C6 GrandSport Brakes install

66615 Views 155 Replies 38 Participants Last post by Choo, Nov 9, 2016

94MI9C1

Discussion Starter · Mar 13, 2011

2

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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81 - 100 of 156 Posts

Mr pogo

· #81 · Apr 11, 2011

I forget all the names but if youve done the two brake valve mods (stealth bolt and ???) you should be ok.

my abs conks out cuz of a intermittant open LF sensor Im too lazy to chase down.
I did a panic stop when a bimbo hooked a left in front of me when I was doing about 30, perfect front brake only lock up and stopped so fast I had probably 15 ft or more to spare

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94MI9C1

Discussion Starter · #82 · Apr 11, 2011

Yeah brake and metering Pogo, but I am changing things up as the master cylinder that I am going to use has the proportioning valve and metering all build into it, so the only thing that I will be using from the original brakes per say is the vacuum booster, everything is going to be new.

GA95DCMSS

· #83 · Apr 11, 2011

Todd TCE said:
Looking good. How's the spoke clearance with that shallow of a rotor? Guessing these won't clear the stock wheel regardless given the 14" right?

Funny thing, looking at Tobin's (Kore3) fitment templates, this setup is shorter in overall radius than the C5 hybrid setup (C5 PBR Calipers, 355mm rotor) by .41 inches (8.33" C5 Hybrid vs. 7.92" C6 Z06 Setup). Only one way to tell if It'll clear stock wheels. Measure the inside radius of one or just throw one on there for giggles!!

94MI9C1

Discussion Starter · #84 · Apr 11, 2011

GA95DCMSS said:
Funny thing, looking at Tobin's (Kore3) fitment templates, this setup is shorter in overall radius than the C5 hybrid setup (C5 PBR Calipers, 355mm rotor) by .41 inches (8.33" C5 Hybrid vs. 7.92" C6 Z06 Setup). Only one way to tell if It'll clear stock wheels. Measure the inside radius of one or just throw one on there for giggles!!

I would but I sold them to fund part of this build

Buffman

· #85 · Apr 11, 2011

94MSP9C1 said:
We drove hundreds of thousands of miles BEFORE they ever invented ABS and the cars were just fine so for a summer car with no snow and ice to deal with the ABS is just one butt ugly thing under the hood that needs to go when making the engine compartment nice for a show car. Not to mention that wiring mess under the dash and the little bit of weight savings as a side effect.

ABS and Line lock are just fine together. Install it after the prop valve, and you'll never have an issue.

Uploaded with ImageShack.us

I was just curious as to why, as with the size of the brakes, and with the use of sticky tires, I think you'll find yourself being able to lock up the wheels fairly easily, but that's just me.

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94MI9C1

Discussion Starter · #86 · Apr 15, 2011

Too late to turn back now I ripped the ABS out last night

I will post pics later just wanted to give an update, sorry for the delay on this, life is throwing some hurdles my way, I will get it done.

Navy Lifer

· #87 · Apr 22, 2011

GA95DCMSS said:
Funny thing, looking at Tobin's (Kore3) fitment templates, this setup is shorter in overall radius than the C5 hybrid setup (C5 PBR Calipers, 355mm rotor) by .41 inches (8.33" C5 Hybrid vs. 7.92" C6 Z06 Setup).

The C5/C6 PBR twin-piston floating calipers do typically have a higher "bridge" height--ie. radius--compared to a fixed-piston caliper. That is why a Wilwood or Movit front brake kit with a 13.5" or 342mm rotor can fit inside the OE Impala SS wheel, which isn't possible with the floating C5/C6 calipers--limited to the 325mm rotor.

The floating caliper requires more material in the bridge area to provide enough strength/stiffness to keep the pads parallel--which the design of fixed-piston calipers deals with in a different way, with a much lower bridge height.

etc.

· #88 · Apr 27, 2011

Bump!

94MI9C1

Discussion Starter · #89 · Apr 27, 2011

Yeah thanks.

Still working, having a couple of family issues going on at the moment so it has been put on hold. I will update when I get further, sorry for the delay, just time is very limited right now and one of my dogs isn't doing so well. I will update soon, promise

etc.

· #90 · Apr 29, 2011

You do what you have to do.

We'll still be here

94MI9C1

Discussion Starter · #91 · Apr 29, 2011

Yeah I know. I don't like to disappoint, but sh** happens I guess

More pics coming soon, promise.

94MI9C1

Discussion Starter · #92 · May 11, 2011

3

Ok the fronts are done and the master cylinder is mounted still working on the rears at present time, been fighting an aching shoulder so process has been slow for sure. Here are some phone pics for you.
Master cylinder

fronts

I should have the rear done in about a week or so, then fluid, bleeding and adapter order for my new wheels.

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heavybuick

· #93 · May 12, 2011

That setup looks like it belongs on there. Great work! I hope to run something similar in the future.

strokedimpala

· #94 · May 12, 2011

looks great Mike i havent even started on my master yet.Keep up the good work and be careful with that shoulder.
Paul.

