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68 AMX Disc Brakes |
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68AMXJoe
AMC Apprentice Joined: Dec/30/2020 Location: Tampa// Status: Offline Points: 157 |
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I found some spacers (approx. 1/8") and put them on calipers fit a bit better but still scrape the outside edge, It appears they will need to be ground down? I am going to go back to my original drum brakes for now. Will try and tackle it at a later date.
Thank you all for the help.
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mbwicz
Supporter of TheAMCForum Joined: Feb/20/2019 Location: Buffalo, NY Status: Offline Points: 1983 |
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So they are hitting on the round part of the wheel rather than the face of the wheel? Which wheels are you using?
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1970 AMX, one step forward, one step back. Both steps cost time and money.
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68AMXJoe
AMC Apprentice Joined: Dec/30/2020 Location: Tampa// Status: Offline Points: 157 |
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14X6 rallies , magnums
Edited by 68AMXJoe - May/14/2022 at 4:52am |
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Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3759 |
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If you have a true 1968 disc brake setup, there are two stamped steel spacers - I think they go under the spindle? About .06" thick each. I can't remember if they're also on drum brake cars. And I can't remember if they go against the upright or behind the spindle.
IIRC there was a change in the caliper mounting bracket in ~1969 that eliminated these spacers. |
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3b-amcya
AMC Fan Joined: Jul/24/2010 Status: Offline Points: 13 |
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Hello everyone, I'm jumping on this post since it is so recent and I have a related question for 69 AMX stock rotors. I have the front end disassembled and the suspension rebuild 95% complete. I am looking at the stock rotors and would like to know the standard thickness and how much can be machined off if I have them turned. I don't want to go with aftermarket replacement (ST 127.63049) if I can avoid it. Those listed online show a thickness of 0.507" for new ST 127.63049 rotors. My original rotors are now at a thickness of .... get this 0.390" too funny! Can these be machined down any further or not? I can probably cleanup and live with them as is but would like to get them turned for smoother braking.
Thanks in advance. Brian 69 AMX 390 ... owned since 1990
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6756 |
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Original are 0.450" minimum. As memory serves, there was not many times you could turn these. It was always a good idea in the day to use soft pads as the metallic ones ate the rotors down below minimum with one pad change.
I know people hate ceramic pads, but on expensive rotors, they are likely the best way to go now.
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11468 |
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Your rotors are too thin. Find different ones! |
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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3b-amcya
AMC Fan Joined: Jul/24/2010 Status: Offline Points: 13 |
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Thanks for getting back to me. If I were to upgrade to the new rotors does anyone have experience with pressing in new studs? I am also concerned about potential runout. Any feedback on that and how to prevent it would be greatly appreciated. I suppose the local machine shop could do this for me instead of turning the olde ones.
Thanks again.
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6756 |
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If you find new rotors, pressing in studs is not really a problem.
If you don't have a press, you can set the rotor in a vise, use a big C-clamp and deep socket and press in studs. They will square up themselves in the holes as long as you don't start them on an angle.
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mbwicz
Supporter of TheAMCForum Joined: Feb/20/2019 Location: Buffalo, NY Status: Offline Points: 1983 |
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The original rotors have a spacer on them. If you are using the original wheels, it is important that you remove the spacer and mount it on the new rotor. The spacer is held on by the knurl of the studs.
There are threads here if you need to search for the proper studs (knurl diameter and length). This is also the opportunity to replace the studs with longer ones if you are using aftermarket wheels. Don't plan on reusing the old studs. Mike
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1970 AMX, one step forward, one step back. Both steps cost time and money.
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