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NCHornet 12-04-2007 10:56 AM

CJ disc brake conversion ?
As many of you know my son and I are doing a frame off on a 77 CJ5 which will be his first ride. I am worried about the saftey of the 4 wheel drum brakes, although my buddy who owned the Jeep before siad it stopped great. Funds are getting tight, should I worry about the drum brakes?
If I am going to put a new axle in now is the time to do it, since I have it all apart, is there a bolt on kit for the Dana 30 vs swapping out the axles? Old axles aren't to many in our small town. I appreciate all the help.

JeepHammer 12-04-2007 03:48 PM

Check your post on the JU board.

UPJ Wheeler 12-04-2007 10:37 PM

This might be of some assistance

St.Patrick 12-04-2007 10:49 PM

I have a 304 with 31's and the drums have no problem stoping it. But any one who has driven with disks can tell you that disk are better. Easier to work on and adjust, no fade or pulling. there should be a bolt on kit but that woould run close to $1000. If you follow something like the link UPJ Wheeler posted it will be a lot cheaper. here is the link to quadratec disk break conversion kits.
I think he would be fine for now but maybe something for the near future.

NCHornet 12-05-2007 04:42 AM

thanks, I appreciate the info. UPJ, The link you gave is for rear brake conversion and I need to fronts, but thanks for the thought!!

BIG REED 12-05-2007 06:53 AM

for most of my on road driving the 4 wheel drums worked good enuf to stop my 33" tires fine.

the majority of the problems i had were right after i had the drums under water while offroad, they were just plain unpredictable until they had a chance to dry.
they might lock up the tire(s) when i tap the brake, or they might do next to nothing when im standing on the brake pedal.

DuggerCJ 12-05-2007 11:35 AM

I just found a front axle from a (85') CJ7 with disks and switched them out with my drums (75" CJ5). D30 axle. It was a drop in replacement and fairly straight forward (although I am not completely finished yet). Ill post some pics when I get home.

NCHornet 12-06-2007 06:29 AM

If you could email me any pics and the steps you took that would be great. I haven't done anything like this before so pics are good. Did you have to change your spindles, some say yes and some say no?

DuggerCJ 12-06-2007 12:10 PM

Spindles were the same.

I sent you an email with some additional pics.

heres what it looked like when I removed the drum from the CJ5:

Heres what I removed from the CJ7:

heres what it looks like today:

jp360cj 12-06-2007 03:50 PM

NCHornet....I don't know where you are in NC, but I live just off of I-95 just south of the NC/VA and I've got all the brackets/spindles/calipers (for rebuild or core). I had just replaced master cylinder/drums/shoes about a month before i stripped the gears out and I got my hands on another axle that came with the disc stuff and I didn't want to buy have to turn around and buy new brake stuff again, so i kept my drums.

The knuckles for the drums and discs are the same. I doubt the calipers are any good, but they may could be rebuilt and if not, will work as a core. The discs are rusty, but idk if they could be turned or not. If you go this route you will need a different master cylinder and maybe front brake lines.

mcktiger 12-06-2007 05:08 PM

just find a 78 or later cj and swap from the knuckels out thats what i did to my 74 cj5 works great

jfwireless 12-06-2007 07:47 PM

I found a 77 with front disk brakes and just swapped out from the knuckles out for my 76 CJ7. Jeep did have different spindles and inside bearing diameters for drum and disk brakes, so you have to check what you have and see if you have the correct spindles and inner bearings. My 76 had drum brakes but the spindles and bearings for a 77 disk brake set up. Here is a link that gives you the bearing numbers for disk and drum brakes and should help you identify what you have and need.


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