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I used AMC 1969 used Rock Auto site look up under javelin they list ones for drum and disc brakes also list bore size My concerns were for outlets for lines to face out from frame when installed on frame . My adaptor uses the holes in frame the factory used to mount the single master cylinder.

acold's conversion was the one I was thinking about. Thanks!

To add to the AMC lineup of dual master cylinder:
My 1966 Rambler Classic 770 convertible has power drum brakes with a dual master cyl.
Steve

Thanks for all of the great info guys! I'm still trying to figure everything out in regards to parts. I'll either keep this thread updated or start a new one on the whole process.

-Chris

Still doing some research on this.

It appears that the manual master cylinder was mounted in front of the firewall down low on Ultramatic cars, and mounted behind the firewall underneath the floor on cars with a manual transmission.

Can anyone confirm this?

Thank you,

-Chris

MC was mounted just behind the steering gear on all manual brake cars through 56 unless it was a Torsion Level car with manual brakes. On those it was mounted under the floor because of clearance problems with the bars.

Am curious about what happens at the pedal side to accommodate the end mount type masters.

It would appear with mounting the setup in the original frame location the thickness of the bracket plus the extra distance needed to accommodate the widely spaced mounting ears of the new master, the center line of the assembly will be moved a good two inches or more inward from the original master. What was done at the pedal side pivot attachment point or to the push rod itself to move the cylinder side end of the rod so it can meet the piston center in a straight line?

Looking at a photo of the original master and how the rod comes thru an opening in the frame, there does not look to be a lot of room for rod position changes. Also, what happens to the bellcrank for the shift linkage?

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Not buying the kool aid here.

en.wikipedia.org/wiki/American_Motors_Corporation

Brake manufacturers made the masters not car companies. AMC did no direct parts manufacturing, they sourced all their items. They bought from different places in different years. So did Packard to some extent, like the bodies. If you ever owned a Jeep, you might have a Ford engine, GM trans, Essex wiring, Dana axles, Spicer gears, and lights from Grote, or someone else.
Wagner, Bendix, etc created the brake parts, owned the patents, and sold them to the car companies. Packard (post war) used Wagner as some of the others where owned or controlled by the big three.
This is not a task for someone that doesn't know brake systems. It's a safety system, so needs the right engineering. Volume and pressure must match the wheel cylinders. DOT controls part of the system, sets standards usually off SAE or other recommendations. Not saying it's not commonly done, but can lead to accidents if not done right. Get in touch with a certified mechanic.
If you look at the single castings, there's usually a second port cast but not drilled and tapped. The piston assembly has to change to operate two ports.

Chris, I had Ross Miller convert the Easamatic brake system on my 55 Clipper (non Torsion Level) to a conventional single master cylinder. All parts (pedal, cylinder, etc.) were from a pre-55 Packard. I was most pleased with the performance, smooth and efficient without much pedal pressure needed. Many non power brake Packard parts out there. I think you will like the change.

Quote:

Thank you Ross, that clears up a lot. I saw some manual masters were mounted both ways but thought the under the floor layout was with manual trans vehicles.

The plan is to mount a modern booster and dual circuit master under the floor like hotrodders do. In order to achieve this, I need the rod going towards the back of the car, not the front.

So, for what I'm trying to do, I think the 55+ manual setup would be best.

Does anyone know if the 55+ pedal setup would bolt onto a 54- frame?

I suppose I could always modify the bottom of a 54- pedal to make this work as well.

What do you guys think?

-Chris


Quote:

Thanks for the reply JWL. I have thought about going with only manual brakes, but aside from trying to get rid of the Treadle-Vac, I'm trying to upgrade to a dual circuit master cylinder.

As of now, it sounds like the only way I'm going to achieve this, is by mounting it under the floor like the 55+ cars. If I'm going to have to go through all that just to mount the dual circuit, I'm thinking adding a booster won't be too much more work.

With that being said, I thank you for your input because I haven't driven a Packard with manual brakes and was under the impression that it wouldn't be a pleasant experience. After your reply, if I can't make the booster work, I won't worry about it too much.

Thanks again!

-Chris