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Old December 19th, 2007, 01:28 PM   #1
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Default pick n pull amc20 disk brakes...

I am currently compiling a folder of 'research' on info for future mods etc on my 86 cj7. I will probably in the future go with the 1 piece axles and some bracing/welding axle tubes into pumpkin so they won't spin. aside from people saying i am polishing a turd :chiefwoohaw::chiefwoohaw:, i am trying to find out if there is an option for disk brakes in the rear.

i have found one article on a nissan 300zx rear caliper/96 tracker 2dr front rotor on PGH-offroad.com.

my question is, why wouldn't any caliper/rotor assy from the same bolt pattern work? i ahve an extra D30 that would have the same rotor lug pattern, i don't understand brake conversions enough to know why merely making a bracket for the 30 calipers woulddn't work on an AMC 20 axle.

Thanks, that is all class
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Old December 19th, 2007, 01:31 PM   #2
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I don't see why you couldn't use the 30 brakes on the 20 with some sort of brackets. As long as the wheelstuds will work. (length and threaded) I'm not real familiar with amc stuff though.
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Old December 19th, 2007, 01:36 PM   #3
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fyi, here is a link to the other writeup for the search.

AMC 20 disk conversion, brakes
http://cjoffroad.com/forums/topic.as...81&whichpage=1

also have searched car-part.com for the rotors/calipers, and i'd be almost 200 bucks into it by the time i just got the yard parts minus pads and misc stuff. puttin 300+ into disks on the amd20 MAY be polishing a turd
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Old December 19th, 2007, 01:49 PM   #4
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I imagine you could get a complete 30 for less than $200. You would still need to get/make mounting brackets, and buy a proportioning valve.

Polishing a turd or not....Stopping power is a good thing.
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Old December 19th, 2007, 01:59 PM   #5
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the reason people are using the 300zx calipers and geo rotors is to get parking brakes on the rear for cheaper than trying to run cadillac calipers (which are similar to chevy truck calipers, but with a built-in parking brake).

if you don't care about a mechanical parking brake in the rear, then you can't get much cheaper than ford rotors and either chevy s-10 or 1/2-ton calipers and some quick brackets.

pirate4x4 has a big thread on the import calipers with mechanical parking brakes:

http://www.pirate4x4.com/forum/showthread.php?t=174851
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Old December 19th, 2007, 02:43 PM   #6
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JohnnyJ is right. I run 80's seville calipers on my rear 44. they stop great but are expensive. like $110 plus core and over $300 new. they can also be a hassle to set up. although they stop the 35's nicely and the parking brake holds the sbc when in gear.
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Old December 19th, 2007, 03:04 PM   #7
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cool, great info fellas!!! will cotinue researching. reason i was wondering about the D30 is becasue i already have a complete one in my posession out of a CJ. Figured i could keep the other parts as spares (shafts, spiders, housing if need be) versus selling it for 75 bucks or something.

am looking more into what type of MC and P-valve would be best, as well as the pirate threads. this type of research is WAY better than doing crap for school.
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Old December 20th, 2007, 07:26 PM   #8
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FWIW if anyone else searches in the future... came across another pirate thread. looks like the rotors need machining in order to work. from what OTHER people on the board say (none could actually verify from experience), the D30 calipers should work, but again, lack an e-brake. I am going to keep my options open though and keep researching
http://www.pirate4x4.com/forum/showt...57133&t=294316
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Old December 21st, 2007, 10:41 AM   #9
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Quote:
Originally Posted by JohnnyJ View Post
the reason people are using the 300zx calipers and geo rotors is to get parking brakes on the rear for cheaper than trying to run cadillac calipers (which are similar to chevy truck calipers, but with a built-in parking brake).

if you don't care about a mechanical parking brake in the rear, then you can't get much cheaper than ford rotors and either chevy s-10 or 1/2-ton calipers and some quick brackets.

pirate4x4 has a big thread on the import calipers with mechanical parking brakes:

http://www.pirate4x4.com/forum/showthread.php?t=174851
Chevy trucks have the "inner shoe" mechanical parking brakes on their rear disc setups now. I have an AAM 1050 disc brake setup on my XJ's D70 rear. Not cheap, but very nice.
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Old December 21st, 2007, 06:03 PM   #10
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Quote:
Originally Posted by JohnnyJ View Post
if you don't care about a mechanical parking brake in the rear, then you can't get much cheaper than ford rotors and either chevy s-10 or 1/2-ton calipers and some quick brackets.
This is how we do it. Most of the "e-brake" calipers are a pita. If you need a parking brake either run a disc/drum setup like most new trucks, or run a driveline brake.

Adam, if your d30 rotors fit over your axle flange, and they are deep enough, there should be no reason you can't weld a bracket on the axle for a caliper.
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Old December 21st, 2007, 06:58 PM   #11
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thats what i was thinking. was gunna make a template to have JCR or someone plasma or CNC cut.

after i get my new 30 swapped in, im going to see if the hat fits over properly, or if it needs machinig. lots of the problems people have had w/ D30 rotors were w/ 1 piece axles on the 20 which i hope to go to eventually, so we will see
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