8 3/4 Rear Disc Brakes

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Brambles

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Jan 11, 2007
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British Columbia, Canada
My Dart already has the front BBP discs and the rear is a drum BBP 7 1/4 ( didn't think they existed?) I'm pieceing together a A-body 8 3/4, probably use yukon axles with BBP and want to upgrade the rear brakes. Discs will look better then drums IMO.

I've done a little reading and some guys have mentioned the Grand cherokee rear disc brakes, is this a direct bolt over or is there some foolin around to do? Does the E-brake hook up and work?

Are there other options for street cars?


I also have been sourcing bigger drums just incase I can't get a disc system together. I heard reference to some drums making it so you can't use some types of wheels, anyone got some info on this issue?

Thanks

Brambles
 
I have never heard of the Cherokee brakes swap. But it would be nice if it they were to bolt right up. There are a couple companies that make adapters for a rear disk setup. Have tried looking into that? Its a cheaper route than buying the kits.
 
I was thinking using Ford Exploder discs. I have an 8.8 that I could steal from. Just a thought.
 
well its easy enough to figure out that the 8 3/4 has one more mounthing stud at the bottom of the housing for the backing plates, thats the only difference between the two! if a guy couldnt figure that out then they shouldnt really be working on a brake system anyway. sorry Brambles just trying to help, but some people are here just to correct and criticize! dont they have anything better to do?
 
speedyb-cc said:
I think we are confusing an 8 1/4 with his 8 3/4
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I don't think he was criticizing. He was just pointing out that there was an error.

When I first saw that Wilwood came out with their disc kit for the 8 3/4, I wrote them and asked if it would just bolt onto an 8 1/4 without the centre bolt. They said no, it wasn't that easy and wouldn't bolt on. I never did try it even though I bought a kit for an 8 3/4 and I have a spare 8 1/4.

Dam I should get my *** out there and try it for you guys.
 
No criticism intended. If we all knew everything about our cars we wouldn't need this forum to ask questions. I for one didn't know about the minimal differences between 8 3/4 and 8 1/4, but that doesn't warrant calling us stupid. The fun of learning shouldn't be overshadowed by being afraid to tackle a new project.
Bruce
 
v8 i think your response was unwarented and uncalled for. No one was criticizing you, just making a clarifacation. Just because you can do something to a 8 1/4 doesnt mean it will always work with a 8 3/4.
 
Here is my 8 3/4 with disk brakes.

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where did you get that disc brake setup? very interesting :-D i was thinking of looking into this for a future project too, just need a rearend first :read2:
 
OK, speedyb-cc sorry for getting out of hand maybe its just me but it does seem like there are a couple people on this form that act this way, i guess i just got a chance to call out on it and got carried away. i didnt call anyone stupid or want anyone to think so, Apologies to all i offended in anyway! ...........Apologies accepted?
 
V8-valiant said:
OK, speedyb-cc sorry for getting out of hand maybe its just me but it does seem like there are a couple people on this form that act this way, i guess i just got a chance to call out on it and got carried away. i didnt call anyone stupid or want anyone to think so, Apologies to all i offended in anyway! ...........Apologies accepted?
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Good man, Takes a bigger man to jump in and make a apologie when something goes wrong. Bravo! Now doesnt that put a smile on your face?:-D
 
Doctor Diff offers the best rear disc brake setup for the 8 3/4 rear end. Baer has a pretty good kit also. There are a bunch of other kits out there that I wouldn't use if they were given to me.
 
AndyF said:
Doctor Diff offers the best rear disc brake setup for the 8 3/4 rear end. Baer has a pretty good kit also. There are a bunch of other kits out there that I wouldn't use if they were given to me.
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Doesn't the Baer kit use a Corvette ('88?) rear brake rotor, and like a '90 Camaro caliper?
 
I like Dr Diff's brake setup! Mustang brakes would be plentifull and easy to get parts for. As would the Scarebird one.
 
The biggest problem with a lot of the rear brake kits is that they use too large of a piston. With a big rear piston you have to run a huge front piston and then a big master cylinder. If you use a big rear piston with a small front piston you'll end up with a rear bias that you can't fix. The car will spin if you lock the brakes.
 
AndyF said:
The biggest problem with a lot of the rear brake kits is that they use too large of a piston. With a big rear piston you have to run a huge front piston and then a big master cylinder. If you use a big rear piston with a small front piston you'll end up with a rear bias that you can't fix. The car will spin if you lock the brakes.
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Which kits would you be reffering to? It makes sence to me,what you said about big rear brakes and small fronts. Im using stock Kelsey hayes 4 piston sbp brakes up front. Possible use Mustang rotors there to get the bbp but thats the only mod.Im thinking the mustang brakes should be fine for this setup.
 
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