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Old 07-04-2023, 03:32 PM   #1
damnyankee36
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Another Mystery Part

This is kinda embarrassing; I've been working on cars and trucks for 50 years but I have never come across this.

I bought a CPP disc brake conversion kit and this came in the caliper box, one with each caliper:

It's a square O-ring, about 1 1/2" OD. I have no idea what this would have to do with a caliper install. 67-72 C10

Any ideas?
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Old 07-09-2023, 10:42 PM   #2
MySons68C20
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Re: Another Mystery Part

Packing material?
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Old 07-10-2023, 10:58 AM   #3
damnyankee36
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Re: Another Mystery Part

I suppose that's a possibility although the way they were just laying in the box they weren't doing much!
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Old 07-10-2023, 03:35 PM   #4
MySons68C20
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Re: Another Mystery Part

Did the calipers come with the pads already installed?
The oring way have been there or provided to keep the pads in place during install.
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Old 07-10-2023, 05:24 PM   #5
damnyankee36
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Re: Another Mystery Part

Calipers were loaded but the bolts were also installed which kept them in place.
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Old 07-10-2023, 05:46 PM   #6
MySons68C20
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Re: Another Mystery Part

I give up!
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Old 07-10-2023, 06:50 PM   #7
damnyankee36
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Re: Another Mystery Part

Me too! I'll save them for alternate uses!
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Old 07-13-2023, 06:35 AM   #8
RustyPile
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Re: Another Mystery Part

The two mounting bolts pass through two sleeves in the "ears" of the caliper.. Inside each of those holes in the "ears" is a groove.. Those O-rings fit in that groove, and the sleeve passes through it.

The brake section of my '71 Service Manual shows a blow up picture of the caliper.. Those O-rings are shown in that picture...
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Old 07-13-2023, 07:27 AM   #9
damnyankee36
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Re: Another Mystery Part

These O-rings are about 4x the the size of the mounting bolt O-rings.
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Old 07-20-2023, 08:36 AM   #10
68 P.O.S.
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Re: Another Mystery Part

Quote:
Originally Posted by damnyankee36 View Post
These O-rings are about 4x the the size of the mounting bolt O-rings.
Indeed
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72 C10 lwb fleetside -stock 350/350 combo
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Old 07-28-2023, 03:54 PM   #11
68Gold/white
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Re: Another Mystery Part

Nothing but packing..........
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