I recently picked up a nicely biult 8.5 rear that has strange a1032 c-clip elininators already installed. i am trying to decide my options for brakes. the g body brake flange now has a 4 bolt pattern for the eliminators but the long ear has been cut off. can i use standard g body backing plate and just drill the two new holes or will the backing plate flex too much without the long ear ? i could go with the right stuff disc kit but not sure if the kit for the earleir 4 bolt gm pattern will be spaced correctly or if the supplied lines and parts will work correctly on a gbody.
8.5 WITH C-CLIP ELIMINATORS. BRAKE QUESTIONS
- Thread starter 81msw79
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Don't assume what the 4 bolt pattern is. There are several different ones. Measure it up and go from there. I would guess that most anyone doing what you've described would use a Ford 9" big bearing pattern, but again...don't *ss U ME. I think you'll find your options are close to limitless if you're going to run a 17"+ wheel.
have zero intentions of ever putting anything other then gm 15 inch rally wheels on the car so that narrows that down alot. i already did some measuring of an 8.5 that is on a stand to this one. bottm mounting holes are same distance apart. it looks like a trimmed downed factory flange with the clip kit that i included a part number for. so as i asked. would a stock g body backing plate work fine without the long ear that the pin on top bolts throug h work fine without that ear or will it weaken the usability of the backing plate
DO you have a picture of it? I have never seen a 10 bolt c-clip eliminator. Is it year specific to the g-body? If not and the eliminator has the standard 4 bolt pattern, I would look at using an early Chevelle backing plate that used the 4 bolt pattern.
The wheel cylinder mounts on the flange. Prior to the G-body brake design, the typical GM rear brake pattern is a trapezoid - two holes line up either the existing small backing plate retainer bolt holes, just need to drill to size. The upper pair just fits if the PO cut the flange right. The unknown here is what do the elimimators do to either the drum or disc fitment. A picture would help with our armchair engineering.
https://gbodyforum.com/threads/how-to-camaro-rear-disc-brake-swap-to-g-body-axle.55480/
https://gbodyforum.com/threads/how-to-camaro-rear-disc-brake-swap-to-g-body-axle.55480/
I have the drum brakes on the 8.2" 67 A body rear. It used the same drum and emergency brake cable and has a bolt in wheel cylinder. The backing pate is bolted to the flange with 4 bolts
Here is a few pics. the flange was defenitly a cut down g body flange and drilled for the pattern of the old 12 bolt /8.5 10 bolts . the brake bracket on there now will be getting returned to the old owner .it was a wilwood kit that was on there.
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the wheel cylinder does not mount to the flange. there is a very large hole in the flange that the retaining clip fits through and seats directly on the backing plate itself. now if you run the s10 wheel cylender bracket that will need to be drilled the flange and bolted in. The pin for the springs however does bolt through above the wheel cylinder. i could do blazer rear brakes or ls1 but not sure what i need to make ebrake work. . blazer brakes i know will clear a 15" corvetter rallye with no issues. not sure about ls1. i also dont care if the e brake is mounted in the caliper of in the drum of the rotor. just need brakes that work .
Based on the picture, use the early Chevelle backing plate and wheel cylinders and you're done.
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