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Master Cylinder Problems #3077257
09/14/22 03:28 PM
09/14/22 03:28 PM
Joined: Jan 2003
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North Dakota
6PakBee Offline OP
master
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The master cylinder on my '67 Belvedere is leaking like the Missouri river. Four wheel manual drum application. The M/C has the four studs that go through the firewall with the nuts on the passenger compartment side. I can't find ANY replacement M/C's, even NOS ones that have the studs. Do I have to remove the studs from the old M/C and install them in the new one? The '67 FSM does not address this at all. The '67 parts book does not show a listing for the studs as a separate item. In fact, the photo in the parts book for the manual setup shows the pedal bracket that the studs go through, and the M/C, but no studs in the M/C. Can anyone shed some light on this?


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Re: Master Cylinder Problems [Re: 6PakBee] #3077260
09/14/22 03:47 PM
09/14/22 03:47 PM
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Grand Prairie,Texas
stumpy Offline
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Can you rebuild your old one? It isn't hard if you can find a kit.

Re: Master Cylinder Problems [Re: stumpy] #3077262
09/14/22 03:55 PM
09/14/22 03:55 PM
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New York, USA
Chargerfan68 Offline
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Yes….i’ve pressed out the old studs and instalked them on the new m/c on many occassions.


1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
Re: Master Cylinder Problems [Re: stumpy] #3077265
09/14/22 04:04 PM
09/14/22 04:04 PM
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North Dakota
6PakBee Offline OP
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Originally Posted by stumpy
Can you rebuild your old one? It isn't hard if you can find a kit.


What I'm worried about is that it's the piston seal at the input end that is leaking. When I've encountered this before, the combination of brake fluid and atmosphere has corroded the bore to the point that it's junk. But I'm going to pull the M/C tomorrow and see what the bore condition looks like.


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Re: Master Cylinder Problems [Re: Chargerfan68] #3077266
09/14/22 04:05 PM
09/14/22 04:05 PM
Joined: Jan 2003
Posts: 9,868
North Dakota
6PakBee Offline OP
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Originally Posted by Chargerfan68
Yes….i’ve pressed out the old studs and instalked them on the new m/c on many occassions.


That's what I needed to know! I have a rebuild kit on the way but if that route proves unworkable, I think Mr. Press will be my friend! Thanks again. up


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Re: Master Cylinder Problems [Re: 6PakBee] #3077284
09/14/22 05:48 PM
09/14/22 05:48 PM
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Posts: 1,820
Harriman NY
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71GTX471 Offline
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Have the MC professionally rebuilt & the cyl. sleeved.

Re: Master Cylinder Problems [Re: 71GTX471] #3077289
09/14/22 06:10 PM
09/14/22 06:10 PM
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Posts: 1,222
North Carolina
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469runner Offline
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North Carolina
Originally Posted by 71GTX471
Have the MC professionally rebuilt & the cyl. sleeved.
This is the best solution. I've used this company near Winchester Va. with success on several occasions. It will last longer than we will. https://whitepost.com/brake-sleeving-rebuilding-services/

Re: Master Cylinder Problems [Re: 469runner] #3077382
09/14/22 11:49 PM
09/14/22 11:49 PM
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Posts: 9,868
North Dakota
6PakBee Offline OP
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I found NOS M/C's with a Google search. If mine is unrebuildable, I think I will go with NOS and transfer the studs.


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Re: Master Cylinder Problems [Re: 6PakBee] #3077607
09/15/22 05:48 PM
09/15/22 05:48 PM
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North Dakota
6PakBee Offline OP
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Well, I got it out this afternoon and yes, it has serrated head studs. I honed the bore a bit and it cleaned up really well. I think a kit will make it.

1967 Manual Drum Brake MC-1.JPG

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Re: Master Cylinder Problems [Re: 6PakBee] #3077647
09/15/22 07:34 PM
09/15/22 07:34 PM
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Grand Prairie,Texas
stumpy Offline
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up

Re: Master Cylinder Problems [Re: stumpy] #3077781
09/16/22 10:42 AM
09/16/22 10:42 AM
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Western Md.
skicker Offline
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Fwiw...The studs will tap out easily with just a small hammer it the rebuild doesn't work for whatever reason...


