That's great hydraulic physics to know.
After I disconnect the brake line, I'm gonna' attach the pressure gauge to the end of the brake line & see if there is any decrease in the pressure at the wheel.
I'm a little skeptical that +/- 125 psi is enough pressure to effectively deploy the brake shoes, but this is my 1st Crosley rebuild, & I'll certainly accept
your experience in this matter.
Just for grins, I'll report back to you the psi reading.
Thanx so much for your advice.