Kelsey Hayes Disc Brake Upgrade Question

John Martin said

It is my understanding that all disc brake cars built December 31, 1969 and before use the two piece valve system.

1st and 2nd pics

All disc brake cars built January 1, 1970 or later use a one piece valve system where both parts of the old system are basically Siamesed into a larger part.

3rd pic

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can't vouch for the change over date but the earlier years did have the 2 separate parts.

stock in 67 on front disc cars is 10x1.75 rear drum. 9" rear drum just won't have the rear stopping power of the 10", but my guess is you will not notice it.

with manual brakes you will never launch yourself through the windshield. You might brake the front seat back off but that's about it!

As long as you use all the correct parts for the same year (with regard to the 1 or 2 piece distribution valve and proportioning valve) you will have a bolt on. Since you have a 70 I would use those parts as it would be the most bolt on AND future parts purchases will be easier. The calipers are the same for the KH years so it matters not that they came from a 69