Topic: "Early" 1967 Brake Proportioning Valve?

[sah62]

Has anyone seen a proportioning valve that looks like this used on 1967 Mustangs assembled prior to (approximately) February 1967? If so, I'm trying to learn if it is marked with an engineering number and if it was used on any other vehicles.

[ruppstang]

I have never seen a proportion valve like that used on any 67. The early 67s proportion valve was located in the back of the car just ahead of the flex hose.
Marty

[67gta289]

Scott,

I have not seen that on any original cars. I've only seen cylindrical types - before, during, and after 1967.

I can say that in 1980 when my Dec 66 SJ Mustang developed a leak in the typical cylindrical 2B091-B version, I went to the Ford dealer to by one, and one that externally looks the same as the one you pictured.  In the box was a new shorty brake line. 

I just rebuild my original (glad I saved it) with a kit I bought from you last week.  I still have the 1980 version out in the garage and will add pictures later on.

By the way having a heck of a time getting the piston out of the distribution block (the one that drives the low level sensor).  The grease gun will be next.

John

[67gta289]

Here are the pictures.  Still have the box from 1980

[J_Speegle]

Here is one installed on a car from the 114-115xxx period

[krelboyne]

Have seen that one on 1968 and 1969's.

[preaction]

Here is one installed on a car from the 114-115xxx period

So Jeff, this type did come on some 67 cars ?

[J_Speegle]

So Jeff, this type did come on some 67 cars ?

That is what that picture is of. Not sure if it was all early or certain application at this point

[Bob Gaines]

That is what that picture is of. Not sure if it was all early or certain application at this point

Do you know if power drum or disc brake?

[ruppstang]

How do we know it was original to the car and not a replacement such as in John's case?

[sah62]

Scott,

I have not seen that on any original cars. I've only seen cylindrical types - before, during, and after 1967.

I can say that in 1980 when my Dec 66 SJ Mustang developed a leak in the typical cylindrical 2B091-B version, I went to the Ford dealer to by one, and one that externally looks the same as the one you pictured.  In the box was a new shorty brake line. 

I just rebuild my original (glad I saved it) with a kit I bought from you last week.  I still have the 1980 version out in the garage and will add pictures later on.

By the way having a heck of a time getting the piston out of the distribution block (the one that drives the low level sensor).  The grease gun will be next.

John

Thanks for the thoughts, everyone. I'm pretty sure this is a service part that replaced the cylindrical version at some point. I need to do some more research to see if I can find the engineering number(s) associated with the C7OZ-2B091-B service part number.

John, if you need some help with the grease gun, read this: https://www.musclecarresearch.com/grease-gun-pressure

[ruppstang]

I use a propane torch and heat the block pretty hot. The old O ring and oil get very soft, then I hit it against a block of wood and the piston comes right out.
Marty

[67350#1242]

Check 67 shop manual section 2  part 2-2  fig. 20 - Brake system Comet Fairlane Falcon.   Shows the valve labeled as disc brake alternate only.
I once owned a 67 GTA that had one of these plumbed into the normal rear position brake line - worked just fine as far as I could tell.

[J_Speegle]

Do you know if power drum or disc brake?

Unfortunately no front spindles on that example - though the cap on the master cylinder suggest disc. So really confusing since we have seen hundreds if not more power disc cars from the early part of the year without this item

Did look up the part number in a 67 MPC and its listed - application Fairlanes and Mustangs  - w/power brake booster . No additional information no application date. The base number showed another (approx) 10 other parts using that base number for different applications

Another angle of the same part and car

[sah62]

It turns out that there are three different engineering numbers associated with the C7OZ-2B091-B service part number:

• C7OA-2B091-A (believed to be the 1967 cylindrical version)
• C7OA-2B091-C (believed to be the 1968 cylindrical version)
• C9OA-2B091-A (believed to be the 1969 cylindrical version)

I also see a reference to a C7OA-2B091-B engineering number, but I don't have anything to confirm seeing that number stamped on any cylindrical valves. Has anyone seen it "live"?

Still no clues to an engineering number for this replacement part, though.