Disc Brakes on an AMC20

[AussieCJ7]

Has anyone in AUS done this before ?

If so what donor parts did they use and how much work did it turn out to be ?

[OzJeeper]

Seen this done on a Dana 60 FSJ. If you may remember Gary Thompsons 2 door FSJ from Tuff Truck, he has done this and he is a local.
Ford disks (again - as in a TJ convert)
Not sure about a AMC 20. Will investigate and get back to ya. Gimme a day or two..... :rolleyes:

[AussieCJ7]

Thanks Oz Jeeper

I was looking at Go Jeeps write up and it got me thinking if it can be done to a amc20 and if anyone has already done it

[Wooders]

Eventually I want to convert the Front & rear of my CJ5 to discs - but give it's current state & list on the proirity queue - it will be a while ;)
Dave I'm sure it can be done on the AMC20 - but don't recall anyone doing it....

[Dorzun]

Dave,

I am considering it and in the middle of researching what can be done.

I'll let you know what I come up with.

[Jonesy]

Warn make a kit ..mind u probably big bucks :rolleyes:

[Gojeep]

The only thing that you would have to do extra is re-drill the stud pattern with the Ford 5 on 4.5" pcd ( same as XJ-TJ ) but the CJ's run 5 on 5.5" pcd. same as Ford F100 and Bronco.

I will look to see if one of their disks can be used as I have already checked the Jeep disks from the CJ's and they are too big in diameter.
When you use a different axle you will have to work out the distance from the front face of the housing flange ( what the old drum backing plate bolts too ) to the front face of the axle flange which holds the wheel studs. A Ford EA is 57 mm and XF is 52 mm and Dana 35c is 67 mm. Now you can see why I used a 10 mm spacer to keep the caliper central over the disk. If you use another rotor then you will have to take into account the rotor offset difference as well.

Let me know if I can help at all.

[AussieCJ7]

Thanks Go Jeep

The 5 on 5.5 stud pattern could be a problem to get around

Will F100 disks work with the EA calipers ?

[Gojeep]

It wont work with the EA caliper as the vented disks are too thick but the XF calipers which have the bolt on bracket on the rear as well are for vented and would fit over.
What I am trying to find out is the overall diameter compared to the XF disk and the offset. The problem so far has been that the XF is 286 mm verses the CJ's 298 mm. You would have to offset the bracket by drilling the mounting holes 6 mm ( half the difference ) toward the centre of the caliper to move the caliper over to clear the larger CJ disk. This could be done and would be still strong enough. I was just hoping that maybe a F100 or Bronco might be even closer in size to the XF disk but doubt it.

[Gojeep]

I just did some research and the front vented disks off a Vitara 4 door Estate LWB has the right stud pattern and is only 2 mm thicker than the EA disk even though it is vented and only 1 mm bigger in diameter. :D The DBA part number for these is DBA 514.
All I would need to know from you is the diameter of the centre hub that your drum slides over and the distance from the front face of the axle housing flange to the front face of the axle flange as desribed above. If you measure that for me I can work out what thickness the spacer would need to be if one is needed. The rest would be exactly the same as I show on my site as well as the parts you need to buy except you would use the Vitara rotors instead of the EA. tongue.gif

[AussieCJ7]

Go Jeep you are a ledgend :eek: :eek:

how do u work this all out

Now what do I have to measure exactly ?

Can it be done with the wheels still on ? or do I need to remove the drums ?

[dxj]

Repeat after me

"Marcus is a legend,
He never sleeps" :D :D

[Gojeep]

Gee thanks guys :D I'm really earning my 'stars' now.
I have alot of the specs on the different rotors and I used to work as a brake machnic for a short time.
You will have to remove your drums so you can measure from the axle flange on the side that the drum were against to where the drum backing plate bolts on. Then take off the thickness of that backing plate so I know the total distance to the flange on the axle housing that the backing plate bolted too.

[Gojeep]

Also dont forget to measure the diameter of the axle housing as this determines the centre hole size of the spacer. I am looking to find a diagram of your axle setup so i can see if nothing will interfere with the conversion. If you have one already post it my way. smile.gif

[paz]

another option is suzuki seirra,,daihatsu scat and of course the f100,,i will be doing this very soon on my jeeps,,,all will be soon 4 wheel disc..
paz

[AussieCJ7]

mmmhh could take me some time to get the measurments

Paz do u have a amc 20 there that you can measure ?

maybe TW can help out as if we get this working he can offer it as a product ?? I understand if u dont want to measure this Tony smile.gif

[paz]

nah sorry mate,,,i dont have one here,,but i might get a look at one of my mates in the next couple of days if it would help...
paz

[Gojeep]

Originally posted by paz:
another option is suzuki seirra,,daihatsu scat and of course the f100,,i will be doing this very soon on my jeeps,,,all will be soon 4 wheel disc..
paz<font size="2" face="Verdana, Helvetica, sans-serif">I had already checked all those but they dont offer the bolt on calpier bracket and were the wrong sized disks to use with the EA caliper and brackets.
It would only take less than 10 minutes to whip one wheel off and the drum and take the measurements! :rolleyes:

[paz]

aahhhhh,,,,i'm not really worried about bolt on..... :rolleyes: :rolleyes: :rolleyes: :rolleyes: :rolleyes: :eek:

[AussieCJ7]

I aggree Go Jeep it is slack of me.

here are the feable exusses

I live in a unit block so everything is a little harder to do

Wife just had a baby 6 weeks ago so 10min is next to impossible to find

If anyone else can help out please chime in not I will try to get the measurements as soon as I can

[Gojeep]

Dont worry about it and as a Father I know what you are up against and it doesn't worry me if it takes a while as it only for you I was trying to do it. tongue.gif

[Dorzun]

I'll get in under mine in the next few days and measure it up.

