If its like the chevelles,  its pretty easy.  you just need all the master and lines and distribution block from a 67.  i think i have a block and the lines up to the master cyl for a fullsize pontiac you can have.  remind me next time.

You may need to change to a 1/4 inch line going to the rear if yours is 3/16(thats how chevelles are.).  and the fittings for the lines are some funky sizes but i have lots of those too, or you can buy them from inlinetube.

I did a fulsize conversion on my cousins 65 impala,  used all junkyard parts from a 67.  I seem to remember there being a large square hole in the firewall that i had to make a small blockoff plate for,  other than that i dont recall there being any issues with the pushrods as long as its all manual brakes.    his might have had a booster we removed too, and went back to manual brakes, thus the big hole

beaumontguru wrote:

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You may need to change to a 1/4 inch line going to the rear if yours is 3/16(thats how chevelles are.).  and the fittings for the lines are some funky sizes but i have lots of those too, or you can buy them from inlinetube.

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 I may have some of those oddball fittings/nuts too and if not I think the dealership has them in an assortment.

I've heard guys say you need to run a 1/4" line to the back. Why is that if the rear cylinders are still the same as they were before?

You will be using the same manual pedal clevis hole you're using now with the new dual manual master. The bolt spacing should be the same on the master body. Understand that manual masters have the smaller diameter piston. The original 3/16 line to the rear will be fine.

That all I can offer on this,

Ya,  was atleast 10 years ago when i did the 65,  i know we did change to teh 1/4 line because teh distribution block was that size going to the rear,  then changed the rear hose, or actually i think we just got an adapter fitting.

The rear line is 3/16 on my 65. Did they go to 1/4 in 66?

What I did was run a new line from the dual master rear, to a female 3/8 inverted flare union onto the old rear line. Just bent the old line upward to meet the new line.

Took that old original T junction, drilled a new bracket bolt hole on the frame, and turned it 90° (on the same axis), blocked what used to be the old right side line outlet and made a new small line to the left brake hose bracket. Used the old right side line as is.

 

I turned the T block 90°, owing to what was though to be flow issues in its original configuration. You could find a new T that you need not block, but it probably won't have the bracket.

Worked well. And looks fairly factory but for the union in the rear line.

https://canadianponcho.activeboard.com/t66506981/brake-line-t-fitting-question/

I'll keep that in mind but I am not so sure I need it. I suspect I can use the existing line to the back. Thanks, I'll let you know. And I don't know if/when I will ever do this. First comes the diff swap, the engine swap, add the rear sway bar etc. And so far in retirement I haven't even worked on my car!

No, front is front.

Thanks, I haven't checked yet what I have here but I think I have those pieces. If not, I can get Dorman locally very easy.

One more question, did you retain the cylinder pushrod from the single cylinder or is it the one from the dual setup. I didn't check in the parts book, maybe they are even the same?

And I'm assuming that rod will have some adjustment in it also.

Off track a bit, although the description is a little confusing, it looks like Independent front and rear brakes (dual master?) were available in 66 as Chevrolet special equipment.