Power Disc Brakes not working on hard stop?

Post #8, imho
Most times a customer complained of similar, rear brakes were so loose, the whole master cylinder stroke goes to moving the shoes out to contact the drum. There can be no "pedal" till all pads/shoes are in contact with rotor/drum.
The m/c runs outta travel. (I know you think it shouldn't)
Pedal goes "bump"
Nothing has changed in 10 yrs, why would m/c pushrod change, plumbing didn't change, fluid levels up, bled.
Shoe wear is easiest to eliminate, piece of shoe coulda come off.
.jmo
Good luck