[Gojeep]

Originally posted by CJ Brad:
I'll get in under mine in the next few days and measure it up.<font size="2" face="Verdana, Helvetica, sans-serif">Brad, if you can I would really like some pictures so I can see how that bearing retainer bracket sits to see if we can bolt over the top of it or not! :)I would also need to know the thickness of it as it would needed to be included in centring the caliper bracket over the rotor.

[AussieCJ7]

here is a link that may give you some of the info u need

amc20 (http://www.off-road.com/jeep/tech/axle/amc20.html)

[Dorzun]

Will get some pics too. was going to do it last night then I heard that it was supposed to get down to -12 here in canberra so I decided to crack a bottle of red and sat in front of the heater and watch some Jeep vids instead.

[Gojeep]

Originally posted by AussieCJ7:
here is a link that may give you some of the info u need

amc20 (http://www.off-road.com/jeep/tech/axle/amc20.html)<font size="2" face="Verdana, Helvetica, sans-serif">Took a look at that but no info on bearing plate etc.

[Gojeep]

I just had Micheal come over with his CJ8 Overlander Laredo and I pulled off his drum so I could get the measurements I needed for you.
Taking into account the differences in how much the axle sticks out and the different offset of the Vitara disks ( DBA 514. ) it turned out that no spacer is needed at all. graemlins/spinrhead.gif Even the centre hole in the disk will slide right over and all. From what I can see the caliper bracket will replace the drum backing plate and spacer and bolt in it's place. The only thing I was not able to measure was the thickness of the caliper bracket but think it was 7 mm thick which would mean it would all work out to the mm. graemlins/beerchug.gif

So far so good and even the stock handbrake cables could possibly be used if you hook them up the same as DXJ did with his.

Just thought I would let you all know. graemlins/rock.gif

[OzJeeper]

There ya go - I always thought the CJ8 ran 44's front and rear....and the AMC 20 was a Cherokee axle only....learn sumfink every day... graemlins/headspin.gif

[Gojeep]

My CJ7 ran a AMC20 as well until I screwed the axle with that dumb key setup that they have. Put a shorted Ford 9" out of a F100 under it after that to handle the 351w V8. tongue.gif

[OzJeeper]

I remember a friend "doing" his back hubs - tapered spline and nut on a CJ7 Levis Edition.

Got out the oxy and heated the hubs. Placed 'em on the axle and gave them a thumping with a sledge to (as he said) "seat them well".

The retainer nut was applied with a quality socket and a 2 mtr long strongarm spanner.

Hubs never moved.... :eek:

This the AMC 20 setup we are refering to?????

[Gojeep]

Originally posted by OzJeeper:
I remember a friend "doing" his back hubs - tapered spline and nut on a CJ7 Levis Edition.

Got out the oxy and heated the hubs. Placed 'em on the axle and gave them a thumping with a sledge to (as he said) "seat them well".

The retainer nut was applied with a quality socket and a 2 mtr long strongarm spanner.

Hubs never moved.... :eek:

This the AMC 20 setup we are refering to?????<font size="2" face="Verdana, Helvetica, sans-serif">They are the very same ones :rolleyes:

[Gildo]

Had a chat with Steve morrison at the JOCV Christmas bash, he runs rear discs on his CJ7, and although he has rebuilt the whole rear end, he used Vitara rotors and Suburu calipers. From what he told me it was a major muck around to mount the calipers he fabbed brackets to get it all to fit right. The Vitara Rotors also needed to be drilled out for the 1/2 inch wheel studs.
Once the Visa card recovers from the Christmas Flogging, this is next on the list.
Thanks for all the advice so far Marcus, Ill keep you and the board up to date.

[Gojeep]

What I like about the EA calipers over Subaru's ones is that it made for a heavy car the same weight as the Jeep and then some as well as a drum replacement which saves master swapping. The brackets that bolt on are just so much better too.
Good point on the studs. I take it that the stock Vitra ones would be 12 mm ones like a lot of Japan ones. It would be easy to open them up the extra .7 of a mm.

[Gildo]

Thought Id revive this thread, any further progress from anyone else?

[MC4X4]

Ford explorer disc brakes,they dont work on tj dana 44s because the beating is smaller and they have made the stud pattern different..they bolt up on cjs ,you just need to change the stud pattern on the disc.I run them on my cj and they work realy well.MC

[MC4X4]

I will start again .Ford explorer brakes will bolt onto an amc 20 axle anad a cj dana 44 axle.You just have to change the stud pattern on the disc and maybe enlarge the cetre hole for the 2pc axles.They wont bolt onto a tj dana 44 because they run a smaller bearing and the mount up stud pattern is different.MC