Right Stuff Rear Rotor Issue - Chevelle Tech
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post #1 of 20 (permalink) Old Aug 13th, 19, 2:39 PM Thread Starter
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Michael
 
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Right Stuff Rear Rotor Issue

Hi All,
Maybe someone can offer some advice. I am doing a 4 wheel disc conversion to my 1966 Chevelle SS. I purchased the Right Stuff kit AFXDC41C. The rear rotors measurements are:
Diameter: 11.13 in./282.70mm

Rotor thickness: 1.000 in

It appears that when the caliper id on the wheel, it is not deep enough, making it too far from the dust plate, they should be much closer. Looks I need a rotor that is deeper. At this point I can't even fit a brake pad in. I have attached a pic to better illustrate the problem, and visuals of how the rotor looks.

Any info would be great.
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post #2 of 20 (permalink) Old Aug 13th, 19, 3:19 PM
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kevin
 
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Re: Right Stuff Rear Rotor Issue

Been battling with my right stuff kit for nearly 2 years. Mine is on a '68 so probably a little different offset but have the same issue trying to center the pads/caliper. My latest idea is to get some of the mounting plate machined a bit deeper (where it is already machined) maybe .02 or so to try to get the proper offset. mine drag no matter what I have tried! Another option been thinking - is to get some plates from cpp to use except they are $90 a set.. best wishes!
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post #3 of 20 (permalink) Old Aug 13th, 19, 7:25 PM
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Bruce
 
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Re: Right Stuff Rear Rotor Issue

You're correct, there are a lot of smart, experienced car nuts on this site.

However, my first call would be to Right Stuff Detailing (RSD).

My second call would be to InLine Tube (ILT) because ILT supplies the parts to RSD (just remember: it's really easy to get banned by ILT).

I'd also do a search of this site for others who have posted your question.

Our You Tube Vids:
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post #4 of 20 (permalink) Old Aug 13th, 19, 8:20 PM
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Mr Bill
 
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Re: Right Stuff Rear Rotor Issue

What does RS say ? Maybe they put the wrong rotors in your kit. What axles do you have, stock ?

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post #5 of 20 (permalink) Old Aug 13th, 19, 11:02 PM
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Steve
 
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Re: Right Stuff Rear Rotor Issue

I had to open up the center holes a hair to get them to seat on the axles. The instructions do mention that. I can't tell from your pic, but are your rotors fully seated on the axles? The center pilot should protrude from the rotor.
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post #6 of 20 (permalink) Old Aug 14th, 19, 11:34 AM
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kevin
 
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Re: Right Stuff Rear Rotor Issue

FWIW - my calls to rs have not been helpful...
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post #7 of 20 (permalink) Old Aug 14th, 19, 11:54 AM
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Ben
 
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Re: Right Stuff Rear Rotor Issue

I looked up the instructions and it mentions A) opening up the rotor hole; B) shimming the caliper bracket off the axle housing to center rotor in pads. Have you tried shimming?

No car yet; currently looking for 66-69 project/driver.
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post #8 of 20 (permalink) Old Aug 14th, 19, 12:18 PM Thread Starter
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Michael
 
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Re: Right Stuff Rear Rotor Issue

I haven't taken any action opening up the rotor holes etc. I downloaded the instructions last night and it does say for an extra $30 or so they could have them machined before you receive them. As far as my axles, I believe they are the original, my car was in a barn for many years and they appear to be stock, and had stock drums on before being removed.

I did ask Right Stuff if I had the correct rotor and I sent pictures, which they confirmed is the correct rear rotor. I also asked if they had a deeper rotor or wider and they said the rotor was correct. My question is that if I unknowingly do have an aftermarket axle, do they not have a rotor that would be deeper / wider to fit?
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post #9 of 20 (permalink) Old Aug 14th, 19, 2:26 PM
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Steve
 
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Re: Right Stuff Rear Rotor Issue

I used a sanding drum in an air grinder. It took about two minutes per rotor. I just went around the pilot hole a little at a time and kept test fitting until the rotor sat flush on the axle. It didn't take much off at all, but they weren't going to seat without doing it. This was on stock ten bolt axles. The kit came with different thickness caliper shims, but I didn't use any because everything centered properly without them.
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post #10 of 20 (permalink) Old Aug 14th, 19, 2:43 PM
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Re: Right Stuff Rear Rotor Issue

Does the rotor get centered by the pilot hole? If so I would be careful to use a procedure that made sure the center pilot hole remained concentric, i.e. turned on a lathe. Don't know how much a vibration could result. If it gets centered by the wheel studs then nvm

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post #11 of 20 (permalink) Old Aug 14th, 19, 3:47 PM
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Beth
 
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Re: Right Stuff Rear Rotor Issue

Quote:
Originally Posted by modonnell80 View Post
I haven't taken any action opening up the rotor holes etc. I downloaded the instructions last night and it does say for an extra $30 or so they could have them machined before you receive them. As far as my axles, I believe they are the original, my car was in a barn for many years and they appear to be stock, and had stock drums on before being removed.

I did ask Right Stuff if I had the correct rotor and I sent pictures, which they confirmed is the correct rear rotor. I also asked if they had a deeper rotor or wider and they said the rotor was correct. My question is that if I unknowingly do have an aftermarket axle, do they not have a rotor that would be deeper / wider to fit?
To install rear discs from a 2000 Camaro on a 10 or 12 bolt axle, you have to install a 3/16" thick shim between the backing plate and axle housing.

That will move the caliper outward enough to center it on the rotor.

Read Al's writeup at Team Camaro:

https://www.camaros.net/forums/16-br...-pictures.html

How much do you need to remove from the OD of your axles to get the rotors on ?
If it's a few thousandths, just keep going around the OD of the axle with a sanding disc until the rotor goes completely on.

Easy peasy

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post #12 of 20 (permalink) Old Aug 14th, 19, 4:03 PM
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Ben
 
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Right Stuff Rear Rotor Issue

Nashville Beth; I know what youíre talking about with turning down the axle for the LS1 Camaro/ C5 swap, but I think the right stuff kit doesnít need that. If I understand it correctly, the very center hole of the rotor may be too small to fit over the protrusion in the center of the axle (see blue circle in pic). Whereas LS1/C5, itís actually a step inside the rotor hat (for drum in hat e brake) that needs to clear the axle.
If thatís the case, should be pretty easy for the op to determine if this is the problem as the rotor wonít slide over that protrusion, therefore wonít sit flat against the axle flange. If it is over it and sitting flat, Iíd bet itís a shining issue.

No car yet; currently looking for 66-69 project/driver.
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post #13 of 20 (permalink) Old Aug 14th, 19, 4:38 PM Thread Starter
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Michael
 
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Re: Right Stuff Rear Rotor Issue

Skreddy, I think you are right. After looking at some videos they posted online for rear brake rotor installs, it seems like part of their process is to machine the center hole slightly to open up the diameter to fit the axle. They charge $30 for that service and they say that's a rare case. From what I have read online, it seems to happen more often than they know.
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post #14 of 20 (permalink) Old Aug 14th, 19, 6:31 PM
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Dan
 
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Re: Right Stuff Rear Rotor Issue

I had to have mine opened up.
The machinist said it only took .002".
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post #15 of 20 (permalink) Old Aug 14th, 19, 6:44 PM
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John
 
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Re: Right Stuff Rear Rotor Issue

Quote:
Originally Posted by danbo View Post
I had to have mine opened up.
The machinist said it only took .002".
I had to have that inner hole enlarged also. I used a small sand drum & only needed cleaning up.
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