"Thanks for everyones reply. I posted the original question because every now and then someone mentions putting juice brakes on a STOCK Model A. I've always thought the brakes Henry put on A's that are properly rebuilt, work just fine."
There are also those folks who don't / "can't" leave anything exactly the way the factory built it...
( I wonder what percentage of Harley's stay exactly the way they left the factory...? )
I would add a small qualifying statement to: "Stock brakes are just fine on a Model A" - a STOCK Model A...
If someone goes and substantially boosts the HP of their "banger" or re-powers the car with a hotter engine, then the Model A brakes may no longer be adequate.
My personal opinion is, that unless you're building a "heritage rod", and need to stay "old-school" with the Lockheed Juice brakes, if you really need hydraulic brakes, there are better hydraulic brake designs out there.
Chrysler Corp. finally gave up on Lockheed-derived brakes after the 1962 full-size cars. From then on, they used Bendix brakes. The "new" compact MoPars used Bendix brakes from day one, 1960 ( just like the Falcon & Comet).