rotor not lining up

[cheapthrillz]

Try a cheap feeler gauge between the PAB and rotor. That's what I did and it works pretty well.

[Ishmael]

So if Pontiac hubs are wider and I have determined my spindles are normal than why are my rotors running inboard? Additionally what's the difference between a shim and a spacer? Does anyone make spacers that will fit inside the hub?

[JRouche]

Additionally what's the difference between a shim and a spacer? Does anyone make spacers that will fit inside the hub?

Just to clarify. I didnt mean to shim the rotor or hub. I meant shimming the caliper to spindle. Thats a common practice.

Shims or spacers?? Its all the same. Basically its a thin piece of metal that is either ground for parallelism or a thin sheet of metal (can be soft metal or spring hard) that is measured for a correct thickness. Its a uniformed piece of metal that can be anywhere from .001" thickness up to what ever the supplier provides. If you need a thicker shim then a machined (ground) spacer covers that area. JR

[Ishmael]

What I need is a wheel spacer that will fit inside under the rotor hat. I know it isn't the best action but I can't figure out why the rotor won't line up since the spindle is the same as a camaro spindle at the boss and the hub is the same as a camaro hub according to what came from touring-classics. Is it possble that the spindle had been machined bringing the flange ( or whatever its called) where the hub is supposed to stop, back a little ways or that the bearings have been pressed in too far on both hubs? Does somebody have some spindles that could measure that distance for me? Or does someone know where I can find a spacer that is 5.9 inches in diameter and 3mm thick? Short of having some made, I can't find them anywhere.

[a67]

See the eBay link in this thread:

https://www.pro-touring.com/forum/sh...ad.php?t=68230

Appears that kit comes with shims for between the hub & rotor. Maybe contact the ebay seller for the thickness and if they may be purchased separately.

Bob.

[Ishmael]

thanks for the link,
Tobin I hope you are reading this cause I got some new numbers.
First, I've got spindles that look like camaro spindles but have the smaller boss bolts.
2. I can't get the seal on the back of the hub to within a 1/4" inch of the back of the spindle so maybe I have the wrong bearings in the wrong hubs - see number 3
3. Pontiac hubs are 2 5/8" and the Chevy hubs are 2 3/8" if you measure them like touring classics from the bottom of the hub to the face. My hubs are 6 cm which is 2.36 inches or 2 3/8" I imagine. If I chev hubs on a somehow pontiac spindle and the wrong bearings could it locate the hub in the wrong place? If I was able to move it over the problem would be worse.
4. The rotor is 18mm or 0.708 inches thick - not sure the conversion on that. The hat is 6mm or 0.236 inches thick. I ordered c4 rotors from my parts place. Is this the right thickness.
As the pirate with the ship's wheel sticking out of his pants said, "arrrg, this is is drivin' me nuts!"

[a67]

It sounds like the difference between the Chevy and Pontiac hub is 1/4".

At the same time it would move the rotor out further for too much of a misalignment in the other direction.

It sounds like these are the standard duty C4 rotors (12" x .80"). Note that the rear C4 rotors have slightly less offset. Using those instead of a front rotor will move the disc portion toward the outside of the car by about 1/8".

Don't know if you currently have front or rear rotors.

Since this was a kit, have you contacted the vendor?

Bob.

[Ishmael]

It wasn't a kit. I got the adapter from Touring classics. Then I got the rest of the parts from my local parts place. I've got front rotors. if the rears are the same size I might be able to make them work. What diameter are c4 rear rotors? Should I be worried that the hubs aren't closer to the spindle which would actually make the problem worse?

[Ishmael]

Sounds like trying on the rears is a better option than using a spacer. I'd still like to figure out why it isn't working properly as is.

[LSx_88_Ciera]

Sounds like trying on the rears is a better option than using a spacer. I'd still like to figure out why it isn't working properly as is.

Aren't the fronts 13" if so the caliper won't line up right if you use a rear, the pad will hang over the edge of the rotor.

[Ishmael]

Aren't the fronts 13" if so the caliper won't line up right if you use a rear, the pad will hang over the edge of the rotor.

Ya, I'm getting tired and stupid.
I just reread Tobin's post about the chev drum hub. Mine are 2.36 if I measured right. 0.09" is 2.28mm which is close to the 3mm I'm out. I'll have to remeasure tomorrow but I'm pretty sure that's the right measurement. Where would those hubs have come from and why would they be on my car?

[gort69]

The C4 13" rotors are 1.10" thick.

[LSx_88_Ciera]

What happened to the pics you had posted?

[Ishmael]

I took them down because I wanted to put up more and had exceeded my limit. By the time I was ready to post up the new ones, someone had answered the question that was related to the new ones so it no longer made sense to post. What pic do you need? I'll even take new pics to try to get this mystery solved.

[LSx_88_Ciera]

One showing where the pads would contact the rotor face and how much clearance there is between the rotor diameter and the caliper.
I know this may sound stupid but I am wondering if you have an caliper bracket for a 12" rotor and a caliper for a 13" given the diff in thickness between the 12 and 13" rotors and the high amount of clearance you have.
I am reaching I know.

[a67]

One showing where the pads would contact the rotor face and how much clearance there is between the rotor diameter and the caliper.
I know this may sound stupid but I am wondering if you have an caliper bracket for a 12" rotor and a caliper for a 13" given the diff in thickness between the 12 and 13" rotors and the high amount of clearance you have.
I am reaching I know.

He is using C5 calipers which is why the centering is so critical. They are for a 32mm thick rotor.

C4 HD are 28mm thick.,

C4 standard are 20.5mm thick. Which is what he has.

What Ishmael needs to do is to find out more about the brackets he has. IOW, what are the proper parts to go with them.

He may actually be better off starting over. Figuring out which rotor and caliper will fit inside of the wheels. Then getting a new bracket (in steel !), for that purpose.

Bob.

[Ishmael]

One showing where the pads would contact the rotor face and how much clearance there is between the rotor diameter and the caliper.
I know this may sound stupid but I am wondering if you have an caliper bracket for a 12" rotor and a caliper for a 13" given the diff in thickness between the 12 and 13" rotors and the high amount of clearance you have.
I am reaching I know.

You're not reaching. I just got home, and after placing the mother's day tree in the yard where my wife will see it, I measured the rotor - 12 inches. The kit calls for a 13 rotor. I told the guys at the store to send me rotors for a 95, and I said C4. I should have been very clear. I don't remember Noel offering a kit for a 12' and 13" - only 13". There barely looks to be room for a 13" rotor to spin in therebut I didn't think there was a lot of area of pad/rotor overlap.

Well, some days and three pages later we figure it out and I probably wouldn't have done so without you guys. My wife and neighbour have been asking me how I was ever going to figure this out. It was even suggested that I send it to a mechanic. I told them you guys would help. (crying a little). Thanks guys.

[gort69]

Glad you got it figured out.

Don't forget that the 13" C4 rotors are directional. Order a R and an L.

Good luck!