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post #1 of (permalink) Old 06-30-2002, 09:42 PM Thread Starter
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AMC HD 20 Brake question

Do any or all of the HD 20s use 11" drums? I know where there is one I could probably get the backing plates off of. If they are I'll be swapping them on the CJ. Thanks.

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post #2 of (permalink) Old 07-01-2002, 06:32 AM
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Re: AMC HD 20 Brake question

[img]images/icons/smile.gif[/img] Yep.......they DID have 11" brakes on some of the models. I THINK[img]images/icons/crazy.gif[/img] that '78 and earlier had 11" brakes. We are in the process of installing 11" brakes on our '79 CJ with the Model 20 rear axle.[img]images/icons/tongue.gif[/img]
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post #3 of (permalink) Old 07-01-2002, 09:15 AM
 
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Re: AMC HD 20 Brake question

my 81 from a wag has 11x2 drums.

IM converting to disk if you need any of teh backing plates, or rotors ive got em.

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post #4 of (permalink) Old 07-01-2002, 09:16 AM
 
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Re: AMC HD 20 Brake question

Are you talking the HD AMC 20 found in the back of a FSJ? The brakes are 11x2.
Not sure if the end of the housing is the same or not.
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post #5 of (permalink) Old 07-01-2002, 09:18 AM
 
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Re: AMC HD 20 Brake question

Hey OZ,
What are you using to convert the rear of the wag to disks? TSM kit?
I have an 82 Cherokee that I would like to do the same with.
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post #6 of (permalink) Old 07-01-2002, 09:25 AM
 
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Re: AMC HD 20 Brake question

weld on caliper brackets from AA mfg ( 6.50 each) and rotors from a 86 chevy truck, and typical gm front calipers ( same as waggys)

right around $100 for all, but no parking brake.

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post #7 of (permalink) Old 07-01-2002, 10:51 AM
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Re: AMC HD 20 Brake question

Hey Ozark,

You may want to save those backing plates. I cut the center out of mine to make a shim for the bearing retainer. If you don't use the backing plates, you will have to make a shim out of similar material.

Later,
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post #8 of (permalink) Old 07-01-2002, 12:24 PM
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Re: AMC HD 20 Brake question

[img]images/icons/smile.gif[/img] Oz could also use the cast-off backing plates from the small brakes that we take off the CJ's. The centers are the same.[img]images/icons/tongue.gif[/img]
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post #9 of (permalink) Old 07-01-2002, 02:33 PM
 
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Re: AMC HD 20 Brake question

culd you not use 4 washers Tom?

either way thanks for the heads up!

thats why I havent thrown it all away yet, I figured Id over look, alot of things!

did you get your Master cylinder/ fluid problem licked yet Tom?

I scrapped my cj's original axle before I got a chance to verify if they were the same, but from memory I was thinking they were!
thanks for the positive ID there Dave!
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post #10 of (permalink) Old 07-01-2002, 04:55 PM
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Re: AMC HD 20 Brake question

I guess you could use washers, but I wouldn't. The backing plate makes a continuous ring around the bearing. When you bolt on the retainer it applies pressure around that ring and on the bearing. If you only used washers there would be gaps around the bearing. I used the bearing plate as a template, and cut out the backing plate's center with a jig saw. Took less than 10 minutes for both, and I didn't have to buy any materials.

Later,
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