Previous Thread
Next Thread
Print Thread
Master Cylinder Problems #3077257
09/14/22 04:28 PM
09/14/22 04:28 PM
Joined: Jan 2003
Posts: 10,667
North Dakota
6PakBee Offline OP
I Live Here
6PakBee  Offline OP
I Live Here

Joined: Jan 2003
Posts: 10,667
North Dakota
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?


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: Master Cylinder Problems [Re: 6PakBee] #3077260
09/14/22 04:47 PM
09/14/22 04:47 PM
Joined: Jan 2003
Posts: 32,884
Grand Prairie,Texas
stumpy Offline
I Win
stumpy  Offline
I Win

Joined: Jan 2003
Posts: 32,884
Grand Prairie,Texas
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 04:55 PM
09/14/22 04:55 PM
Joined: Oct 2006
Posts: 1,263
New York, USA
Chargerfan68 Offline
pro stock
Chargerfan68  Offline
pro stock

Joined: Oct 2006
Posts: 1,263
New York, USA
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 05:04 PM
09/14/22 05:04 PM
Joined: Jan 2003
Posts: 10,667
North Dakota
6PakBee Offline OP
I Live Here
6PakBee  Offline OP
I Live Here

Joined: Jan 2003
Posts: 10,667
North Dakota
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.


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: Master Cylinder Problems [Re: Chargerfan68] #3077266
09/14/22 05:05 PM
09/14/22 05:05 PM
Joined: Jan 2003
Posts: 10,667
North Dakota
6PakBee Offline OP
I Live Here
6PakBee  Offline OP
I Live Here

Joined: Jan 2003
Posts: 10,667
North Dakota
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


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: Master Cylinder Problems [Re: 6PakBee] #3077284
09/14/22 06:48 PM
09/14/22 06:48 PM
Joined: Jan 2003
Posts: 1,888
Harriman NY
7
71GTX471 Offline
top fuel
71GTX471  Offline
top fuel
7

Joined: Jan 2003
Posts: 1,888
Harriman NY
Have the MC professionally rebuilt & the cyl. sleeved.

Re: Master Cylinder Problems [Re: 71GTX471] #3077289
09/14/22 07:10 PM
09/14/22 07:10 PM
Joined: Jan 2004
Posts: 1,248
North Carolina
4
469runner Offline
pro stock
469runner  Offline
pro stock
4

Joined: Jan 2004
Posts: 1,248
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
09/15/22 12:49 AM
09/15/22 12:49 AM
Joined: Jan 2003
Posts: 10,667
North Dakota
6PakBee Offline OP
I Live Here
6PakBee  Offline OP
I Live Here

Joined: Jan 2003
Posts: 10,667
North Dakota
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.


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: Master Cylinder Problems [Re: 6PakBee] #3077607
09/15/22 06:48 PM
09/15/22 06:48 PM
Joined: Jan 2003
Posts: 10,667
North Dakota
6PakBee Offline OP
I Live Here
6PakBee  Offline OP
I Live Here

Joined: Jan 2003
Posts: 10,667
North Dakota
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

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: Master Cylinder Problems [Re: 6PakBee] #3077647
09/15/22 08:34 PM
09/15/22 08:34 PM
Joined: Jan 2003
Posts: 32,884
Grand Prairie,Texas
stumpy Offline
I Win
stumpy  Offline
I Win

Joined: Jan 2003
Posts: 32,884
Grand Prairie,Texas
up

Re: Master Cylinder Problems [Re: stumpy] #3077781
09/16/22 11:42 AM
09/16/22 11:42 AM
Joined: Jun 2005
Posts: 5,097
Western Md.
skicker Offline
"The Champ"
skicker  Offline
"The Champ"

Joined: Jun 2005
Posts: 5,097
Western Md.
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 03:47 PM
09/16/22 03:47 PM
Joined: Jan 2003
Posts: 10,667
North Dakota
6PakBee Offline OP
I Live Here
6PakBee  Offline OP
I Live Here

Joined: Jan 2003
Posts: 10,667
North Dakota
Thanks to all who helped. up


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: Master Cylinder Problems [Re: skicker] #3078082
09/17/22 12:49 PM
09/17/22 12:49 PM
Joined: Sep 2003
Posts: 19,239
north of coder
moparx Online content
"Butt Crack Bob"
moparx  Online Content
"Butt Crack Bob"

Joined: Sep 2003
Posts: 19,239
north of coder
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 08:57 PM
09/17/22 08:57 PM
Joined: Jan 2003
Posts: 15,197
Omaha Ne
T
TJP Offline
I Live Here
TJP  Offline
I Live Here
T

Joined: Jan 2003
Posts: 15,197
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 10:58 AM
09/18/22 10:58 AM
Joined: Sep 2003
Posts: 19,239
north of coder
moparx Online content
"Butt Crack Bob"
moparx  Online Content
"Butt Crack Bob"

Joined: Sep 2003
Posts: 19,239
north of coder
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 01:25 PM
09/18/22 01:25 PM
Joined: Jan 2003
Posts: 15,197
Omaha Ne
T
TJP Offline
I Live Here
TJP  Offline
I Live Here
T

Joined: Jan 2003
Posts: 15,197
Omaha Ne
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 01:47 PM
09/18/22 01:47 PM
Joined: Sep 2003
Posts: 19,239
north of coder
moparx Online content
"Butt Crack Bob"
moparx  Online Content
"Butt Crack Bob"

Joined: Sep 2003
Posts: 19,239
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 02:16 PM
09/18/22 02:16 PM
Joined: Jan 2003
Posts: 15,197
Omaha Ne
T
TJP Offline
I Live Here
TJP  Offline
I Live Here
T

Joined: Jan 2003
Posts: 15,197
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 02:21 PM
09/18/22 02:21 PM
Joined: Sep 2003
Posts: 19,239
north of coder
moparx Online content
"Butt Crack Bob"
moparx  Online Content
"Butt Crack Bob"

Joined: Sep 2003
Posts: 19,239
north of coder
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







Powered by UBB.threads™ PHP Forum Software 7.7.1