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68 AMX Disc Brakes

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68AMXJoe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 68AMXJoe Quote  Post ReplyReply Direct Link To This Post Topic: 68 AMX Disc Brakes
    Posted: May/13/2022 at 12:03pm
Here I am again....!!!  Bought a disc brake set up with the whole front end off of a 68 AMX. My wheels 14 inch will not fit!!! Calipers hit/scrape on the wheel. He had large wheels on his.???? They are attached to the original trunion frontend. How is it possible?
     Joe
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mbwicz Quote  Post ReplyReply Direct Link To This Post Posted: May/13/2022 at 12:30pm
  Is it a factory disc setup that you installed?  The factory cars with discs had an 1/8" spacer between the rotor and wheel, so that the calipers don't hit the inside of the wheel.  Maybe this spacer is missing on your setup?
  This would be the case if the caliper is hitting the back of the wheel face.  If the caliper is hitting the round part of the wheel, that is more difficult to solve.

Mike
1970 AMX, one step forward, one step back. Both steps cost time and money.
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68AMXJoe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 68AMXJoe Quote  Post ReplyReply Direct Link To This Post Posted: May/13/2022 at 12:38pm
I did not get the spacer from the person I bought them from. Can I still find them or even a 1/4 would do.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mbwicz Quote  Post ReplyReply Direct Link To This Post Posted: May/13/2022 at 1:03pm
The original studs are pretty short, that is the only reason that I would be worried about running a 1/4" spacer.  I would put an ad in the 'wanted' section, chances are someone has a set that they would sell.

Mike


Edited by mbwicz - May/13/2022 at 1:05pm
1970 AMX, one step forward, one step back. Both steps cost time and money.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve_P Quote  Post ReplyReply Direct Link To This Post Posted: May/13/2022 at 1:54pm
Factory wheels?
IIRC, the disc / wheel spacers were not .12 thick, maybe .06-.09. But they were required for the Magnum 500 wheels
  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzzman72 Quote  Post ReplyReply Direct Link To This Post Posted: May/13/2022 at 1:55pm
Back in the early '70s, I sold a couple of sets of Cragar wheels for AMCs. The Cragar catalog specified to use their "disc brake spacer" on cars with disc brakes. So using a spacer on cars with disc brakes was common back in the day, say, prior to about '75 when discs became NEARLY universal on V8 cars.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BU1 Quote  Post ReplyReply Direct Link To This Post Posted: May/13/2022 at 2:05pm
Originally posted by 68AMXJoe 68AMXJoe wrote:

Bought a disc brake set up with the whole front end off of a 68 AMX.
 
 Original 68 style parts? Solid rotors?? 4 piston calipers??
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#1 1968 AMX Rally Green 343 Z code 4spd since 1975 #02642
#2 1968 AMX Rally Green 290 N code 4spd since 2019 #02959
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblinrev Quote  Post ReplyReply Direct Link To This Post Posted: May/13/2022 at 2:12pm
If you bought the new casting calipers (4 piston Bendix style), with the original Magnum 500 wheels, they MAY scrape a bit, as some have reported they needed to do a little grinding on the caliper for clearance. (The originals had just the bare minimum clearance back in the day.)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: May/13/2022 at 3:02pm
Find a couple of scrap top hat rotors and grind the tops off for 1/8" spacers. Toyota, Honda, Ford, Chrysler  ... 4.5x5/114.3x5 are all the same. Just find ones that the center hole clears. If you cut the top off from the side, and clean down to flat, there will be no balance issues. 
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THE MENACE View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote THE MENACE Quote  Post ReplyReply Direct Link To This Post Posted: May/13/2022 at 5:43pm
I just checked some OE spacers that I have, and they are .084 thick. 

As others said above "they were needed for the OE Magnum 500 wheels to fit properly on 4 piston OE Bendix disc brakes" 

Dennis  
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