94MI9C1

Discussion Starter · #95 · May 12, 2011 (Edited)

heavybuick said:
That setup looks like it belongs on there. Great work! I hope to run something similar in the future.

Thanks man, I have heard great things about the MCPV1 master cylinder that I put on there, since I was removing the ABS anyway figure why not get rid of the propotioning valve as well, since it is internal to the MCPV1. I ran all new lines, hand made as there wasn't a kit available, all 3/16's.

I really like the color combo of the calipers on my car, it matches

LOL

The rear is going to be I think on of the coolest parts, I am going to put the calipers on the front side instead of the rear, this will match how they are located on the vette's as well.

strokedimpala said:
looks great Mike i havent even started on my master yet.Keep up the good work and be careful with that shoulder.
Paul.

Thanks Paul, I have been ignoring the pain this long why not longer, I think that after physical therapy they did something as it hurts like hell all the time now. I have some stiff pain med's but I sure as hell can't take those when I am under a car.

It it will come around, more MRI's next week sometime of my back to figure out what is going on.

ShowSS12

· #96 · May 23, 2011

Nice I have been putting this mod off for a while now. I need to start collecting some parts. Now what are the plans for the rear parking brake?

94MI9C1

Discussion Starter · #97 · May 23, 2011

If I tell you I would have to kill you

Honestly, I have backing plates from about three or four different vehicles. I have a way and it is drawn up to make a 02 or something up S-10 blazer with rear disc, backing plates work, but I am running out of time to wait on my CNC guy to cut the parts, so I went down another road and I will fully document this. Tobin's rear parking brake kit is awesome, but I was trying to see if there was another way, i.e. cheaper. .

I have it all mocked up on my donor rear end I just have to finish up some welding and trimming and make sure it all works. FYI it will be using B-Body backing plates (modified of course) and Tobin's rear bracket kit. You can't really beat the price for it, 105 bucks and it is super beefy and ready to go and you don't have to dick around with it.

The problem with the parking brake assembly and trying to mock it up and make it work right is the fact that you have to be able to push the axle in enough to remove or install the C-Clip for the rear. Short of doing some custom C-Clip elim kit, I think that I figured out how to make it work right, using factory B-body parts and Tobins rear bracket kit as mentioned above. Also note I am relocating the calipers to the front position instead of the rear on the rotor.

I have been working on this as much as I can, been some long and painful nights, as my shoulder is holding me up, I had to notch/narrow the rear frame for the wheels and tires that I am going with, I just have to do some finish welding for that. Trying to get my car in a rolling state so that I can get it out of the garage as I have a T56 conversion coming in shortly and it will take up most of the shop.

I will update shortly with pictures, that is if it works, if not back to the drawing board.

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ls1caprice

· #98 · May 23, 2011

Man I tip my hat to you for all that fabricating work, hopefully it works out as planned and we can get a full documentation of whats needed so we can follow in your footsteps, hell I'm even I'll be willing to pay for the knowledge just so you know that time, patience and diligence is appreciated.

94MI9C1

Discussion Starter · #99 · May 23, 2011

I appreciate it man, I think that there is more time finding the time to make it all work

I ran across ALOT of people trying to figure out the rear parking brake issue with little to no success, some made it work others didn't. I came across using the S-10 backing plate idea from a GN forum, figured I would try it, it would work I have confidence in that, and the backing plate has the caliper mount and everything on it, you would have to put on an adapter bracket, but fairly simple.
Them I started thinking about it, got a hold of Tobin and chatted with him for a bit on the subject and asked about just getting the caliper brackets for the rear, he told me he sold them separately anyway, so it was no sweat.

I honestly think that I have more time in the narrowing/notching of my frame than the brake stuff.

I should be updating this shortly, stay tuned

94MI9C1

Discussion Starter · #100 · May 25, 2011

5

Alright fellas here are some pics, I will post some more tomorrow when I get the chance, these are off my cell phone, they should be pretty good, but maybe not

Here is the deal with the parking brake solution that I came up with. I figured out a way to make an 02 and up S-10 4WD backing plate assembly work, but I couldn't get the parts machined fast enough, so I dropped that idea for the time being.

So I decided to look at the original backing plates and see what I could come up with on them. So I ordered Kore3's rear caliper brackets for 105 bucks and it includes all the hardware, not a bad deal at all.

I modified the original backing plates, by grinding down the original caliper mounting points, flush with the face of where the plate meets the axle flange, on the drivers side you have to cut off the original parking brake cable support and make one, I am in the process of this right now, the passenger side I just had to grind down the bracket for the cable a little.

Oh forgot to mention with this I am repositioning the rear brakes to the front of the rotors as they are on a vette.

Here is a somewhat modified backing plate, I will take some better pictures later, but here is a precursor. here is the drivers side, the marks in sharpie are the points tha thave to be ground down for reliefs for the new caliper ears to fit into.

Here it is of the the caliper and rotor mounted on my tester rearend that I have

I made a spacer plate that is two pieces, you have to have it this way so that you can get the C-Clips installed on the axles, I didn't take any pictures of these but I will. The spacing is about 1/4 of an inch on either side, I think that I will have to shave a little off of it, but you get the idea, will post more later,

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