Topic: 67 Brake Distribution Block Question

[Shawn]

I have quite a few distribution blocks for 67.  Is there a specific one used on disc brake application or is it the same as manual drum?

[67gtasanjose]

The short answer is that all the brake lines are different. The distribution block is mounted in a different hole, fittings are different, disc brakes have a residual valve back by the rear differential among other subtle differences.
I suggest looking closely at your donor vehicle, at these details I mentioned. ADD IN that there are EARLY versions and LATER versions that can complicate your parts list needed to do a correct conversion.

[jwc66k]

I suggest looking closely at your donor vehicle, at these details I mentioned. ADD IN that there are EARLY versions and LATER versions that can complicate your parts list needed to do a correct conversion.

The location change of the proportioning valve from the rear by the axle to the front at the distribution block was roughly in May, 1967.
Look in this Forum's Library in "ConcoursMustang.com Official 67 Mustang Article List" for a link to the 75 edition of "Ford Car Parts" (aka MPC) in the illustrated section on brakes, note the Ford base numbers and then review the service numbers in the test section. Part numbers are your friend.
Jim

[Shawn]

Yes I'm familiar with the early vs late versions and the prop valve at the rear.  Regardless I'm purchasing all lines etc. for the later 67 version version.  My only open issue is the front brass distribution block with the low pressure switch.  Were these different for the disc cars?

[67gtasanjose]

Yes I'm familiar with the early vs late versions and the prop valve at the rear.  Regardless I'm purchasing all lines etc. for the later 67 version version.  My only open issue is the front brass distribution block with the low pressure switch.  Were these different for the disc cars?

Back to Jim's answer:

The location change of the proportioning valve from the rear by the axle to the front at the distribution block was roughly in May, 1967.
Look in this Forum's Library in "ConcoursMustang.com Official 67 Mustang Article List" for a link to the 75 edition of "Ford Car Parts" (aka MPC) in the illustrated section on brakes, note the Ford base numbers and then review the service numbers in the test section. Part numbers are your friend.
Jim

I haven't CONFIRMED this with the MPC but I believe all 67's WITHOUT A FRONT RESIDUAL VALVE, used the same distribution block. It's only purpose is to work as a pressure differential valve with a switch for a Brake Failure Lamp (as well as a junction for the front brake lines). Engineering wise, it would serve the same purpose. I don't know if the mounting bracket differs though, hence the suggestion to CONFIRM this answer in the MPC.
NOTE: I've never done a disc brake CONVERSION so I can mostly only speak to my knowledge of what is on my factory disc brake, November 1966 example.

[Bob Gaines]

The change from rear to front on the proportioning valve probably varied depending on assemblyline plant. For instance I have seen June built SJ 67 Shelbys that had the proportioning valve in the back. That is very late in 67 production and it still had it in the rear.  I have not encountered a 67 Shelby which is what I typically examine that had the valve mounted in the front originally.

[67gta289]

For the front brass distribution block (2B257):

For drum brakes there was a early (very early, pretty early, pick your poison) version C7ZZ-2B257-A, and then the rest of the model year C7ZZ-2B257-B.  I don't recall reading anything about this running change.

The disc brake distribution block is different than the drum - service part number C7ZZ-2B257-D. 

The actual switch is a one year only part used on all Ford (did not check L-M) 1967 models, C7AZ-2B264-A

[J_Speegle]

For drum brakes there was a early (very early, pretty early, pick your poison) version C7ZZ-2B257-A, and then the rest of the model year C7ZZ-2B257-B.  I don't recall reading anything about this running change.

The disc brake item is different - C7ZZ-2B257-D.

+1 Not aware of any change in the disc brake valve and location during 67 production. 

Guess its back to the distribution block

we do have an older thread on the running change as far as the routing of the front brake lines as the associated lines but don't think it touched on the block

[S412gofast]

From West Coast Classic Cougar website https://secure.cougarpartscatalog.com/

Disc vs. Drum
https://cdn.cougparts.com/dc/C7ZZ-2B257-C/C7ZZ-2B257-C_vs_D_difference-1028.jpg


Brake line install for Disc
https://cdn.cougparts.com/dc/C7ZZ-2B257-D/C7ZZ-2B257-D_Diagram-1028.jpg

Brake line install for Drum
https://cdn.cougparts.com/dc/C7ZZ-2B257-C/C7ZZ-2B257-C_Diagram-1028.jpg

[67gtasanjose]

From West Coast Classic Cougar website https://secure.cougarpartscatalog.com/

Disc vs. Drum
https://cdn.cougparts.com/dc/C7ZZ-2B257-C/C7ZZ-2B257-C_vs_D_difference-1028.jpg


Brake line install for Disc
https://cdn.cougparts.com/dc/C7ZZ-2B257-D/C7ZZ-2B257-D_Diagram-1028.jpg

Brake line install for Drum
https://cdn.cougparts.com/dc/C7ZZ-2B257-C/C7ZZ-2B257-C_Diagram-1028.jpg

Using the images available at these links, it would appear the difference is in the SIZES of various fittings, so not interchangeable as the MPC demonstrates (thanks guys for the supporting information).
*pictures from the links attached for reference
*thanks WCCC for use of your website images, it speaks volumes.

The rebuild seal kits are the same, I wonder if the internal piston is the same.

The MPC is showing an early/late version for drum brakes but I didn't catch any identifying details (yet).

[RoyceP]

Back to Jim's answer:
I haven't CONFIRMED this with the MPC but I believe all 67's WITHOUT A FRONT RESIDUAL VALVE,

Never heard of a residual valve on any 1967 or 1968 Mustang. It does not exist. What are you talking about?

[67gta289]

the residual valve is an alternate moniker for the proportioning valve.  My Mopar friend uses that term all the time.

[RoyceP]

the residual valve is an alternate moniker for the proportioning valve.  My Mopar friend uses that term all the time.

That's not true. It sounds like you are confused.

[67gta289]

Never heard of a residual valve on any 1967 or 1968 Mustang. It does not exist. What are you talking about?

Looks like we were both confused.

I looked at the Ford documentation and the residual check valve is a component inside of the master cylinder, and is not akin to the proportioning valve.  Sorry for any confusion.

[RoyceP]

Looks like we were both confused.

I looked at the Ford documentation and the residual check valve is a component inside of the master cylinder, and is not akin to the proportioning valve.  Sorry for any confusion.

I knew that and was never confused about it.