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Trader 
AMC Addicted 
Joined: May/15/2018 Location: Ontario Status: Offline Points: 6913 |
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 Posted: Jul/29/2020 at 10:00pm |
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For the MC DO NOT send it off. It's not rocket science to rebuild one, but it's very difficult to replace an original. Find a local shop, even if it's a couple of hours drive, and hand it to them to rebuild and pick it back up when they are done.
You give it to the major auto parts places and they send it with dozens of others to be rebuilt. You get back what ever comes off the pile that matches the closest and will do - as far as they are concerned. If they have to put plugs in one side and machine the opposite side for line fitting, they just do it. You could be getting a Ford, GM ???? back.
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mbwicz
Supporter of TheAMCForum 
Joined: Feb/20/2019 Location: Buffalo, NY Status: Offline Points: 2001 |
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Posted: Jul/30/2020 at 4:56am |
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A quick check to see if the pushrod is too long is to add a washer between the master cylinder mounting flange and the booster it mounts to. This will move the MC away from the booster by the thickness of the washer.
This is not a long term solution, just a way to see if the pushrod is preventing the return of the fluid. If the problem goes away, then get a tool to adjust the pushrod length and you should be good. Be aware that you will likely notice the difference when you drive with the washer in place, the pedal will be lower. Again, just a temporary method and not a long term solution. A messy way to confirm that the fluid is not being able to return to the MC is to loosen the front brake fitting at the MC when the brakes are dragging. If there is pressure in the line, then the issue is the MC (check valve or piston not at the 'home' position). If there is not pressure in the line, then either the hose is holding the pressure in the caliper or the caliper is mechanically binding. Just remember that brake fluid strips paint, so be careful to clean any that sprays or drips. Good luck, Mike |
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1970 AMX, one step forward, one step back. Both steps cost time and money.
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akimmet
AMC Nut
Joined: Aug/02/2012 Location: Republic OH Status: Offline Points: 428 |
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Posted: Jul/30/2020 at 10:09am |
I also do not recommend sending in an original core to a parts store re-builder, you likely won't get your correct core back. Find someone local to rebuild the master cylinder if at all possible. Bad hoses can indeed cause all of the problems you described. Usually this only happens to really old hoses. However; due to experience, I no longer implicitly trust new parts to not be bad or dirty out of the box.
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72_AMX
AMC Apprentice 
Joined: Jul/16/2019 Location: Somerville, Al Status: Offline Points: 69 |
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Posted: Jul/30/2020 at 3:32pm |
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Thanks. I will try the washer this weekend and post a follow-up. Also thanks for the advice on the MC rebuild. I was worried about getting my booster back.
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being Alive is not the same as Living
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tomj
AMC Addicted
Joined: Jan/27/2010 Location: earth Status: Offline Points: 7555 |
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Posted: Jul/30/2020 at 10:36pm |
Oooh, nice trick! Of course! Space it out too much, no big deal (for testing). In fact you could probably stack up shims to work out exactly how much too long the current one is, shim it to "perfect", measure the stack of shims and find/make a rod that much shorter. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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Fluffy73
AMC Addicted
Joined: Nov/21/2007 Location: Castlegar, BC Status: Offline Points: 3059 |
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Posted: Jul/31/2020 at 1:57am |
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Many master cylinders have adjustable push rods.
I guess the easiest test would be simply separate the master cylinder from the booster. If the brakes release, there's your problem. |
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I am genetically incapable of being Politically Correct.
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rockAMX
AMC Addicted
Joined: Sep/16/2011 Location: Lethbridge AB Status: Offline Points: 985 |
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Posted: Jul/31/2020 at 5:52pm |
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Also make sure you use shims to center each of the calipers on its rotor. If the caliper is off-center, the disk pad will make contact with the rotor.
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DWR
1968 AMX  |
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72_AMX
AMC Apprentice
Joined: Jul/16/2019 Location: Somerville, Al Status: Offline Points: 69 |
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Posted: Aug/10/2020 at 4:25am |
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Update. I tried the shims on the master cylinder and that did make the pedal correct however the brakes still drag. I ordered new brake hoses and will try that as soon as I can. Thanks everyone for the great help.
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being Alive is not the same as Living
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72_AMX
AMC Apprentice
Joined: Jul/16/2019 Location: Somerville, Al Status: Offline Points: 69 |
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Posted: Sep/19/2020 at 5:20am |
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Sorry it has taken so long to reply. Thanks for the info. I did order the tool from MP Brakes and the push rod was not set correctly. I also changed the Brake hoses and that has fixed the problem. Thanks for the help.
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being Alive is not the same as Living
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tomj
AMC Addicted
Joined: Jan/27/2010 Location: earth Status: Offline Points: 7555 |
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Posted: Sep/20/2020 at 10:59pm |
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Great to hear! It's nice to hear how problems get resolved!
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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72_AMX wrote: