Topic: 66 Running Change Survey Thread - Disc Brake Master Cylinder

[J_Speegle]

We discussed this feature earlier in another thread and the subject came up (related to San Jose production) on another site so wanted to extend the research to or members and include what data we could add to what I'm assembling.  Same "rules" as the other surveys

 This thread is posted to collect data related to disc brake master cylinders originally used during 1966 production

- This is ONLY for 1966 Mustangs!!

- Participants need to  provide the

a) cars VIN (you can leave off the last two numbers if you choose to keep it private) This will provide us with plant and sequential number

b) the projected build date from the original door/warranty tag unless you are offering date from a Shelby of course

c) if you can access it the date code from the master cylinder would be really helpful. A mirror or some play-doy will do the trick.

d) if you have loose master cylinders from the 66 production period those findings with a date code can still be very helpful

e) lastly which style it is.


- Look for features or clues of the part possibly being replaced. Mounting bolts, sound deadener...

I've already gone through some of my pictures building up a list and what appears to be the change over point at one plant but wanted as much data as we can collect to help with the determination.

Again thanks for your time

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Example of the earlier style that required a fitting/adapter




Example of the later style that required no fitting/adapter






Example of the location of the date code. in this case 4-6  ( April of 66)

[sgl66]

From my Metuchen car scheduled build date Oct 14 6T09K12****

Hard to see in the picture but it has the adapter

[J_Speegle]

Thanks. I guess an side benefit of this discussion may be the two different dating patterns

[sgl66]

Thanks. I guess an side benefit of this discussion may be the two different dating patterns

Even though 205 is July 24, my guess is that someone figured out during production that there is room for 3 characters only which would present a problem when you get to the months with 2 digits. Obviously more samples would help

[J_Speegle]

Even though 205 is July 24, my guess is that someone figured out during production that there is room for 3 characters only which would present a problem when you get to the months with 2 digits. Obviously more samples would help

Using the Julian calendar style three digits would be all that is needed since you would only need a max of 365/366 .  For others the Julian calendar "decoder" is on the last pages of the date coding article in the Library

Found a couple more early (65's like the 205 numbered one here) outside. Need to capture their dates and keep an eye open for a few more at the swap meet tomorrow

[ChrisV289]

Jeff,

This is off my dad's Shelby. I believe I provided you the full Ford vin once before. Shelby is 1502. Let me know if these are ok or you need something else. Car was restored in the late 1990's.

[AU SNK]

66 Metuchen, NJ  6T09C2435XX April 15th. The lid has most likely been cleaned a few to many times.

[Bob Gaines]

66 Metuchen, NJ  6T09C2435XX April 15th. The lid has most likely been cleaned a few to many times.

The lid is typically painted black. It was painted along with the master cylinder body as a unit .

[Bob Gaines]

My 65/66 studies are concentrated at the San Jose plant. All of the historical photos I have seen with cars from that plant show the gold lid painted black (gold on bottom side based on survivor car examination). I can't say with a certainty that the other plants followed suit but given the units used at the other plants were also Bendix master cylinders it is reasonable to assume that they did.   

[J_Speegle]

.............The lid has most likely been cleaned a few to many times.

+1 Its been reported that the master cylinders with lids in place arrived at each of the assembly plants fully painted with plugs in both of the ports to protect the threads and keep contamination out. Plus any small amount of brake fluid used to lube the piston from leaking out

[1966KGT]

11/08/65 build date, 6R09K129XXX, 65K miles, 268 date code, has adapters, appeared painted, sent to white post for restoration. Did appear to be gold somewhat on bottom of cap. 2225032 on btm.  makers mark and the #4.

[J_Speegle]

11/08/65 build date, 6R09K129XXX, 65K miles, 268 date code, has adapters, appeared painted, sent to white post for restoration. Did appear to be gold somewhat on bottom of cap. 2225032 on btm.  makers mark and the #4.

Thanks - Fits thew pattern

Caps were typically seen plated by zinc dichromate

[jwc66k]

My disc brake master cylinder is installed and it's difficult to read the script in a mirror, but there is script in the center and under both cap retainer strap areas. The fluid lines do have an adapter. 6R09K121xxx, 18 Oct 65 build.
Jim

[J_Speegle]

Thanks - Added to the spreadsheet.

[hertz350]

Which style of MC would be expected on a mid-March San Jose car with serial number range of 175xxx?

Thank you.