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70 AMX combination valve |
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3250man 
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Joined: Jun/14/2019 Location: WA Status: Offline Points: 286 |
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 Topic: 70 AMX combination valvePosted: Apr/02/2020 at 7:14pm |
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Yeah, at first I used a small drill bit (Chuck-side in the hole), then used a punch. Felt like it got “stuck.” I saw the spring you mentioned in the musclecarrebuild article (under - autopsy).
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1974 Mellow Yellow N-code AMX (restoring)- "Steve"
2016 Chevy Colorado (RIPP supercharged V6) 1973 Corvette 1974 Trans AM Red P-code AMX |
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Bill F
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Joined: Feb/21/2017 Location: Maryland Status: Offline Points: 244 |
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Posted: Apr/02/2020 at 4:32pm |
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Sorry that didnt work. Hopefully you can get it rebuilt.
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Bill Frazer
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Bernie70AMX
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Joined: Mar/16/2008 Location: Pennsylvania Status: Offline Points: 80 |
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Posted: Apr/02/2020 at 4:03pm |
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Just was working on mine today, Used pin punch in small end pushed it out big end. There is another spring in there I do not see in your photo. Had to hit it pretty hard to remove. there is smaller spring also on end of bigger spring.
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Bernie70AMX
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3250man
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Posted: Apr/02/2020 at 12:34pm |
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Bill F, Thanks for the info. I made a bit of progress but I think I'm turning in the towel. Don't want to damage the innards any more than what I have so far. The brass piece is stuck in the metering valve side so I cant remove any if its guts and I cant get the pressure differential switch piston out. Big help was the musclecarresearch.com article. I saw a post by TX390AMX about rebuilding these. I'll send him a PM and see if mine's a candidate. Jim  |
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1974 Mellow Yellow N-code AMX (restoring)- "Steve"
2016 Chevy Colorado (RIPP supercharged V6) 1973 Corvette 1974 Trans AM Red P-code AMX |
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Bill F
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Joined: Feb/21/2017 Location: Maryland Status: Offline Points: 244 |
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Posted: Apr/01/2020 at 11:19am |
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Might have to go both ways. I've used the same idea to move hydraulic pistons, wheel cylinders, and calipers.
When it comes loose it's basically a projectile so have a rag or block of wood there. Protect your eyes andhands.
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Bill Frazer
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3250man
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Posted: Mar/31/2020 at 11:15pm |
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OK, so which end do I apply the air pressure: #1 or #2? This thing is stuck!
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1974 Mellow Yellow N-code AMX (restoring)- "Steve"
2016 Chevy Colorado (RIPP supercharged V6) 1973 Corvette 1974 Trans AM Red P-code AMX |
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3250man
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Posted: Mar/26/2020 at 6:33pm |
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Thanks, I’ll give it a go.
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1974 Mellow Yellow N-code AMX (restoring)- "Steve"
2016 Chevy Colorado (RIPP supercharged V6) 1973 Corvette 1974 Trans AM Red P-code AMX |
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Bill F
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Joined: Feb/21/2017 Location: Maryland Status: Offline Points: 244 |
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Posted: Mar/26/2020 at 6:21pm |
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Mine came apart easily but if its stuck you can try compressed air. Works well on calipers and wheel cylinders. Cover the open end with a rag to catch the piston. Dont want to turn it into a projectile.
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Bill Frazer
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3250man
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Posted: Mar/26/2020 at 4:09pm |
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First of all, I did my due diligence search and arrived at the (what I believe) correct name: the brake combination valve. '74 AMX, disc front brakes, drum rear.
Next, how do you remove the innards of #1? The nut is loose and I can see a small gap. Saw one YouTube video and the guy said to soak it (mine's been there for a day) and he used a punch and a hammer at location #2. At around $120-$150, I don't relish busting my valve. I did order one of the rebuild kits from MCR. Any help appreciated.  |
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1974 Mellow Yellow N-code AMX (restoring)- "Steve"
2016 Chevy Colorado (RIPP supercharged V6) 1973 Corvette 1974 Trans AM Red P-code AMX |
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White70JavelinSST
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Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4866 |
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Posted: Feb/14/2020 at 9:34am |
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This link will get you to the site that the link in the above post won't madams, there's one too many https:// in your link, when you use the link icon highlight the https:// in the window and delete it first, then paste the link in.
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70 Javelin SST, second owner, purchased 1972
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