Rear brake hum/squeak

[Bluebird]

Rear right squeaks and hums only in iast 10-feet when stopping, I can hear warped drum I did not replace or turn cause drum too warn, but smooth, glazed? I sanded with emery cloth, start squeaking in first miles.
Oh yeah, it locks up on hard braking or panick stop. Hmmm, what y'all think I can do? Is it dangerous, or can I wait till next brake replacement & do it efficiently like I did the LHS with new drum? Truck my daily driver 24-miles, plus 40 to 75 miles. Thank you, Blessings to all! Patrick

 

[AnonEd]

Almost every first gen I've driven will lock one rear brake (a spooled truck was the exception). My theory is as long as one rear axle shaft is turning, so is the ring gear tone ring, so the antilock system doesn't see one brake locked. Danger level is probably relative...it's better than having a front lock and the rear brakes don't contribute much when my truck is empty.