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Leaky master cylinder |
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jeremy0711 
AMC Addicted 
Joined: Dec/12/2008 Location: Southern IN Status: Offline Points: 1547 |
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 Topic: Leaky master cylinderPosted: Oct/01/2014 at 8:26pm |
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Does anyone else have this issue? I cannot get this thing to stop leaking from the lid. I even swapped rubber seals, lids, retaining spring, and master cylinders. I have all of my buddy's stumped. I don't remember having this issue ever. I have already had to paint the engine bay once and now it is needing it again. Could the distribution block with the switch for the brake light be bad and causing this issue? I rebuilt it a few years ago and got the light off on the dash. It just came back on when I installed the FAST controller and got the car running again. It seems to be leaking more now.
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68-73 amx
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Joined: Jun/14/2012 Location: Pa. Status: Offline Points: 532 |
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Posted: Oct/02/2014 at 7:05pm |
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Yea, old and new always leaked.I thought it was from rapid starts & stops..
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Kapptaink
AMC Addicted
Joined: Mar/16/2009 Location: ElizabethtownKY Status: Offline Points: 595 |
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Posted: Oct/02/2014 at 7:19pm |
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Mine only starts leaking at the booster every 4yrs. The master lid seals great. 70 power drum.
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  PrevOwned:73HornetX 360/a727 Blk/Blk-69Javelin/R/R-69AMXBlk/W-69JavelinPrimerKirk |
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jeremy0711
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Joined: Dec/12/2008 Location: Southern IN Status: Offline Points: 1547 |
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Posted: Oct/02/2014 at 9:12pm |
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I am about to do some serious work on the master cylinder. If I have to take that thing off again then I'm gonna weld a nut in the center and bolt it down. It is gonna be a bitty to paint that shock tower with a 600 lb engine 4 inches away now. It has literally stripped paint down the metal this time. Before it was softening the paint and peeling behind the wiring. Now it is just peeling paint everywhere under it.
I was wondering if that block is backing up the least pressured side up through the master and blow out the top. Am I making up crap in my head. The only thing bad on my brakes is that switch that just went bad again and the master cylinder leaking. |
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uncljohn
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Joined: Jan/03/2013 Location: Peoria AZ Status: Offline Points: 5394 |
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Posted: Oct/02/2014 at 9:40pm |
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The only time I have had leaking problems,the lid was a poor quality stamping and reforming the lid with a new gasket was what it took to cause it to quit.
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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Kapptaink
AMC Addicted
Joined: Mar/16/2009 Location: ElizabethtownKY Status: Offline Points: 595 |
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Posted: Oct/03/2014 at 7:28am |
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get a detail air brush gun kit from harbor freight. that work great in tight spots.
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PrevOwned:73HornetX 360/a727 Blk/Blk-69Javelin/R/R-69AMXBlk/W-69JavelinPrimer Kirk |
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rocklandrambler
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Joined: Feb/09/2013 Location: Nanuet, NY Status: Offline Points: 3953 |
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Posted: Oct/03/2014 at 8:16am |
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Do the brakes seem to work OK other than the leak? It sounds to be like a pressure problem where the fluid is being forced out the top instead down one of the brake lines.
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Past AMC's
1974 Hornet X (new) 1975 Gremlin X (new) 1964 Classic 660 Cross Country 1965 American 440-H |
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jeremy0711
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Joined: Dec/12/2008 Location: Southern IN Status: Offline Points: 1547 |
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Posted: Oct/03/2014 at 10:35pm |
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The brakes work great. No issues there. I had to rebuild or clean up everything basically. I am stumped. I even had a local brake shop rebuild an original master cylinder too. No change. I think I am gonna stop by that shop on monday and see what he says. He has been doing brakes for atleast 40 years. That mess ruins my engine bays appearance. This car has been a thorn in my back ever since I got it.
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68-73 amx
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Joined: Jun/14/2012 Location: Pa. Status: Offline Points: 532 |
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Posted: Oct/03/2014 at 10:55pm |
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Why would pressure to build under the lid,blocked or plnched brake line,stuck wheel cyclinder?
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69 ambassador 390
Supporter of TheAMCForum 
Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539 |
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Posted: Oct/04/2014 at 8:44am |
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Lap the top of the master cylinder flat with a stone. Also replace the bail with an original or re-bend the one you have to be tighter. the replacements are usually way too loose. New gaskets are often thinner.
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Steve Brown
Algonac, Mi. 69 Ambassador sst 390 84 Grand Wagoneer 69 Cougar XR7 65 Fairlaine 500XL 79 F-350 Super Camper Special |
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