First, having run shops and owned them, never, as in ever, use an air hose to blow out drums or backing plates on OLD cars with OLD brakes.
I evacuated a shop once, many moons ago, and waited until it cleared out, when one of my moron workers decided to mount a 1-ton rear drum on the lathe and blow it out.
Old brakes have asbestos on them.
If you don't care, fine with me, but brake and clutch asbestos allegedly got Steve McQueen.
That said, when we started using non-asbestos linings, we found older cars without power assist would not stop, even with two feet on the brake pedal.
I take the shoes down to our local brake reliner and have what they call "A-B" linings installed, and the 60-year-old cars stop like new.
Might be that.
The bigger US cars (like said 2010 Shove-it) are SUBSTANTIALLY heavier than your little frog eye, and they NEED the brake area and assist to even think about stopping.