sbp rotor shims
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Thread: sbp rotor shims

  1. #1
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    sbp rotor shims - disc caliper alignment

    Hey gang,

    I'm putting together rear disc brakes on my '65 Barracuda that has an 8-3/4" rear end with a small bolt pattern for wheels.

    The rotors sit right up against the inboard side of the caliper and it looks like only way to push them outward is to use a wheel shim or spacer. When I look at Summit or Rock Auto there are many rotor shims, but nobody lists them by dimensions.

    I doubt anyone makes one for an early A-body. Does anyone know anything about this?

    Cheers.
    Last edited by r3dplanet; 07-03-2019 at 07:24 PM.

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  3. #2
    BBD LEGEND qkcuda's Avatar
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    5 by 4 inch bolt pattern spacers will be tough to find now. Try searching for 5 by 100 mm. it is virtually the same. At worst you may have to open the bolt holes a tad.

  4. #3
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    Agreed. I reached out to a couple of places who make custom spacers who also agreed that 5x100mm is the easiest approach, but I need only 0.100" thickness. Apparently the minimum thickness they sell is 3/16". Looks like I'll have to find a way to fabricate my own.

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  6. #4
    BBD LEGEND qkcuda's Avatar
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    Can you space the caliper back instead?

  7. #5
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    That would certainly be the better way to go. I can see how to shim the caliper on the bracket to move the caliper outboard, but that only makes the problem worse. It doesn't seem possible to shim the caliper inboard.

    I'll get some photos.

  8. #6
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    pix of enlightenment

    Okay, here are some photos that show the problem probably better than I can explain it. In the first photo you can see how the rotor rubs right against the right side of the caliper.

    rotor_rub_caliper.jpg


    This photo shows how the caliper mounts to the bracket (Scarebird). You could add some spacers between the caliper and bracket, but it would only make the problem worse. The caliper needs to move the other way.

    caliper1.jpg


    Here's a view from the rear without the rotor installed.

    caliper_rear.jpg

  9. #7
    BBD LEGEND qkcuda's Avatar
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    Yes the bracket is on the wrong side of the adapter to be able to space it back. You could use washers on the wheel studs to temporarily align the caliper. It looks like you will need more than .100 of a spacer to center it.

  10. #8
    Full Member my64dart's Avatar
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    Hi,
    I installed The Right Stuff disc brake conversion on my 8 3/4 Mopar rear end and didn't have this problem. But I did have to buy some 1/4" spacers because my wheel rims were slightly rubbing on the caliper's when the wheels turned. I think the guy on Ebay has a machine shop and makes them up. Maybe you can contact him and see if he can help.
    383 stroked to 432c.i. / 440Source Stroker / Edelbrock RPM heads / 750 Holley / Torker Intake / Lunati VooDoo cam / Dynamic 9.5 converter / Cope Racing Trans / 3:55's with a suregrip /I'm Always Working On Something

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