CPP 12 bolt disc conversion issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jmh68C10 · 12-04-2017, 01:16 AM

Hi everyone, I am using the disc brake conversion for the 12 bolt rear on my truck. I am having trouble getting the outer pad to clear the rotors. Is there something simple I am missing? I called CPP and they said this rarely happens but they have seen it and are sending me multiple smaller shims to replace the single shim that was meant for the swap. The axles are bottomed out on the "center pin" but is it possible I got something out of sync causing the axles to sit out? I dont see how that could be but then again I dont have much experience with rears. I need under a 1/8th of a inch more clearance for them to slide over. I figured it would be worth a post while I wait for the smaller shims

Andy4639 · 12-05-2017, 05:02 PM

When I did mine I had several issues with their brakes. This was one of them. Air in the caliper to small of fittings for the truck brake lines no customer support at all except it was something I did wrong. Not..

Good luck with it and hope you get the e brake working good. Mine still isn't perfect but it does hold the truck on level ground.

12-04-2017, 01:16 AM	#1
Jmh68C10 Registered User Join Date: Nov 2016 Location: Richmond Va Posts: 68	CPP 12 bolt disc conversion issues Hi everyone, I am using the disc brake conversion for the 12 bolt rear on my truck. I am having trouble getting the outer pad to clear the rotors. Is there something simple I am missing? I called CPP and they said this rarely happens but they have seen it and are sending me multiple smaller shims to replace the single shim that was meant for the swap. The axles are bottomed out on the "center pin" but is it possible I got something out of sync causing the axles to sit out? I dont see how that could be but then again I dont have much experience with rears. I need under a 1/8th of a inch more clearance for them to slide over. I figured it would be worth a post while I wait for the smaller shims Attached Images __________________ 68 c10- Under construction

12-05-2017, 05:02 PM	#2
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: CPP 12 bolt disc conversion issues When I did mine I had several issues with their brakes. This was one of them. Air in the caliper to small of fittings for the truck brake lines no customer support at all except it was something I did wrong. Not.. Good luck with it and hope you get the e brake working good. Mine still isn't perfect but it does hold the truck on level ground. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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