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**damnyankee36** · 07-04-2023, 03:32 PM

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?

07-04-2023, 03:32 PM	#1
damnyankee36 Senior Member Join Date: Sep 2002 Location: Alamogordo, NM Posts: 683	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? Attached Images