I understand some of you would not have done this.
I chose to do this to the fact of very limited support when I live.


So last year I ordered The Right Stuff 4 wheel disc brake kit AFXDC41C for my 1964 Cutlass 442.
It took over 6 months until all parts were finally in to send to me. By that time my car was back in storage for the winter.

Fast Forward to last week.
Got the car to my buddies shop to start this. Well, I’m waiting on steering parts and an axle.
I never changed anything and pretty sure nothing was changed up front since ‘64.

So I Started on the axle that is good (replaced years ago because bearing spun).
Everything is correctly spaced.
But the 15” SS1 wheels hit the caliper.
Anyone have this issue? What did you do?
I emailed the company and will probably call Monday to see what they say.


So far…. Not good…

 

It looks like it’s Juuuuuuuuust touching.
I wonder if an 1/8” wheel spacer would do the trick?
Is that what you were doing with those washers on the lugs?

 

that’s what I wanted to try by my lug nuts aren’t long enough.
I’m thinking 5/16 or 3/8 spacer. That’s what I’m reading on other Buick and Pontiac sites. Guys on OCA suggest the same.

 

I had the same problem with a front disc conversion. Just grind down the caliper a bit. Worked for me.

 

I got an answer from Ed at The Right Stuff.
“only advise we have to offer would be to look at wheel spacers to push the wheel outboard. not sure how hard it is hitting, but most spacers start at 1/2" and i would start there first”

Not the best answer. I recognize not every car is the same and the kit spans ‘64-‘72. But to say they have no other advise is not what I expected.

I am currently going through a Raybestos book and can find at least 3 rotors within spec with a little taller hat that would allow me to move the bracket back and still center the rotors to the pads.
I will probably use spacers for now but will try other rotors in the future.

 

Most spacers start at 1/8th
i don’t think I’d ever use 1/2

 

Yeah, makes wonder his much they actually care.
i have a 5/16 I’m going to try this week.

 

Cant tell where the interference is. But there are two different profiles for wheels. Perhaps you wheels were for drum brake cars. The wheel profile on the left is for disks, the one on the right are for drums only. (thanks to Joe P for this photo)

 

When I did a rear disc swap I had to use a 1/8" spacer to clear the caliper. It was barely touching and the 1/8" gave all the clearance I needed.

 

IIRC those are 14" rims. I would think the same would apply for 15" rims but I think there are no clearance issues w 15" rims and factory brakes.

The right stuff rear disk conversion frequently comes up w issues.

 

I had a similar problem when I put rear discs on my 77 GMC Sprint, The wheels barely hit so I ground a little off of the caliper and all is well. I have 8" wide 15 inch ralley wheels.

 

I can’t help you with the brakes but that is a beautiful car!