Author Topic: "Early" 1967 Brake Proportioning Valve?  (Read 663 times)

Offline ruppstang

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #15 on: February 28, 2017, 08:28:42 PM »
Do you know if power drum or disc brake?

IMHO it would have to be a disc car because the is no reason for a proportion valve on a power drum brake car, the pressure is the same front and back.

Offline Bob Gaines

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #16 on: February 28, 2017, 08:52:31 PM »
IMHO it would have to be a disc car because the is no reason for a proportion valve on a power drum brake car, the pressure is the same front and back.
I was trying to understand a reason for use . Given that the 67 ,68 ,and 69/70 use virtually the same proportioning valve I am at a loss to understand why it looks so different. Most other Ford brass assemblys like brake lines,typical proportioning valves ,distribution blocks etc. are metal stamped with engineering number in the brass . Maybe after market?
Bob Gaines,Shelby enthusiast, Shelby collector , Shelby concours judge SAAC,MCA,Mid America Shelby

Offline sah62

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #17 on: February 28, 2017, 09:19:45 PM »
...and the mystery deepens. I have personally seen the C9OA-2B091-A engineering number on a cylindrical valve. Take a look at the attached picture and help me understand how the same engineering number might appear on a very different part!

Bob, it may look different as a function of Ford trying to reduce the number of service parts that could be used across car lines. The full-sized A-line cars (Galaxie etc.) used a proportioning valve that looks a lot like this one. Maybe Ford decided to make this part the service part for F-line cars, too.
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Offline Bob Gaines

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #18 on: February 28, 2017, 09:25:30 PM »
...and the mystery deepens. I have personally seen the C9OA-2B091-A engineering number on a cylindrical valve. Take a look at the attached picture and help me understand how the same engineering number might appear on a very different part!

Bob, it may look different as a function of Ford trying to reduce the number of service parts that could be used across car lines. The full-sized A-line cars (Galaxie etc.) used a proportioning valve that looks a lot like this one. Maybe Ford decided to make this part the service part for F-line cars, too.
That my be it. It wouldn't be the first time Ford did that, make another part that fits a variety of applications that is.
« Last Edit: February 28, 2017, 09:28:32 PM by Bob Gaines »
Bob Gaines,Shelby enthusiast, Shelby collector , Shelby concours judge SAAC,MCA,Mid America Shelby

Offline sah62

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #19 on: February 28, 2017, 09:44:55 PM »
OK, one thing is for sure - with a C9 engineering number this isn't a part designed for use during the 1967 model year.
Scott Hollenbeck
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Offline J_Speegle

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #20 on: February 28, 2017, 10:32:05 PM »
........... function of Ford trying to reduce the number of service parts that could be used across car lines. The full-sized A-line cars (Galaxie etc.) used a proportioning valve that looks a lot like this one. Maybe Ford decided to make this part the service part for F-line cars, too.

But that may not apply to the 67 part.

As for the C9 why wouldn't you just use the cylinder style part already in production as the service piece (smaller item that would fit in more spots) unless it was cheaper to make this odd ball shaped one.

Think we need to find some more bridges to reach the answer
Jeff Speegle

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Offline sah62

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #21 on: February 28, 2017, 11:04:49 PM »
Cheaper may be the answer, Jeff. The valves that appeared during the 1970 model year used the same basic internal parts as this block-shaped valve. It could be that this is what the manufacturers were moving to.

Keeping this on-topic to '67s, though: if folks could confirm the engineering numbers seen on cylindrical valves (pics would be nice, too) I'd greatly appreciate it.
Scott Hollenbeck
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Offline ruppstang

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #22 on: March 01, 2017, 09:54:28 AM »
There is a original with the part number.

Perhaps this design was developed because it was installed in the back of the car inline. The shape may not have been as important when it was moved under the distribution block. Just a possibility.

Offline sah62

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #23 on: March 01, 2017, 10:39:28 AM »
Thanks, that's a C7OA-C. Here's a cylindrical C9OA-A. Does anyone have a picture of a C7OA-A or C7OA-B?
Scott Hollenbeck
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Offline J_Speegle

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #24 on: March 01, 2017, 02:35:49 PM »
Just a thought

If this odd shaped one was meant to be a replacement  why is it designed and installed at the front (in the engine compartment)  and what takes the place of the one in the rear , since there is no additional fittings or item to take up the gap

Surely if there is a problem with the original factory (if that is what is going on) the idea was not to leave it in place once it was replaced by the other
Jeff Speegle

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Offline krelboyne

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #25 on: March 01, 2017, 08:49:16 PM »
I saw a huge clue that it can be a service replacement, in the photo of the instruction sheet for the NOS valve:

This valve is shaped different than valve it replaces ..... and requires the new included brake lines for Fairlane / Montego, Falcon / Comet.

1967- 1969 Mustang / Cougar - Form existing brake lines to accommodate new valve.

I have 3 examples of what I call the 'Texas' shaped control valve. Mine all show: SURF 315-7 or (166-7, 088-5) X-2B328-BB. My guess is that the 315-7 is the Julian Date followed by the year? 1967 and 1975?

We mostly have examples of the C7OA-2B091-C and C9OA-2B091-A. No other casting numbers found. IMHO, I believe that the date code is year,month,day.

For C7OA-2B091-C, I found BA20,BE26,BK09,BL29,CA18,CA23,CA30,CB06,CG02,CG29,CK16.
For C9OA-2B091-A, I found JC21,JE08.
 
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Offline J_Speegle

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Re: "Early" 1967 Brake Proportioning Valve?
« Reply #26 on: March 01, 2017, 10:46:30 PM »
I saw a huge clue that it can be a service replacement, in the photo of the instruction sheet for the NOS valve:

This valve is shaped different than valve it replaces ..... and requires the new included brake lines for Fairlane / Montego, Falcon / Comet.

1967- 1969 Mustang / Cougar - Form existing brake lines to accommodate new valve.

Yes would think that you found the smoking gun. Still I have wonder how they addressed the gap (if you removed the factory valve) at the rear


I have 3 examples of what I call the 'Texas' shaped control valve. ...........

Very descriptive - like it
Jeff Speegle

Anything worth doing is worth doing concours ;)