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Is this an original equipment A12 master cylinder

dan juhasz

dan juhasz

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Is this a correct oe a12 master? The reason I question it is the difference of brake fluid chamber size. I would have expected 2 equal size chambers for drum drum.
@Big D A12


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Dan ,
Drum / Drum I S equal size chambers — as you expected…

That is a Front Disc / Rear Drum Master Cylinder — as you expected….

I can’t see enough of the Master Cylinder , in the pix , to tell you if it is 1967 - 1970 versus 1971 - 1973….

A couple more pix , I will tell you instantly…..

Craig…
 
mobileparts said:
Dan ,
Drum / Drum I S equal size chambers — as you expected…

That is a Front Disc / Rear Drum Master Cylinder — as you expected….

I can’t see enough of the Master Cylinder , in the pix , to tell you if it is 1967 - 1970 versus 1971 - 1973….

A couple more pix , I will tell you instantly…..

Craig…
Click to expand...
Is that the date code on the top flange 1168 ?
 
I am not 100 % sure on that —- perhaps someone else will chime in on that….

I thought that Most ( I don’t want to dare say “ ALL “ !!! ) MOPAR Date Codes were three ( 3 ) digits —-
For example : “ 468 “ would be 46th week of 1968 …..
But that might be on electrical and so forth…..

BENDIX ( U.S.A. BENDIX , back in the day ) had the contract with MOPAR for all Brakes related items ( hence , they were “ O.E.M. “ ) may have had their own codes —- and “ 1168 “ could well stand for “ November ( 11th month ) of 1968 “ …..

There are No catalogs or reference guides on all that , it is only what we have learned ,etc., etc. in these last 60 years ,
And of course, the MOPAR engineers and technicians from those days , who we could “ ask “ are all passed away !!!

Craig…
 
I am a little late to this thread Dan. Yes, the 1168 is a date code. I need to follow up as to the representation, 116th day of 1968 or 11/6/68. The other way to determine if this is a period correct cylinder for the A12 is the assembly date code on the nose of master cylinder. We have that range well documented.

D
 
Big D A12 said:
I am a little late to this thread Dan. Yes, the 1168 is a date code. I need to follow up as to the representation, 116th day of 1968 or 11/6/68. The other way to determine if this is a period correct cylinder for the A12 is the assembly date code on the nose of master cylinder. We have that range well documented.

D
Click to expand...
I will look for the date thanks Darrin
 
mobileparts said:
Dan ,
Drum / Drum I S equal size chambers — as you expected…

That is a Front Disc / Rear Drum Master Cylinder — as you expected….

I can’t see enough of the Master Cylinder , in the pix , to tell you if it is 1967 - 1970 versus 1971 - 1973….

A couple more pix , I will tell you instantly…..

Craig…
Click to expand...
Incorrect info . No Mopar disc brake master cyl ever had a bolt down lid like the one Dan posted * exception is the single pot system on 1966 and older systems

The one shown IS a 1967-1970 Drum brake master cylinder.
1971 and later used a lid hold down bale wire like the disc brake MC does.

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Last edited:
Big D A12 said:
I am a little late to this thread Dan. Yes, the 1168 is a date code. I need to follow up as to the representation, 116th day of 1968 or 11/6/68. The other way to determine if this is a period correct cylinder for the A12 is the assembly date code on the nose of master cylinder. We have that range well documented.

D
Click to expand...
Not a perfectly clear stamp
T27?7

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2737 = January 24, 1969. 4 - 6 weeks prior to actual build date is common. To answer your question, yes, this a period correct master cylinder for your A12 but a little early. Based upon this assembly date, I believe the casting date is 11/6/68.

D
 
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