So i'm getting ready to begin putting together a set of wide track axles out of an 86 CJ to put under my 80. been thinking about how nice it would be to have discs rear... Is it possible to use a front set of calipers and rotors from same year CJ on the rear? I know I would have to get a different prop valve and I also have a Booster and MC from YJ to swap in also. Basically torch out some brackets to weld in place on axle to mount caliper to. Make sense?
much like the kits available for one tons using chevy 8 lug front caliper and rotors but sized down to use original front CJ parts with the 5x5.5 lug
Don't really know if you can use the same disk rotors/pads on the rear as you have on the front (the calipers would need to be different for sure in order to connect E-brake cables). Good question. As for the YJ parts you have, the YJ MC may not be a good choice as I believe the YJ still had drums in the rear.
I also have a D44 out of an 86, so I'm interested to see what info comes available.
opCorn:
Front calipers have no provision for an e-brake. To stay legal you'd have to use calipers with a built in mechanical e-brake mechanism. Something like the maxima or eldorado calipers. But with those you cant use the large CJ vented rotors and instead have to go with a thinner solid rotor (suzuki etc.) And as mentioned, you need a MC from a disc-disc vehicle, YJ ain't gonna cut it. Do a search (either on here or google), there are plenty of threads and writeups about disc conversions.
Not too worried about the ebrake as I haven't had one in over ten years anyhow. Was just going to throw a line lock on for occasional use. So id need to change the MC. But other than that it is feasible? I just didnt know if front rotors would have a problem mounting on the rear shaft flange.
the only problem with line locks, they are rendered useless if you loose the hydraulics. Once hydraulics are lost how do you stop the vehicle? Maybe it's just me but I like the idea I have some sort of way to stop in case of hydraulic failure.
The front rotors should physically fit the rear flange. You can always space the caliper brackets/calipers to line up correctly with the rotors.
I bought some weld on brackets on Ebay and used 3/4 ton Chevy truck calipers with the latest model (2010 I think) Dakota rotors and a disc/disc MC. Works great
I used 87 300ZX calipers with Geo tracker rotors. There are threads on this all over the interwebz. You do have to remove the 10# residual check valve for the rear brakes or they will drag with these calipers. The caliper piston is small on this set so you don't need a different proportioning valve.
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