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Pgh Ultramatic wrote:
Yes but there is a proportion of master cylinder volume and wheel cylinder effective area that needs to be maintained so that the master cylinder has enough fluid to extend the wheel cylinders, yet they can back off sufficiently when the brake is released.

Though, since the brake springs pull the cylinders "in" when brake pressure is off, I don't think you could easily get past the baseline "off" position in the wheels, so there would never really be enough fluid in the master to extend them all.

Pgh Ultramatic wrote:
What I find a little odd is that the BTV was the same for both Clipper and Packard so running the Clipper rear cylinders shouldn't be a problem, in that regard. Perhaps someone put fronts on all 4 wheels.

Ross wrote:
Your car should have 1 1/8 in the front and 1" in the rear. That automatically gives the correct braking proportion between front and rear to prevent rear wheel skids.

I am guessing that someone installed the small cylinders on the front which would greatly reduce your braking power. You will know soon enough when you get a chance to look

Also want to underline that when adjusting your rear brakes, make certain that the e-brake system is not holding the shoes away from the anchor pins. That really diminishes the effectiveness of the self servo action built into the system. Might want to drop a steel scale in your drums and make sure they are not more than .06" over 12" dia. Thin drums fade quickly.