...FAFO...
Re: Master Cylinder Problems [Re: skicker] #3077858
09/16/22 02:47 PM
09/16/22 02:47 PM
Joined: Jan 2003
Posts: 9,868
North Dakota
6PakBee Offline OP
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Thanks to all who helped. up


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Re: Master Cylinder Problems [Re: skicker] #3078082
09/17/22 11:49 AM
09/17/22 11:49 AM
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Posts: 17,245
north of coder
moparx Offline
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Originally Posted by skicker
Fwiw...The studs will tap out easily with just a small hammer it the rebuild doesn't work for whatever reason...



i did just that when i replaced the master on my buddy's 70 super bee.
it was an original drum brake car, but i converted it to discs.
the original drum master was a 1" bore, but i put a 1 1/32" bore master on it when doing the conversion.
it stops 10 times better now !
beer

Re: Master Cylinder Problems [Re: moparx] #3078208
09/17/22 07:57 PM
09/17/22 07:57 PM
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Omaha Ne
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TJP Offline
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Omaha Ne
Originally Posted by moparx
Originally Posted by skicker
Fwiw...The studs will tap out easily with just a small hammer it the rebuild doesn't work for whatever reason...



i did just that when i replaced the master on my buddy's 70 super bee.
it was an original drum brake car, but i converted it to discs.
the original drum master was a 1" bore, but i put a 1 1/32" bore master on it when doing the conversion.
it stops 10 times better now !
beer


FYI: it would do even better with a 1" bore or smaller but would require a tiny bit more pedal travel wink beer

Re: Master Cylinder Problems [Re: TJP] #3078344
09/18/22 09:58 AM
09/18/22 09:58 AM
Joined: Sep 2003
Posts: 17,245
north of coder
moparx Offline
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you are correct. however when the swap occurred, he had already purchased everything, so i just installed it.
i told him if it were me, i would have gone with a 15/16 [i am a wimp] or 1" master.
after the swap was made, he was super happy on how good it stopped he didn't want to change anything, so i left it as it was.
beer

Re: Master Cylinder Problems [Re: moparx] #3078419
09/18/22 12:25 PM
09/18/22 12:25 PM
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Omaha Ne
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Originally Posted by moparx
you are correct. however when the swap occurred, he had already purchased everything, so i just installed it.
i told him if it were me, i would have gone with a 15/16 [i am a wimp] or 1" master.
after the swap was made, he was super happy on how good it stopped he didn't want to change anything, so i left it as it was.
beer


mymain reason for commenting was so that others would be aware of the differences wink
up beer

Re: Master Cylinder Problems [Re: TJP] #3078434
09/18/22 12:47 PM
09/18/22 12:47 PM
Joined: Sep 2003
Posts: 17,245
north of coder
moparx Offline
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north of coder
one of the best stickies on here is the "feets brake article". up bow boogie
a mandatory read for anyone wanting to do brake work, other than just replace components.
commenting is a great way to remind others who do not know, [me grin] as well as reminding those who have forgotten. [me again biggrin]
beer

Re: Master Cylinder Problems [Re: moparx] #3078452
09/18/22 01:16 PM
09/18/22 01:16 PM
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Omaha Ne
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Omaha Ne
Originally Posted by moparx
one of the best stickies on here is the "feets brake article". up bow boogie
a mandatory read for anyone wanting to do brake work, other than just replace components.
commenting is a great way to remind others who do not know, [me grin] as well as reminding those who have forgotten. [me again biggrin]
beer

Could you point me to it, i have a friend that may benefit from it wink

Re: Master Cylinder Problems [Re: TJP] #3078455
09/18/22 01:21 PM
09/18/22 01:21 PM
Joined: Sep 2003
Posts: 17,245
north of coder
moparx Offline
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it's in the handling section, sticky at the top.
"everything you ever wanted to know about disc brakes" [or something like that] from member FEETS.
beer







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