his rear kits which utilize the fixed Wilwood calipers. His site mentions getting the float down to .006-.008".
I think that Todd at TCE uses shims to minimize the float in his rear kits which utilize the fixed Wilwood calipers. His site mentions getting the float down to .006-.008".
Yeah now that you say that I think that is where I saw that at. I will just have to see what it comes out as and if there is a huge affect on it. Thanks for the info.
ok I was curious so I went out really quick and did a measurement with gauge and axle end play on my car is about .009, which isn't bad, I don't know why I thought it was more. I will have to see if I can get a shim kit somewhere, just in case they have them now and won't have them later
Whoa. Haven't been on this thread in a while. Outstanding work
Thank you sir, hopefully dumping some brake fluid at it tonight to see if I have any leaks :)
Well dumping brake fluid did just that. The f'ing master cylinder I bought used it pissing out the back of it where the plunger is, I just sent an email to the ass hole I bought it from chewing him out, oh well I will order a brand new one this weekend and it will be here Tuesday, then bleeding some more. I think that I am going to inject the fluid into the now bone dry lines and calipers, at least I would think that it would make bleeding easier.
Thank you sir, hopefully dumping some brake fluid at it tonight to see if I have any leaks :)
Nice!
Another master cylinder is on order should be here Tuesday as I stated above, probably tomorrow sometime I am going to go out and get fluid in the system, probably just inject it in there and bleed it after I get the master cylinder in.
Nice work. Finally, some big brakes to go with the big wheels. My question, though, is this; the rear calipers bolt on to the axle flange and don't move around at all, why do you need braided brake lines back there? I would figure all you need is just a steel line, maybe bend a 180 in it to handle any flex due to heat expansion and movement as the suspension moves around a bit, but could you have saved more ca$h by eliminating the braided hose at the rear calipers?

Just wondering. Thanks.
Nice work. Finally, some big brakes to go with the big wheels. My question, though, is this; the rear calipers bolt on to the axle flange and don't move around at all, why do you need braided brake lines back there? I would figure all you need is just a steel line, maybe bend a 180 in it to handle any flex due to heat expansion and movement as the suspension moves around a bit, but could you have saved more ca$h by eliminating the braided hose at the rear calipers?

Just wondering. Thanks.

always a flex line to a caliper, saves having to break open/bleed the system if the caliper has to be pulled off the rotor for brake jobs or axle work.
Ahh, THAT'S why. Thanks for the reply.
Thanks and yes Pogo is spot on :) And really I didn't reinvent the wheel with this installation, just went my own way about getting it done. Kore3 has made this kit for sometime now. well they have their own parking brake assembly, I made that portion or at least figured out an option for us anyway :)
Ok progress. After making all of the lines in my car I only had one fitting that was being a bastard and leaked a little bit, loosened it and tightened back done, I will have to go out and check it again today. Should be good though, system builds pressure nicely now after getting new master cylinder and pressure bleeding it. The CPP MCPV1 units, like I installed are notorious for being bastards to bleed, but what is cool with the MCPV it comes with a cap that is used for a remote reservior setup, so it has 1/8th inch fittings embossed into it, so I went to my local Lowes and made a pressure bleeder using this. Basically, purchased a 1 gallon garden sprayer, some 1/4 inch clear tubing, a pressure gauge and some fittings. For about 20 bucks I have a pressure bleeder for my set that works unbelievable. Pump it to about 10 psi, you shouldn't need anything over that and go to every bleeder and attach line to a bottle, crack bleed and fluid comes out, as easy as that. So much easier than anything else I have ever used. Plus the great benefit of this besides the cost is the fact the only thing that you have to do is make sure the pressure stay up a little, I think that I only pumped it up once, but I did inject fluid in to the lines and calipers to keep from having to bleed the system all that much more.

Anyway after all the bleeding, great pedal pressure in the air and all that, I will update further once I am able to drive it, that willl be sometime though. I have another large project coming in here shortly that is going to take up quite a bit of time.

I had purchased new parking brake cables from Mike @ hamilton and they are perfect, but when GM replaced the cables with some different number, they discontinued the equalizer (the place where you adjust the parking cable tension.) so I got a hold of Mr. Harper and he had a set, so I got the complete set from him. Guess what the parking brake works PERFECTLY :)

I will post up some pics here in a bit, I think that I am going to set it on the ground today sometime, just cause I want to see what the new rims are going to look like. :)
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I had purchased new parking brake cables from Mike @ hamilton and they are perfect...
I had to read that a couple of times. As I followed this thread I thought you were Mike (94MSP9C1) from Hamilton Chevy. cwm5:confused: Whoops.
Yeah we are two different guys, same first name, and user names are close as well. Sorry
Nothin to be sorry about :), I just find it odd how long it took me to figure it out.
Wow.
Big brakes for big cars.

More pics plz! :)
Awesome work man!!
Wow.
Big brakes for big cars.

More pics plz! :)
Awesome work man!!
What other pictures would you like to see? Haven't driven the car yet, too much other stuff going on, was going to do more this weekend, but my dad decided to drop into town from South Carolina with no notice LOL. So that is on the back burner. Everything is in though, brakes are bled, may need one more bleed though. Remember I didn't reinvent the wheel on this install by any means, Kore3 built a kit and still does for that matter that you can buy tomorrow. I just did a little development on the rear aspect of the installation, to find another option for the parking brake and two move the calipers to the front of the axle as they are on a vette. :)

Here is a pretty good side shot of the car for you.
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